Submitted to: Soybean Research World Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: February 5, 2004
Publication Date: February 5, 2004
Citation: Smith, J.R., Daughtry, L., Mengistu, A., Paris, R.L., Nelson, R.L. 2004. Screening selected plant introductions for seed quality in the early soybean production system [abstract]. VII World Soybean Research Conference Proceedings. p.237-238. Technical Abstract: The early soybean production system (ESPS) was adopted in the Mid South USA to avoid late season drought and increase soybean yield. However, soybean maturation and harvest during periods of high temperatures can produce seed with poor quality; wrinkled, diseased, smaller sized, and impermeable seed coat. Improved cultivars with high seed quality are needed for use in the ESPS. The objective of this research was to find new genotypic sources of high seed quality suitable for use in the ESPS. Nearly 500 accessions from the US soybean germplasm collection were assayed in a furrow-irrigated ESPS planting at Stoneville, MS in 2002. Diverse accessions were selected from MGs II, III, and IV based on their geographic origin and their potential for heat tolerance. The 25 ancestor lines for all US MG II-IV cultivars were also included for comparative purposes. All seed was timely harvested and assayed for incidence of Phomopsis, Fusarium, seed wrinkling, impermeable seed coat, and percent germination in standard and accelerated-aging germination tests. There were wide differences among accessions for all traits assayed. A total of 62 accessions had a germination score greater than or equal to 90%, while also having no detectable Phomopsis, Fusarium, wrinkled seed, or seed with impermeable seed coats. In contrast, no ancestor accession had a germination score greater than or equal to 90% and all had detectable levels of most of the other detrimental traits assayed. This study demonstrates genotypic differences for seed quality traits and highlights potential resources for improving seed quality in the ESPS.