Cornell University Department of Plant Breeding and Genetics

Education
Ph.D. University of Washington, 1988.
B.A. Swarthmore College, 1982.

Professional Overview
Rebecca Nelson is an associate professor of Plant Pathology, Plant Breeding and International Agriculture, and serves as Program Director for The McKnight Foundation Collaborative Crop Research Program. Through the CCRP, she supports a portfolio of research projects aimed at improving food security in developing countries in Asia, Africa and Latin America. Her research interests include molecular genetics and participatory approaches to disease and crop management. Her current research concerns resistance to diseases of cereal crops (especially maize) of importance to African food security. This work, which is affiliated with Cornell's Institute for Genomic Diversity, is aimed at understanding the molecular diversity of defense response genes and determining the roles defense genes in conditioning quantitative disease resistance. She contributes to courses in international agriculture and plant pathology. She worked at the International Potato Center (CIP) in Lima, Peru from 1996-2001 and at the International Rice Research Institute in the Philippines from 1988-1996.

Professional Experience

• 2003 Associate Professor, Plant Breeding and Genetics, Cornell University (joint appointment; retaining primary affiliation with Plant Pathology - Ithaca).
• Aug 2001 Associate Professor, Plant Pathology and International Agriculture, Cornell University.
• Mar 2001 Program Director, McKnight Foundation's Collaborative Crop Research Program, 4 March 2001 - present. Support and facilitation for a portfolio of 14 international projects; research on crop genomics and participatory research.
• Aug 1996 Molecular Pathologist, International Potato Center (CIP), August 1, 1996 - present. Research group conducts marker-assisted genetic analysis of the late blight pathosystem, and participatory research on late blight management.
• Project Leader, Integrated Control of Late Blight,
• CIP's largest and highest-priority project. Manage project involving 21 internationally-recruited staff.
• Sep 1993 Plant Pathologist, International Rice Research Institute, September 23, 1993 - July 31, 1996. Research group conducts marker-assisted genetic analysis of the rice blast and bacterial blight pathosystems, and participatory research on blast management.
• 1994-1996 Deputy Division Head, Entomology and Plant Pathology Division, 1994 to 1996.
• 1995-1996 Project Team Leader, Use of biodiversity for sustainable pest management, 1995 - 6.
• 1991-1996 Site coordinator, Upland Rice Consortium, IRRI site (Cavinti). 1991 - 1996.
• 1993-1996 Deputy Coordinator, Asian Rice Biotechnology Network. 1993 - 1996.
• 1989-1993 Associate Plant Pathologist, International Rice Research Institute, September 22, 1989 - September 22, 1993.
• 1989-1993 Secretary, IRRI Biotechnology Working Group, July 1989 - Jan. 1993.
• 1992-1993 Affiliate Faculty, Department of Plant Pathology/Weed Science, Colorado State University, July 1, 1992 to June 30, 1993.
• 1990-1996 Visiting Assistant Professor of Genetics, Institute of Biological Science, University of the Philippines Los Banos.
• 1996-1999 Editor, THEORETICAL AND APPLIED GENETICS, 1996 - 1999.
• 1995-1998 Associate Editor, PHYTOPATHOLOGY, 1995 - 1998.
• 1991-1996 Visiting Assistant Professor and Graduate Research Advisor, field of Molecular Plant Pathology, Department of Plant Pathology, University of the Philippines Los Banos, June 1, 1991 to 1996.
• 1988-1989 Postdoctoral Fellow, International Rice Research Institute, funded by the Rockefeller Foundation Program in Rice Biotechnology, February 1988 to September 1989. Research in the Plant Pathology Department in the laboratory of Dr. Hei Leung. Employing molecular techniques to study plant-pathogen interactions, and working toward cloning disease resistance genes from wild relatives of rice.
• 1984-1987 Predoctoral Trainee, Molecular and Cellular Biology Training Grant of the National Institutes of Health (US), 1984-1987. Competitive award to conduct research in the laboratory of Dr. Charles Laird, Department of Zoology, University of Washington. Used the methods of molecular biology, developmental biology and genetics to define and characterize the interactions between a target gene and two trans-acting regulators of gene expression.
• 1985-1987 Co-founder of the interdepartmental study group Science and Society, University of Washington, 1985-1987. Organized weekly readings and discussions on a variety of subjects concerning the applications of science and technology to problems of agriculture, natural resources and the environment.
• 1984 Independent Research Worker, Ministry of Agriculture, Managua, Nicaragua, October-December 1984. In collaboration with Dr. Alison Power (now of Cornell University), studied several aspects of the plant-insect vector-pathogen interaction involved in Corn Stunt Disease, including methods of culture and diagnosis of the Corn Stunt Spiroplasma, and the effect of cropping strategies on the movement of the insect vector.
• 1982 Research Assistant in the laboratory of Dr. Aubrey Gorbman, Summer 1982, University of Washington, Seattle, Washington. Studied developmental endocrinology of salmonid fishes.
• 1982-1985 Teaching Assistant, University of Washington, 1982-1985. Courses in Introductory Biology, Developmental Biology and Human Physiology (total of six terms).
• 1981 Research Assistant, University of California, Berkeley, USA, summer of 1981. Working with Dr. MB Saffo, studied relationship between a tunicate and its fungal endosymbiont.
• 1979-1982 Teaching Assistant, Swarthmore College, 1979-1982. Courses in Introductory Chemistry and Developmental Biology (total of three terms).
• 1979 Farm Assistant, fish farm (Tilapia), Alamosa, Colorado, USA, summer of 1979.
• 1980 Farm Laborer, fish farms (Tilapia/carp/mullet and trout) on Kibbutz Dan in Israel, summer/autumn of 1980.
  Professional Activities
  My interests and objectives, which are reflected in my affiliations at Cornell, relate to plant pathology and international agriculture. I serve as program director for The McKnight Foundation's Collaborative Crop Research Program (CCRP). This responsibility involves provision of support for a set of research projects aimed focusing on "orphan crops". Each project in the CCRP portfolio involves collaboration among researchers in developing countries and in advanced labs. At Cornell, my affiliations are with the plant pathology, international agriculture, rural sociology and plant breeding departments; as well as with the Institute for Genomic Diversity. My own research program is focused on understanding the ways in which plants defend themselves against pathogen attack, and on using this for practical disease management. My lab is currently working on two foliar diseases of maize that are important both in the U.S. and in Africa.

Selected Publications

International Journals
Andrade-Piedra, J., R. Hijmans, G. Forbes, W.E. Fry and R.J. Nelson. Simulation of potato late blight in the Andes. 1: Modification and parameterization of the LATEBLIGHT model. Submitted, Phytopathology.

Wisser, R.J., Qi, S., Kresovich, S., and R.J. Nelson. Identification and characterization of regions of the rice genome associated with broad-spectrum, quantitative disease resistance. In press, GENETICS.

Garry, G., A. Salas, G. Forbes, W. Perez, M. Santa Cruz, and R.J. Nelson. Host specialization not detected in isolates of Phytophthora infestans attacking wild and cultivated potatoes in Peru. In press, European J. Plant Pathology.

Ortiz, O., Garrett, K. A., Heath, J. J., Orrego, R., and Nelson, R. J. 2004. Management of potato late blight in the Peruvian highlands: Evaluating the benefits of Farmer Field Schools and Farmer Participatory Research. Plant Disease 88: 15-44.

Naylor, R.L., W. P. Falcon, R.M. Goodman, M.M. Jahn, T. Sengooba, H. Tefera, and R.J. Nelson. 2004. Biotechnology in the Developing World: A Case for Increased Investments in Orphan Crops. Food Policy 29(1): 15-44.

R.J. Nelson, R.L. Naylor, M.M. Jahn. 2004. The role of genomics research in improvement of "orphan" crops. Crop Science 44: 1901-1904.

Trognitz, F.C., P.M. Manosalva, D.O. Niño-Liu, Ma. del R. Herrera, M. Ghislain, B.R. Trognitz and R.J. Nelson. 2002. Plant defense genes associated with quantitative resistance to potato late blight in Solanum phureja x S. tuberosum hybrids. Mol. Plant-Microbe Interactions 15: 587-597.

Nelson, R.J., Orrego, R., Ortiz, O., Mundt, M., Fredrix, M. and Vien, N.V. 2001. Working with resource-poor farmers to manage plant diseases. Plant Disease 85: 684-695.

Perez, W.G., J.S. Gamboa, Y.V. Falcon, M. Coca, R.M. Raymundo and R.J. Nelson. 2001. Genetic structure of Peruvian populations of Phytophthora infestans. Phytopathology 91: 956-965.

Garrett, K.A., R.J. Nelson, C.C. Mundt, G. Chacon, R.E. Jaramillo, and G.A. Forbes. 2001. The effects of host diversity and other management components on epidemics of late blight in the humid highland tropics. Phytopathology 91: 993-1000.

Shanti, M.L., M.L.C. George, C.M. Vera Cruz, M.A. Bernardo, R.J. Nelson, H. Leung, J.N. Reddy and R. Sridhar. 2001. Identification of resistance genes effective against rice bacterial blight pathogen in Eastern India. Plant Disease 85: 506-512.

Vera Cruz, C.M., J. Bai, I. Ona, H. Leung, R.J. Nelson, T.W. Mew and J.E. Leach. 2000. Predicting durability of a disease resistance gene based on an assessment of the fitness loss and epidemiological consequences of an avirulence gene mutation. Proc. Natl. Acad. Sci. USA. 97(25): 13500-13505.

Kumar, J., R.J. Nelson, and R. S. Zeigler. 1999. Population structure and dynamics of Magnaporthe grisea in the India Himalayas. Genetics 152: 971-984.

Finckh, M. and R.J. Nelson. 1999. Phylogenetic and pathotypic analysis of bacterial blight race 3. European Journal of Plant Pathology 105 (8): 743-751.

Chen, D., M. dela Vina, T. Inukai, D.J. Mackill, P.C. Ronald and R.J. Nelson. 1999. Molecular mapping of the blast resistance genes, Pi44(t), derived from a durably resistant rice cultivar. Theoretical and Applied Genetics 98: 1046-1053.

Raymundo, A.K., A.M. Briones, E.Y. Ardales, M.T. Perez, L.C. Fernandez, J.E. Leach, T.W. Mew, M.A. Ynalvez, G.C. McLaren and R.J. Nelson. 1999. Analysis of DNA polymorphism and virulence in Philippine strains of Xanthomonas oryzae pv. oryzicola. Plant Disease 83: 434-440. [This paper received an award from the Philippines' Department of Agriculture Secretary during the 13th BAR Anniversary Celebration in Diliman, Quezon City, on 5 Oct. 2000]

George, M.L.C., R.J. Nelson, R.S. Zeigler, and H. Leung. 1998. Rapid population analysis of Magnaporthe grisea by using rep-PCR and endogenous repetitive DNA sequences. Phytopathology 88 (3): 223-229.

Zeigler, R.S., Scott, R.P., Leung, H., Bordeos, A., Kumar, J., and Nelson, R.J. 1997. Evidence of parasexual exchanges of DNA in the rice blast fungus challenges its exclusive clonality. Phytopathology 87: 284-294.

Kumar J., Sridhar R., Bentur J. S., Shanti M. L., Reddy J. N., Katiyar S.,George M. L. C., Bernardo M., Zeigler R. S., Nelson R.J., Bennett J. 1997. Collaborative research on understanding insect and pathogen diversity. In: proceedings of IRRI India Research Dialog, Indian Council of Agricultural Research, New Delhi.

George, M.L.C., M. Bustamam, W.T. Cruz, J.E. Leach, and R. J. Nelson. 1997. Movement of Xanthomonas oryzae pv. oryzae in Southeast Asia detected using PCR-based DNA fingerprinting. Phytopathology 87: 302 - 309.

Vera Cruz, C.M., E.Y. Ardales, D.Z. Skinner, J. Talag, R. J. Nelson, F.J. Louws, H. Leung, T.W. Mew, and J.E. Leach. 1996. Measurement of haplotypic variation in Xanthomonas oryzae pv. oryzae within a single field by rep-PCR and RFLP analyses. Phytopathology 86: 1352-1359.

Inukai, T., R.S. Zeigler, S. Sarkarung, M. Bronson, L.V. Dung, T. Kinoshita, and R.J. Nelson. 1996. Development of pre-isogenic lines for rice blast resistance by marker-aided selection from recombinant inbred population. Theor. Appl. Genetics 93(4): 560-567.

Ardales, E.Y., H. Leung, C.M. Vera Cruz, T.W. Mew, J.E. Leach, and R.J. Nelson. 1996. Hierarchical analysis of spatial variation of the rice bacterial blight pathogen across diverse agroecosystems in the Philippines. Phytopathology 86: 241-252.

Chen, D., R.S. Zeigler, S.W. Ahn and R.J. Nelson. 1996. Phenotypic characterization of the rice blast resistance gene Pi-2(t). Plant Disease 80: 52-56.

Chen, D.H., R.S. Zeigler, H. Leung and R.J. Nelson. 1995. Population structure of Pyricularia grisea at two screening sites in the Philippines. Phytopathology 85: 1011-1020.

Zeigler, R. S., L.X. Cuoc, R.P. Scott, M.A. Bernardo, D.H. Chen, B. Valent and R.J. Nelson. 1995. The relationship between lineage and virulence in Pyricularia grisea in the Philippines. Phytopathology 85(4): 443-451.

Adhikari, T.B., C.M. Vera Cruz, Q. Zhang, Q., R.J. Nelson, D.Z. Skinner, T.W. Mew, and J.E. Leach. 1995. Genetic Diversity of Xanthomonas oryzae pv. oryzae in Asia. Appl. Env. Microbiology: 61(3): 966-971.

Yoshimura, S., A. Yoshimura, S.R. McCouch, M.R. Baraoidan, T.W. Mew, N. Iwata and R.J. Nelson. 1995. Tagging and combining bacterial blight resistance genes in rice using RAPD and RFLP markers. Molecular Breeding 1: 375-387.

Naqvi, N., J.M. Bonman, D.J. Mackill, R.J. Nelson, and B.B. Chattoo. 1995. Identification of RAPD markers linked to a major blast-resistance gene in rice. Molecular Breeding 1: 341-348.

Leach, J.E., H. Leung, R.J. Nelson, and T.W. Mew. 1995. Population biology of Xanthomonas oryzae pv. oryzae and approaches to its control. Current Opinion in Biotechnology 6:298-304.

Nelson, R.J., M.R. Baraoidan, C.M. Vera Cruz, I.V. Yap, J.E. Leach, T.W. Mew, and H. Leung. 1994. Relationship between phylogeny and pathotype for the bacterial blight pathogen of rice. Appl. Environ. Microbiol. 60: 3275-3283.

Wang, G., D.J. Mackill, J.M. Bonman, S.R. McCouch, and R.J. Nelson. 1994. RFLP mapping of genes conferring complete and partial resistance to blast resistance in a durably resistant rice cultivar. Genetics 136: 1421-1434.

Inukai, T., R.J. Nelson, R.S. Zeigler, S. Sarkarung, D.J. Mackill, J.M. Bonman, I. Takamure, and T. Kinoshita. 1994. Allelism of blast resistance genes in near-isogenic lines of rice. Phytopathology 84 (11): 1278-1283.

Zeigler, R.S., E. Guico, R. Scott, and R. Nelson. Relationship between partial resistance of rice cultivars and their susceptibility to lineages of Pyricularia grisea. Submitted, Plant Disease.

Nelson, R.J. 1996. Marker-assisted plant breeding. In G.J. Persley (ed.), Biotechnology and Integrated Pest Management, CAB International, 475 pp.

Mazzola, M., J.E. Leach, R. Nelson, and F.F. White. 1994. Analysis of the interaction between Xanthomonas oryzae pv. oryzae and the rice cultivars IR24 and IR-BB21. Phytopathology 84: 392-397.

Leung, H., R.J. Nelson, and J.E. Leach. 1993. Population structure of plant pathogenic fungi and bacteria. Adv. Plant Pathol. 10: 157-205. Academic Press.

Borromeo, E.S., R.J. Nelson, J.M. Bonman, and H. Leung. 1993. Genetic differentiation among isolates of Pyricularia grisea infecting rice and weed hosts. Phytopathology 83: 393-399.

Bonman, J.M., G.S. Khush, and R.J. Nelson. 1992. Breeding rice for resistance to pests. Ann. Rev. Phytopath. 30: 507-528.

Amante-Bordeos, A., L.A. Sitch, R. Nelson, R. Dalmacio, N.P. Oliva, H. Aswidinnoor, and H. Leung. 1992. Transfer of bacterial blight and blast resistance from the tetraploid wild rice Oryza minuta to cultivated rice, Oryza sativa. Theor. Appl. Genet. 84: 345-354.

Aswidinnoor, H., R.J. Nelson, J.F. Dallas, C.L. McIntyre, H. Leung, and J.P. Gustafson. 1991. Cloning and characterization of repetitive DNA sequences from genomes of Oryza minuta and Oryza australiensis. Genome: 34: 790-798.

Nelson, R., G. Odell, A. Christiansen, and C. Laird. 1990. Hormonal control of gene expression: Interactions between two trans-acting regulators in Drosophila. Developmental Biology 144: 152-166.

Laird, C., E. Jaffe, G. Karpen, M. Lamb, and R. Nelson. 1988. Fragile sites in human chromosomes as late-replicating DNA. Trends Genet. 3: 274-281.

Saffo, M.B., and R. Nelson. 1983. The cells of Nephromyces: developmental stages of a single life cycle. Can. J. Bot. 61: 3230-3239.


Books, Chapters, Proceedings, Local Journals and Dissertation
Nelson, R., M. Palacios, R. Orrego, and O. Ortiz (technical editors). 2002. Guia Para Facilitar el Desarrollo de Escuelas de Campo: Manejo Integrado de las Principales Enfermedades e Insectos de la Papa. Caso San Miguel, Cajamarca, Peru. 264 pp. CIP-CARE, Lima, Peru. [A field guide for facilitators of farmer field schools in potato disease and insect management]

Naylor, R., R. Nelson, W. Falcon, R. Goodman, M. Jahn, J. Kalazich, T. Sengooba, and H. Tefera. Submitted. "Integrating New Genetic Technologies into the Improvement of Orphan Crops in Least Developed Countries." Paper prepared for the 6th International Conference on Agricultural Biotechnology: New Avenues for Production, Consumption and Technology Transfer, convened by ICABR (International Consortium on Agricultural Biotechnology Research), which will take place in Ravello, Italy, July 11-14, 2002.

Manosalva, P., S. Torres, F. Trognitz, R. Gysin, D. Niño-Liu, R. Simon, M. Herrera, W. Pérez, J. Landeo, B. Trognitz, M. Ghislain and R. Nelson. 2001. Plant defense genes associated with quantitative resistance to potato late blight. Pages 27-38 in Scientist and Farmer: Partners in Research for the 21st Century. International Potato Center, Program Report 1999-2000. Lima, Peru.

Orrego, R., J.J. Heath, J. Tenorio, C. Valencia, J.A. Landeo, M. Upadhya, K.A. Garrett, N. Zuñiga, A. Mendoza, A. Párraga, L. Cotrina, E. Roncal, M.A. Pacheco, O. Ortiz, and R. J. Nelson. 2001. Evaluation of potato genotypes through pilot-scale farmer field schools in the Peruvian Andes. Pages 225-237 in Scientist and Farmer: Partners in Research for the 21st Century. International Potato Center, Program Report 1999-2000. Lima, Peru.

Garry, G., G. Forbes, A. Salas, W. Pérez, M. Santa Cruz, H.M. Pinedo, E. Gonzales, M. Rivera and R.J. Nelson. 2001. Characterization of Phytophthora infestans colonizing different solanaceous species in Peru, with implications on the control of potato late blight. Pages 39-48 in Scientist and Farmer: Partners in Research for the 21st Century. International Potato Center, Program Report 1999-2000. Lima, Peru.

Pérez, W., A. Salas, R. Raymundo, Z. Huamán, R. Nelson and M. Bonierbale. 2001. Evaluation of wild potato species for resistance to late blight. Pages 49-62 in Scientist and Farmer: Partners in Research for the 21st Century. International Potato Center, Program Report 1999-2000. Lima, Peru.

Nelson, R.J. 2001. Biotic stresses in crops. Pages 155-173 in Crop Science: Progress and Prospects (Proceedings of the 4th International Crop Science Congress, Hamburg, Germany, 2000). CABI.

Sherwood, S., R. Nelson, G. Thiele, and O. Ortiz. 2000. Farmer Field Schools for ecological potato production in the Andes. ILEIA Newsletter 16(4): 24-26.

Zeigler, R. S., Kumar, J., Leung, H., Nelson, R.J. 2000. Evidence for recombination in Magnaporthe grisea: A case study from the Indian Himalayas. In: Advances in Rice Blast Research. Editors: Tharreau D., Lebrun M.H., Talbot N.J., and Notteghem J.L. Kluwer Academic Press, Dordrecht, the Netherlands. 243-247.

Ortiz, O., and R. Nelson. Farmer groups, extension organizations and research institutes team up to tackle late blight in seven countries. GILB Newsletter 10: 1-3.

Olanya, O.M, R. El-Bedewy, P.T. Ewell, J.J. Hakiza, F. Alacho, B. Ngombe, B. Kassa, G. Woldegiorgis, A. Mela, O. Ortiz and R. Nelson. 2000. Integrated Management of Late Blight through Farmer Field School: Achievements and Constraints in Uganda and Ethiopia. Proceedings of the May 2000 meeting of the African Potato Association.

Nelson R.J. et al. 1998. A Field Guide for Extensionists Conducting Farmer Field Schools Focused on Potato Late Blight.

Chen, D.-H., R.J. Nelson, G.-L. Wang, T. Inukai, D.J. Mackill, and P.C. Ronald. Characterization of blast resistance in the durably resistant rice cultivar Moroberekan. Proceedings of the Rice Blast Conference, Montpellier, France, 1998.

Ghislain, M., R. Nelson, T. Walker. 1997. Resistance to potato late blight: a global research priority. Biotechnology and Development Monitor no.31: 31-16.

Ghislain, M., M. Querci, M. Bonierbale, A. Golmirzaie, and R. Nelson. 1997. Biotechnology and the potato: Application for the developing world. International Potato Center, Lima Peru.

Gregory, P., R. Nelson, M. Ghislain, and M. Querci. 1998. Trends in potato research for developing countries. Chapter 51 in Crop productivity and sustainability, Proceedings of the 2nd International Crop Science congress. Delhi, December 1996.

Nelson, R.J., E. Ardales, M. Baraoidan, I. Yap, M.L.C. George, D.H. Chen, M. Finckh, A. Bordeos, C.M. Vera Cruz, T. Adhikari, C.C Mundt, M. Bustamam, W. Cruz, H. Leung, N. Huang, A. Yoshimura, S. McCouch, T.W. Mew, and J.E. Leach. 1996. Exploring the application of molecular markers for improving resistance to bacterial blight. In: Khush, G.S., Ed. Rice Genetics III. Proceedings of the Third International Rice Genetics Symposium. Manila (Philippines): International Rice Research Institute. 1011 p.

Inukai, T., R.J. Nelson, R.S. Zeigler, S. Sarkarung, D.J. Mackill, J.M. Bonman, I. Takamure, and T. Kinoshita. 1996. Genetic analysis of blast resistance in tropical rice cultivars using near-isogenic lines. In: Khush, G.S., Ed. Rice Genetics III. Proceedings of the Third International Rice Genetics Symposium. Manila (Philippines): International Rice Research Institute. 1011 p.

Adhikari, T., R.J. Nelson, T.W. Mew, and J.E. Leach. 1996. Assessment of genetic diversity of Xanthomonas oryzae pv. oryzae in Nepal. In: Khush, G.S., Ed. Rice Genetics III. Proceedings of the Third International Rice Genetics Symposium. Manila (Philippines): International Rice Research Institute. 1011 p.

Chen, D.H., R.S. Zeigler, and R.J. Nelson. 1996. Population structure of Pyricularia grisea in two IRRI blast nurseries: implications and applications. In: Khush, G.S., Ed. Rice Genetics III. Proceedings of the Third International Rice Genetics Symposium. Manila (Philippines): International Rice Research Institute. 1011 p.

Kumar, J. R.J. Nelson, and R.S. Zeigler. 1996. Population structure of Magnaporthe grisea in the traditional Himalayan rice system. In: Khush, G.S., Ed. Rice Genetics III. Proceedings of the Third International Rice Genetics Symposium. Manila (Philippines): International Rice Research Institute. 1011 p.

Courtois, B., R. Nelson y E. Roumen. 1997. Creacion de un acervo genetico para mejorar la resistancia partial a pyricularia en el arroz de secano, mediante seleccion recurrente. In: Seleccion recurrente en arroz. EP Guimaraes ed., Cali, Colombia, CIAT. p189-202.

Nelson, R.J., M. Fredrix, C.C. Mundt. 1995. A Field Guide for Extensionists Conducting Farmer Field Schools Focused on Management of Rice Blast.

Inukai, T., D.L. Viet, T. Imbe, R.S. Zeigler, T. Kinoshita, and R.J. Nelson. 1995. Identification of a fourth blast resistance gene in the Vietnamese indica cultivar Tetep. Rice Genetics Newsletter 12:237-238.

Aswidinnoor, H., R.J. Nelson, and J.P. Gustafson. 1995. Genome-specific repetitive DNA probes detect introgression of Oryza minuta genome into cultivated rice, Oryza sativa. Asia Pacific J. Molec. Biol. Biotech. 3:215-223.

Zhang, Q., J.E. Leach, R.J. Nelson, C. Wang, and T.W. Mew. 1995. Preliminary analysis of the population structure of Xanthomonas oryzae pv. oryzae in China. Chinese J. Rice Sci. 9(1): 7-14.

Chen, D., Z.Z. Ling, and R.J. Nelson. 1995. Pathotypic analysis of Pyricularia grisea using two sets of near isogenic lines. Int. Rice Res. Notes 20(4): 24-26.

Yoshimura, S., A. Yoshimura, R.J. Nelson, T.W. Mew and N. Iwata. 1995. Tagging Xa-1, the bacterial blight resistance gene in rice, by using RAPD markers. Japan. J. Breed. 45(1): 81-85.

Vera Cruz, C.M., L. Halda-alija, F. Louws, E. Lansing, D.Z. Skinner, M.L. George, R.J. Nelson, F.J. de Bruijn, and C. Rice, and J.E. Leach. 1995. Repetitive sequence-based polymerase chain reaction of Xanthomonas oryzae pv. oryzae and Pseudomonas species. Int. Rice Res. Notes 20(4):23-24.

Raymundo, A.K., A. Briones Jr., E.Y. Ardales, J.E. Leach, T.W. Mew, and R.J. Nelson. 1995. Genetic diversity in Xanthomonas oryzae pv. oryzicola. Int. Rice Res. Notes 20(3):12-13.

George, M.L.C., J.E. Leach, and R.J. Nelson. 1995. DNA fingerprinting of Xanthomonas oryzae pv. oryzae using IS1112-based polymerase chain reaction. Int. Rice Res. Notes 20(3):30-31.

Chen, D.H., R.S. Zeigler, and R.J. Nelson. 1995. Use of molecular analysis in selecting spreader row components for blast screening nursery. Int. Rice Res. Notes 20(3):31-32.

Chen, D.H., B. Consignado, and R.J. Nelson. 1995. An efficient inoculation method for rice blast. Int. Rice Res. Notes 20(2): 23.

Han, S.S., R.A. Dong Soo, and R.J. Nelson. 1995. Relationship between DNA fingerprints and virulence of Pyricularia grisea from rice and other hosts in Korea. Int. Rice Res. Notes 20 (1): 26-27.

George, M.L.C., W.T. Cruz and R.J. Nelson. 1994. DNA fingerprinting of Xanthomonas oryzae pv. oryzae by ligation-mediated polymerase chain reaction. Int. Rice Res. Notes 19(4): 29-30.

Mew, T.W., A. Parco, S. Hittalmani, T. Inukai, R. Nelson, R.S. Zeigler, and N. Huang. 1994. Fine mapping of major genes for blast resistance. Int. Rice Res. Notes 19(4): 4-5.

Cuoc, L.X., H.M. Trung, R.S. Zeigler, and R. J. Nelson. 1994. Studies on pathotypic characterization of some Magnaporthe grisea lineages causing rice blast disease. Nong Nghiep Cong Nghiep Thuc Pham 11:416-418. English summary.

Nelson, R.J., and H. Leung. 1994. The use of molecular markers to characterize pathogen populations and sources of disease resistance. In Rice Pest Science and Management, International Rice Research Institute, Los Banos, Philippines.

Zeigler, R.S., J. Tohme, R.J. Nelson, M. Levy, and F. Correa-Victoria. 1994. Lineage exclusion: a proposal for linking blast population analysis to resistance breeding, pp. 267-292. In Proceedings of the International Blast Conference, Madison, Wisconsin.

McCouch, S.R., Nelson R.J., Tohme J., and Zeigler R.S. 1994. Molecular mapping of blast resistance genes in rice. pp. 167-186. In: Rice Blast Disease. Zeigler, R.S., Leong, S.A., and Teng, P.S. (eds). CABI, Wallingford, U.K.

Reimers, P.J., A. Amante-Bordeos, A. Calvero, B.A. Estrada, R. Mauleon, N.S. Nahar, A.K.M. Shajahan, S. Darwis, F. Correa, and R.J. Nelson. 1994. Resistance to rice blast in a line derived from Oryza minuta. Int. Rice Res. Notes 19(2): 9-10.

Cottyn, B., A.T. Bautista, R.J. Nelson, J.E. Leach, J. Swings, and T.W. Mew. 1994. Polymerase chain reaction amplification of DNA from bacterial pathogens of rice using specific oligonucleotide primers. Int. Rice Res. Notes 19(1):30-31.

Mauleon, R., R. Scott, and R. Nelson. 1994. An improved protocol for nonradioactive DNA analysis using digoxigenin labeling. Int. Rice Res. Notes 19(1):27-28.

Talens, A.C.D., J.R.E. Wilke, P.Q. Cabauatan, R.J. Nelson and H. Koganezawa. 1994. Strain differentiation of rice tungro bacilliform virus by restriction fragment length analysis of polymerase chain reaction-amplified products. Int. Rice Res. Notes 19(1):10-11.

Inukai, T., R.J. Nelson, R.S. Zeigler, S. Sarkarung, I. Takamure and T. Kinoshita. 1994. Differentiation of pathogenic races of rice blast fungus by using near-isogenic lines with indica genetic background. J. Fac. Agr., Hokkaido Univ. 66:27-36.

Wang, G., D.J. Mackill, J.M. Bonman, and R.J. Nelson. 1993. RFLP mapping of major and minor resistance genes in a rice cultivar with durable resistance to blast. In Proceedings of Symposium on Durable Resistance, Feb. 1992.

Scott, R.P., R.S. Zeigler and R.J. Nelson. 1993. Lyophilized mycelium of Pyricularia grisea is non-viable and suitable for international exchange. Int. Rice Res. Notes 18(4):37.

Ardales, E., M. Baraoidan, I. Yap, T.W. Mew, R. Nelson, M. Yunus, H.R. Hifni, M. Herman, and M. Bustaman. 1993. Analysis of genetic diversity and population structure of bacterial blight (BB) pathogen in West Java, Indonesia. Int. Rice Res. Notes 18(4):28-29.

Inukai, T., R. Nelson, S. Sarkarung and R.S. Zeigler. 1993. Allelism between blast (Bl) resistance genes Pi-4a(t) and Pi-ta. Int. Rice Res. Notes 18(2):15.

Reimers, P.J., B. Consignado and R.J. Nelson. 1993. Wild species of Oryza with resistance to rice blast. Int. Rice Res. Notes 18(2):5.

Bernardo, M.A., N. Naqvi, H. Leung, R. S. Zeigler, and R. J. Nelson. 1993. A rapid method for DNA fingerprinting of the rice blast fungus Pyricularia grisea. Int. Rice Res. Notes 18(1):48-50.

Scott, R.P., R.S. Zeigler and R.J. Nelson. 1993. A procedure for miniscale preparation of Pyricularia grisea DNA. Int. Rice Res. Notes 18(1):47-48.

Raymundo, A.K., E.Y. Ardales, I.V. Yap, M.R. Baraoidan, T.W. Mew, and R.J. Nelson. 1993. Analysis of genetic variation in Xanthomonas oryzae pv. oryzae using PstI digestion. Philip. J. Biotechnol. 4(1):9-27.

Han, S.S., D.S. Ra, and R. Nelson. 1993. Comparison of RFLP-based phylogenetic trees and pathotypes of Pyricularia oryzae in Korea. Rural Dev. Admin. J. Agric. Scien. 35:315-323.

Yoshimura, S. R. Nelson, A. Yoshimura, T.W. Mew, and N. Iwata. 1992. RFLP mapping of the bacterial blight resistance genes Xa-3 and Xa-4. Rice Genet. Newsl. 9:136-138.

Inukai, T., D.J. Mackill, J.M. Bonman, S. Sarkarung, R. Zeigler, R. Nelson, I Takamure and T. Kinoshita. 1992. A blast resistance gene Pi-3(t) in near-isogenic line C104PKT. Rice Genet. Newsl. 9:94-95.

Inukai, T., D.J. Mackill, J.M. Bonman, S. Sarkarung, R. Zeigler, R. Nelson, I Takamure and T. Kinoshita. 1992. Blast resistance genes Pi-2(t) and Pi-z may be allelic. Rice Genet. Newsl. 9:90-91.

Vera Cruz, C.M., R. Nelson, H. Leung, J. Leach, and T.W. Mew. 1992. Reaction of rice cultivars from Ifugao Province, Philippines to indigenous strains of the bacterial blight pathogen. Int. Rice Res. Newsl. 17(2):8-9.

Wu, R., A. Hirai, J. Mundy, R. Nelson, and R. Rodriguez. 1991. Guidelines for nomenclature of cloned genes or DNA fragments in rice. Rice Genet. Newsl. 8:51-53.

Raymundo, A.K., R.J. Nelson, E.Y. Ardales, M.R. Baraoidan, and T.W. Mew. 1990. A simple method for detecting genetic variation in Xanthomonas campestris pv. oryzae (Xco) by restriction fragment length polymorphism (RFLP). Int. Rice Res. Newsl. 15(4): 8-9.

Amante-Bordeos, A.D., R.J. Nelson, N.P. Oliva, R.D. Dalmacio, H. Leung, and L.A. Sitch.. Transfer of blast and bacterial blight resistance from Oryza minuta to Oryza sativa, pp. 237-246. In Proceedings of the Second International Rice Genetics Symposium, May 1990, International Rice Research Institute, Los Banos, Philippines.

Nelson, R. 1990. Analyzing pathogen populations using molecular markers, pp. 89-98. In S. Mongkolsuk, P.S. Lovett and J.E. Trempy (ed.), Biotechnology and environmental science: molecular approaches. Plenum Press, New York, 230 pp.

Raymundo, A.K. and R. Nelson. 1989. Application of genetic engineering to pest management (a review). Philip. Agriculturist 72(4):444-457.

Nelson, R. 1988. The roles of 20-hydroxyecdysone and non-pupariating alleles of the Broad-Complex in the regulation of gene expression in the third larval instar of Drosophila development. Dissertation, University of Washington.


Software
Yap, I.V. and R. J. Nelson. 1996. WinBoot: A program for performing bootstrap analysis of binary data to determine the confidence limits of UPGMA-based dendrograms. IRRI Discussion Paper Series no. 14. International Rice Research Institute, P.O. Box 933, Manila, Philippines.

Nelson, R.J. et al. A Multi-Media Field Guide for Participatory Training and Research for Potato-Based Cropping Systems.

© 2006 Department of Plant Breeding and Genetics, Cornell University