Inheritance of partial resistance to Sclerotinia sclerotiorum in soybean cultivars Asgrow A2506 and Novartis S19-90.

Reference Report for IND21994853

Title:	Inheritance of partial resistance to Sclerotinia sclerotiorum in soybean cultivars Asgrow A2506 and Novartis S19-90.
Authors:	Hoffman, D.D., Nickell, A.D., Nickell, C.D., Diers, B.W., Hartman, G.L.
Source:	Soybean Genet. Newsl. 1999, 26(3):1-2
Abstract:	The objectives of this study were to: (1) estimate the number of genes contributing to resistance to S. sclerotiorum in the soyabean cultivars Asgrow A2506 and Novartis S19-90; and (2) estimate broad- and narrow-sense heritabilities. Data from greenhouse evaluations of three crosses, Asgrow WR2347 √ó Asgrow A2506, Novartis S19-90 √ó Asgrow A2506, and Novartis S19-90 √ó Asgrow WR2347, were used to estimate goodness of fit for theoretical inheritance models in F2 and F3 generations and to estimate heritabilities. Significant results were found indicating that partial resistance to S. sclerotiorum is caused by multiple genes and some may be recessive. Estimates of heritabilities indicated more dominance occurred when Novartis S19-90 was used as a parental line compared with Asgrow A2506. All heritability estimates based on F2:3 family means (>0.86) were higher than the heritability estimates on a F2 plant basis. This presages selection for partial resistance to S. sclerotiorum in soyabean based on F2:3 family means evaluation would be more efficient than selecting on a single F2 plant basis. The high heritability estimates in greenhouse evaluations are valuable to soyabean breeders selecting for partial resistance to S. sclerotiorum.

Funded by the USDA-ARS. Developed by the USDA-ARS SoyBase and Legume Clade Database group at the Iowa State University, Ames, IA

U.S. Public Domain