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United States Department of Agriculture

Agricultural Research Service

Research Project: Identication and Utilization of Exotic Germplasm to Improve Soybean Productivity

Location: Crop Genetics Research Unit

2011 Annual Report

1a.Objectives (from AD-416)
Identify soybean accessions with high seed germinability.

1b.Approach (from AD-416)
Conduct assays with accessions from the USDA soybean germplasm collection in order to identify accessions with high seed germinability.

3.Progress Report

The objectives of this project are to identify and utilize new soybean resources to improve seed quality, germination, and yield under the stressful production conditions of the midsouthern United States. It relates to the National Program for genetic improvement of soybeans by developing and releasing enhanced genetic resources and varieties.

Twenty-seven new high-germinability breeding lines and 12 soybean cultivars/accessions were evaluated for germination, vigor, hardseededness, Phomopsis seed decay, and seed composition after harvests at maturity, 2 weeks after maturity, and 4 weeks after maturity. Seed yield and seed coat wrinkling were evaluated at harvest maturity. The best high-yielding high-germinability breeding line (DS25-1) yielded 59 bu/A and had a seed germination of 96%. Further, DS25-1 maintained germination above 90% (94%) even after a two-week harvest delay. Its germination percentage only dropped to 82% after a delayed harvest of 4 weeks. By comparison, high-yielding cultivar AG 4903 (67 bu/A) had seed germinations corresponding to the harvest dates of DS25-1 of 44%, 39%, and 33%, respectively. The two lines matured 1 day apart. In terms of Phomopsis seed infection, DS25-1 and AG 4903 had 0 and 8%, respectively, when harvested on time and 2.7 and 11%, respectively, when harvested after a two-week delay. By comparison, DT97-4290 had 27 and 48% Phomopsis seed infection levels when harvested at harvest maturity and with a 14-day harvest delay, respectively. DT97-4290 matured on the same date as AG 4903.

Activities for this project were monitored by the ADODR through visits, reports, and meetings.

Last Modified: 11/25/2015
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