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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Research Project #432488

Research Project: Genetics and Management of Newly Emerging Soybean Cyst Nematodes and Predominant Fungal Diseases for Sustainable Soybean Production

Location: Crop Genetics Research

Project Number: 6066-21220-013-000-D
Project Type: In-House Appropriated

Start Date: Feb 27, 2017
End Date: Feb 26, 2022

Objective 1: Identify sources of resistance to newly emerging soybean cyst nematode populations, develop new soybean germplasm with resistance, and develop methods for managing soybean cyst nematodes in soybeans using traditional and marker assisted breeding methods. Subobjective 1a. Phenotype Glycine max accessions available in USDA soybean germplasm collection for reaction to SCN populations. Identify new/additional sources of resistance, characterize for unique resistance genes and develop molecular markers associated with resistance. Subobjective 1b. Pyramid nematode resistance genes into elite backgrounds of maturity groups IV and V in combination with resistance to charcoal rot and Frogeye leaf spot to develop new germplasm/cultivars. Subobjective 1c. Determine the effect of soybean cyst nematode in combination with other plant-parasitic nematodes on crop damage in Mid South soybean production fields. Subobjective 1d. Evaluate entries in USDA Uniform Soybean Tests for Southern States and ARS breeding lines for reaction to SCN. Objective 2: Determine mechanisms underlying host-pathogen interactions in soybean for the fungal diseases charcoal rot and frogeye leaf spot, identify new sources of resistance in soybean to these diseases using improved screening methods, and develop methods for managing these fungal diseases using traditional and marker assisted breeding methods. Subobjective 2a. Evaluate and identify new sources of germplasms, breeding lines, and cultivars for charcoal rot and frogeye leaf spot resistance in stress and non-stress environments for use in breeding programs. Subobjective 2b. Evaluate the effects of cultural practices on charcoal rot and frogeye leaf spot severity and yield and develop alternate management practices for control of these diseases in soybean.

Identify new sources of resistance to nematode populations in soybean that will potentially broaden diversity among resistance genes in soybean cultivars and may provide more durable resistance. New soybean germplasm line or lines will be developed in two different maturity groups IV and V with resistance to soybean cyst nematode, frogeye leaf spot, and charcoal rot, as well as other fungal pathogens, nematodes and insect pests. Nematodes will be found in soybean fields, especially those with corn and/or cotton in the rotation. Valuable data for the reaction of breeding lines to nematode populations will be available to be utilized by the breeders for potential release to public and private sectors. New accessions and germplasm lines with resistance to charcoal rot and frogeye leaf spot will be identified and released.