2013 Annual Report
1a.Objectives (from AD-416):
Our objective is to identify and utilize exotic germplasm to improve U.S. soybean productivity. We will deliver:.
1)high yielding lines derived from exotic germplasm that are available to all U.S. soybean breeders developing new cultivars,.
2)quantitative trait loci (QTL) affecting yield with the positive allele derived from exotic germplasm and the DNA markers associated with these loci, and.
3)lines derived from exotic germplasm that will improve the yield and seed quality in the Early Planting Production System of the mid-south.
1b.Approach (from AD-416):
High-yielding experimental lines will be developed from exotic germplasm to expand the genetic base and accelerate the rate of yield improvement of soybean production in the U.S. This breeding project will use over 150 soybean introductions and many experimental lines derived from these introductions in past USB projects. These introductions include modern Asian varieties that are unrelated to U.S. cultivars, diverse primitive varieties that predate scientific plant breeding, and wild soybean. The number of exotic lines that we are using exceeds the total number of all the ancestral lines, regardless of the size of their contribution, of all of the current varieties grown in the U.S. Our projects are located in all major soybean-growing regions of the U.S. so that new genes for increasing yield from exotic germplasm will be accessible to soybean breeders and eventually soybean farmers in every soybean-producing state. We will also be testing exotic germplasm and lines derived from exotic germplasm in the Early Planting Production System of the mid-south to select for high yield and improved germination rates in the harvested seeds. Concurrently with developing high yielding experimental lines, we are developing sets of lines (mapping populations) that will allow us to begin the process of identifying specific genes (quantitative trait loci, QTL) from exotic germplasm that can increase yield of commercial varieties and then to confirm those QTL in independent populations.
In the cooperative maturity group I tests, lines from the crosses M97-136016 x PI603290 and NE1900 x PI347550B were equal to the checks for yield.
In the Uniform 00 test, MN06-378172 was only 1.8 bu/a less than the highest yielding check and has PI 445826 as a parent. In the Preliminary 0 test, M06-381085 was 2.4 bu/a less than Sheyenne, the highest yielding check, and has PI 603290 as a parent.
M02-495076, a maturity group I line with the pedigree LG98-1605 x MN0302, has been released. The pedigree of LG98-1605 is 100% exotic germplasm with contributions from 6 exotic accessions.