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Graduate Field Faculty

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Mark Bridgen

Professor; Director, Long Island Horticultural Research and Extension Center
Mark Bridgen serves as the Director of the Long Island Horticultural Research & Extension Center in Riverhead, NY.  Bridgen’s research revolves around the breeding and improvement of ornamental plants.  Recent breeding projects involve the development of new Impatiens cultivars that are resistant to Impatiens Downy Mildew.  Other breeding research is developing Alstroemeria plants (Inca Lily; Lily-of-the-Incas) that are winter hardy to USDA zone 5 and warmer, as well as the generation of new Vitex (Chaste Tree) cultivars from in vitro techniques.
 
Dr. Bridgen’s research interests are in the areas of new plant development and breeding, plant environment interactions, plant cell and tissue culture, in vitro plant breeding, plant propagation, genetic modifications for plant improvement, and plant growth and development of ornamental plants. Specific in vitro breeding techniques include somaclonal and gametoclonal variation, embryo culture, somatic embryogenesis, mutation breeding, meristem culture for the production of pathogen free plants, and micropropagation. Dr. Bridgen also teaches the Plant Propagation class.
 
Additional field membership: Horticulture
Susan Brown

Susan Brown

Professor
My research is focused on the genetic improvement of apple and the introduction of new cultivars.  Our goal is to produce superior, high-quality apple varieties. Reduced reliance on chemical control is also a goal, where possible.  Traditional breeding is integrated with marker-assisted selection.  Research areas include the study of pre- and postharvest fruit quality, nutritional components, plant form, and resistance to fungal (apple scab, cedar apple rust, powdery mildew) and bacterial diseases such as fire blight (Erwinia amylovora).  Additional genes of interest are being investigated. Results of genetic studies, and our participation in RosBREED 1 and 2, indicate excellent prospects for improvement of many traits. The collaborative research at Cornell, and with other programs, has yielded tremendous results.  Markers are being sought for both qualitative and quantitative traits.   Genetic progress has been excellent, but there are always research areas needing further investigation.
Edward Buckler

Edward S. Buckler

Adjunct Professor
The Buckler  Lab for Maize Genetics and Diversity uses functional genomic approaches to dissect complex traits in maize, biofuel grasses, and grapes. We exploit the natural diversity of these plant genomes to identify the individual nucleotides responsible for complex (quantitative) variation.
 
Ronnie Coffman

Ronnie Coffman

Andrew H. & James S. Tisch Distinguished University Professor
Faculty responsibilities include plant breeding activities related to international agriculture; maintaining a liaison with national and international agencies, foundations and centers and arranging for students to conduct research abroad in cooperation with appropriate institutions; serving as a member of the Graduate Faculty in the Field of International Agriculture as well as the Field of Plant Breeding; serving as an advisor to students interested in plant breeding as it pertains to international agriculture, particularly students from other countries and those interested in conducting research abroad.
 
I also serve as Director of International Programs (IP) for the College of Agriculture and Life Sciences (CALS).  IP/CALS provides support for the international activities of CALS faculty, students and staff covering a wide range of efforts: scientific exchanges, overseas research, undergraduate and graduate education, professional development, short courses, technical assistance, advising, publications, and other outreach. Major projects related to plant breeding include the Delivering Genetic Gain in Wheat (DGGW) project and the NextGen Cassava Project.
 
Additional Field membership: International Agriculture.
Walter De Jong

Walter De Jong

Associate Professor
My research is focused on the genetic improvement of potato.  I oversee the Cornell potato breeding program, which develops new varieties that are adapted to the environment of New York and neighboring states, and conduct basic research aimed at cloning the genes underlying several morphological traits. The emphasis in variety development is to combine resistance to the golden nematode and scab with other attributes needed in a successful variety.   Target market niches include round white varieties with resistance to low temperature sweetening and high dry matter for the chipping industry, and round white and red-skinned cultivars for fresh market use.   The recent resurgence of late blight and discovery of race 2 of the golden nematode in NY have led to markedly increased efforts to breed for resistance against both of these pathogens.
 
Laboratory research centers on the characterization and cloning of genes influencing tuber shape and pigmentation.  A better understanding of how these characters are controlled should lead to a more rational and directed improvement of potato appearance, upon which most purchasing decisions are based.   Molecular genetic approaches are also being used to simplify the process of selecting desirable clones in the breeding program.   Our current target is to develop diagnostic markers linked to processing quality.

Jeff J. Doyle

Professor
My research lies in the area of comparative genomics, molecular systematics, and genome evolution. Nearly all work in my lab involves polyploidy—whole genome duplication—which is a common phenomenon in plants, including many crop species. Much of our work focuses on the legume family, particularly in soybean and its wild perennial relatives (Glycine), where several cycles of polyploidy are known to have occurred. Perennial soybean relatives are of interest as sources of biotic and abiotic stress resistance for soybean, and we assaying genetic diversity across this group, which includes numerous un-named species, and studying resistances in several species, notably to white mold, an important soybean pathogen. Much of our work focuses on recently formed (less than 500,000 years) allopolyploid fixed hybrids, with a goal of understanding the impacts of allopolyploidy on phenomena such as photoprotection, nodulation, and transcriptome size evolution. In addition to Glycine, students and postdoctoral fellows in the lab have worked on polyploid cultigens such as autopolyploid alfalfa, the tetraploid Ethiopian grain, tef (Eragrostis tef), the octoploid Andean tuber crop, oca (Oxalis tuberosa), the autopolyploid dragonfruit cactus (Selenicereus megalanthus), as well as plants of medicinal interest such as pot marigold (Calendula officinalis, a tetraploid), economically important weeds such as tetraploid johnsongrass (Sorghum halepense), and plants of conservation interest such as species of the genus Amorpha, which includes diploids and tetraploids. Systematics studies in the lab typically involve the identification of the genomic origins of polyploids. Comparative genomic studies address the impact of polyploidy on genome evolution, emphasizing particular gene families. Collaborative projects focus on the impact of polyploidy on cell biology with the goal of elucidating the earliest effects of genome duplication. I teach PLBIO 4470, Molecular Systematics, and PLBIO 4831 Plant Gene Evolution and Phylogeny.

Additional Field membership:  Plant Biology.
 
The focus of research in the Giovannoni Laboratory is molecular and genetic analysis of fruit ripening and related signal transduction systems with emphasis on the relationship of fruit ripening to nutritional quality. They are also involved in development of tools for genomics of the Solanaceae including participation in the International Tomato Sequencing Project.

Michael Gore

Associate Professor
The Gore Lab takes an interdisciplinary approach to studying the genetic variability of vitamins and minerals that are essential in plant-based food and feed. Through the integration of statistical genetics, genomics, and metabolomics, we are striving to elucidate the underlying genetic basis of natural variation for vitamin and mineral content of grain in maize and oat and cassava roots. These combined approaches have had success in the identification of key genes/alleles that are critical for the development of nutrient-dense crops. Additionally, we develop and implement field-based, high-throughput phenotyping tools (mobile and robotic platforms combined with deep learning algorithms) in breeding programs for monitoring and improving the resiliency of crops to pests, pathogens, and environmental stress.
Phillip Griffiths

Phillip Griffiths

Associate Professor
The vegetable improvement program at Geneva focuses on the breeding and genetics of common bean, crucifer and tomato crops. The goals include the introgression of host plant resistance to economically important pests, tolerance to environmental stresses and the selection of niche-market crops and traits.

Jean-Luc Jannink

Adjunct Professor
Jean-Luc Jannink's primary focus is on developing statistical methods to use DNA markers in public sector small grains breeding.  To make the research relevant to small grains, it should emphasize low cost markers to the extent possible because small grains have relatively low value. To make the research relevant to the public sector, it should be applicable to many relatively little programs that seek to leverage their joint efforts into something greater.

Awais Khan

Associate Professor
My research focus is to characterize mechanisms of disease resistance and pathogenesis, strategies and tools for accelerated and targeted improvement of disease resistance in rosaceous fruits and to develop high-throughput methods for plant resistance phenotyping. We use quantitative genetics, QTL and association mapping, genomics, transcriptomics and bioinformatics to detect genetic regions and candidate genes controlling resistance to fungal and bacterial diseases such as fire blight and apple scab. We also identify molecular markers tightly linked with QTLs and develop multiplexed marker assays to deploy multiple resistance alleles in commercially favored backgrounds through marker-assisted selection. Significant efforts are devoted into fine mapping and genome editing for gene discovery, validation and to develop varieties with improved disease resistance. One of our research interests is to develop high-throughput resistance phenotyping methods to visualize, quantify and assess the severity of disease, and differences in response between plants in terms of symptoms and progress rate. For example, we are developing real-time imaging and analytical methods to monitor progress of fire blight infection, with concurrent sampling of transcripts and the metabolome to identify specific spatio-temporal mechanisms at genetic, cellular, and molecular levels.
Li Li

Li Li

Adjunct Professor
Li Li’s research projects are in a number of areas (carotenoids, flavonoids, and micronutrients) associated with crop nutritional quality improvement. Primary research focuses on carotenoid metabolism.
Michael Mazourek

Michael R Mazourek

Associate Professor
The overall theme of Michael Mazourek's program is innovation of vegetables for adaptation for production in the Northeastern US and to be of improved quality and nutrition for consumers. He conducts much of this selection in Organic systems that represenst a more natural environment. By working in a natural environment, he is better able to draw parallels between the artificial selection that takes place in plant breeding with the natural selection that has taken place during the evolution of crop progenitors.
Susan McCouch

Susan McCouch

Professor
Susan McCouch's research focuses on rice and includes publication of the first molecular map of the rice genome in 1988, early QTL studies on disease resistance, drought tolerance, maturity and yield, cloning of genes underlying domestication traits, and demonstrating that low-yielding wild and exotic Oryza species harbor genes that can enhance the performance of modern, high-yielding cultivars. Recently, she has used genome wide association studies (GWAS) to demonstrate that the different subpopulations of O. sativa have significantly different genetic architecture.
Martha Mutschler-Chu
Martha Mutschler-Chu is a vegetable breeder / geneticist working on tomato and long-day onion. Her areas of interest concern the genetic control of novel traits derived from wild species, the genetic control/physiological mechanisms underlying these novel traits and their use in vegetable improvement.
Rebecca Nelson

Rebecca Nelson

Professor
Rebecca Nelson's interests and objectives pertain to plant pathology, plant breeding and international agriculture. Her own research program is focused on understanding the ways in which plants defend themselves against pathogen attack.
Wojciech Pawlowski

Wojtek Pawlowski

Associate Professor
Wojtek Pawlowski's research group studies meiotic recombination using genetics, biochemistry and several advanced microscopy methods, such as restorative deconvolution, multiphoton excitation, and structured illumination microscopy.
Bruce Reisch

Bruce Reisch

Professor
Bruce Reisch specializes in the development of new wine and table grape varieties, as well as new grape breeding techniques. Since joining the Cornell faculty in 1980, his program has released eleven new grape varieties - eight wine grapes (cooperatively with the Dept. of Food Science and Technology) and three seedless table grapes. The grape breeding program continues to emphasize wine variety development with a strong emphasis on combining wine quality with disease resistance and cold tolerance.
Lawrence Smart

Lawrence Smart

Professor; and Program Leader
The research in Lawrence Smart's lab is focused on breeding, genetics, genomics, and physiology of shrub willow bioenergy crops. Shrub willow (Salix spp.) produce high yields of woody biomass when grown as a dedicated short-rotation crop on marginal or underutilized land. Willow stems are harvested every three years and the plants resprout after each cutback, making willow fields productive for more than 20 years.
Margaret Smith
Margaret E. Smith joined the faculty at Cornell University in 1987 in the College of Agriculture and Life Science’s Department of Plant Breeding and Genetics, focusing on corn breeding. Her research goal is to enhance our understanding of corn adaptation to marginal environments and develop genetic materials that will improve corn productivity and sustainability in such environments.
Mark E. Sorrells, M.E. Sorrells

Mark E. Sorrells, M.E. Sorrells

Fellow Atkinson Center for a Sustainable Future; Fellow Cornell Institute for Food Systems
The objectives of the Cornell Small Grains Project are to:
1. To develop and evaluate novel breeding strategies for selection and for testing large number of genotypes for desirable agronomic characters.
2. To elucidate the inheritance, chromosomal location and expression of genes controlling economically valuable plant characteristics.
3. To develop, evaluate, and introduce new cultivars of small grains having improved yield, nutritional quality, disease resistance, and other characteristics that increase the crop value and production efficiency.
 
Approximately half of our breeding research effort is allocated to soft white winter wheat and the other to soft red winter wheat, spring oats, and spring barley. Breeding methods employed by the program include bulk, pedigree, single seed descent, and backcross, depending on the breeding objectives. A regional variety testing program is conducted annually.
 
Our research program utilizes appropriate technologies encompassing molecular genetics, physiology, pathology, and breeding to research strategies that contribute to the development of superior crop varieties. We collaborate with plant breeders and geneticists around the world including international centers on projects that involve the use of molecular markers to assess genetic relationship, construct linkage maps, and clone genes. The focus of our basic work involves comparative genomics, association mapping, allele characterization and particularly genomic selection methods. Characterization of allelic diversity and allelic value in both wild and cultivated germplasm is fundamental to crop improvement and efficient strategies are a major focus. Current research projects include mapping, cloning and characterization of candidate genes underlying QTL for preharvest sprouting resistance, milling and baking quality, kernel size and shape, mapping novel stem rust resistance genes, and nutritional quality. We also recently completed a large project on evaluating ancient and specialty grains.
 
I teach Plant Breeding Methods Lab (PLBR 4060) and Perspectives in Plant Breeding Strategies (PLBR 7160) – alternate years.
 
Programs in the College of Agriculture and Life Sciences.
Donald Viands
Donald Viands leads the Cornell Forage Breeding Project to conduct genetic research and develop cool season, perennial forage cultivars with higher yield, multiple disease and insect resistances, and forage quality. His project also conducts research on use of perennial grasses and legumes as feedstocks for the biofuel industry.

The Forage Breeding Project focuses primarily on breeding and genetic research of alfalfa and on evaluating legume and grass cultivars for forage yield and quality. Forage yield evaluation consists of harvesting 4-5000 plots at least three times per growing season. Breeding objectives on alfalfa are to improve yield, quality, and persistence.
 
Forage yield is being improved by developing plant populations from both adapted and unadapted sources, followed by selecting vigorous plants with good agronomic characteristics. We are also empirically comparing various selection methods for improving forage yield.
 
Nutritional quality of alfalfa for the dairy animal is a priority in most alfalfa breeding programs in North America. Research on methods to improve quality has been a major focus of the Cornell breeding project for more than three decades. We currently are selecting plants with lower fiber concentration and higher forage pectin concentration for providing more energy for rumen microbes that convert protein into a form usable for milk production.
 
Breeding for plant persistence requires a significant proportion of effort to maintain the perennial nature of the crop. Traits of interest are disease and insect resistance, root traits, and winter hardiness. In cooperation with entomologists at Cornell, breeding efforts have been developing alfalfa with resistance or tolerance to the alfalfa snout beetle and to clover root curculio. The first insect devastates alfalfa within 2 years of planting and has potential of spreading across North America. We also are developing and evaluating alfalfa with glandular trichomes for resistance to potato leafhopper.
In cooperation with eight forage breeders in North America, a small amount of Cornell effort goes into breeding birdsfoot trefoil for resistance to crown rot and Fusarium root rot and with a rhizomatous trait.

A recent initiative on the Forage Breeding Project is to evaluate grass and legume species and breed some of these species as feedstocks for the biofuel industry. In addition, we are cooperating with others to evaluate industrial hemp varieties and to develop new varieties for New York State.
 
I teach Quantitative Genetics (PLBR 7170) – alternate years.
 
I also serve as Associate Dean and Director of Academic Programs in the College of Agriculture and Life Sciences
 

Courtney Weber

Associate Professor
The focus of my research is the genetic improvement of strawberry, raspberry and blackberry to combine superior fruit quality and yield with improved disease resistance for more sustainable production. In strawberry, season extension is a priority through the incorporation of annual production system adaptation and day-neutrality. In raspberry and blackberry, season extension is being developed utilizing the primocane fruiting trait. A renewed interest in floricane (summer) bearing types has developed in recent years due to the emergence of the invasive spotted wing drosophila (Drosophila suzukii) fruit fly which is more prevalent during the primocane (fall bearing) season. Molecular techniques are being applied to aid in traditional breeding efforts including the whole genome sequencing, RNAseq, and validation of gene editing technology in order to better understand inheritance of important traits, as well as for direct cultivar improvement. In vitro culture for micro-propagation is routinely utilized and research into virus elimination utilizing chemotherapy techniques is ongoing.

Kenong Xu

Associate Professor
The goal of Kenong Xu's research program is to discover and characterize apple genes or gene networks controlling traits of horticultural and/or economic importance using tools of plant genomics. The research findings of the program will (1) advance our knowledge in understanding the underlying mechanisms of these traits, and (2) enable us to develop and integrate efficient approaches and tools for the improvement of apple scion varieties and rootstocks.