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United States Department of Agriculture

Agricultural Research Service

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Location: Plant Genetics Research

2013 Annual Report

1a. Objectives (from AD-416):
Develop and deploy a molecular model for soybean flowering time and maturity that can be utilized to more efficiently develop higher yielding soybean germplasm with improved seed composition traits for multiple production environments.

1b. Approach (from AD-416):
Soybean maturity will be modeled with molecular genetic data for the three E gene loci and corresponding phenotypic data. Soybean lines will be developed and evaluated for yield utilizing the molecular markers targeting maturity groups I, III, and V. Soybean lines with maturity groups I, III, and V will also be developed that contain the high oleic acid seed oil or low phytate seed meal traits by utilizing a straight cross molecular marker-assisted approach to converge appropriate maturity and seed composition traits.

3. Progress Report:
This research relates to the in-house project "to develop the molecular basis for modification of the fatty acid components of soybean oil and anti-nutritional components in soybean meal to use in accelerated breeding programs" by determining what gene combinations contribute to agronomic traits. During the past year, research progressed according to the planned activities. ARS scientists in Columbia, MO developed genotyping assays for the common alleles of the three main maturity genes in the project. Those assays were used to evaluate the maturity genes in a variety of soybean lines. The results of those experiments allowed us to develop and revise a molecular maturity model for soybean maturity groups (MG) I, II, III, IV, and V. We developed soybean populations to test the evolving maturity model as well as the ability to create new seed composition lines targeted for MG I and MG V, and those soybean lines were shared with collaborators in MG I and MG V locations. In our MG III/IV location, we planted all soybean lines from the test populations to score for flowering time and maturity. Further development of soybean lines is also underway to exchange maturity alleles from a high yielding MG I line with a high yielding MG V line. The impact of this research will be the ability to directly select for targeted soybean maturity which will increase the speed of new soybean variety development.

4. Accomplishments

Last Modified: 06/25/2017
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