SoyBase Follow us on Twitter @SoyBaseDatabase
Integrating Genetics and Genomics to Advance Soybean Research



Reference Report for IND20599860
Title:Performance and stability of brachytic and normal-stemmed isolines of soybean.
Authors:Lee, S.H., Boerma, H.R., Raymer, P.L., Ashely, D.A.
Source:Agron. J. 1997, 89(2):275-278
Abstract:Plant lodging is a problem in soybean (Glycine max (L.) Merr.) production, particularly in high-yield environments. The brachytic stem trait (sb1 sb2) reduces plant stature while maintaining the number of nodes for fruiting and may be desirable in the development of lodging-resistant cultivars. To determine the effects of brachytic stem on seed yield, plant height, and other agronomic traits across a range of environments, this trait was backcrossed into 'Wright' and 'GaSoy 17', and the near-isogenic lines (isolines) were evaluated in 57 (Wright) and 36 (GaSoy 17) environments. Averaged across environments, the height of brachytic Wright (B-Wright) was 56% of its normal-stemmed isoline and that of brachytic GaSoy 17 (B-GaSoy 17) was 66% of its isoline. In a combined analysis over environments, brachytic genotypes averaged 37% shorter internode length, 5% fewer nodes, and 7% smaller seed weight than normal-stemmed isolines. Brachytic and normal-stemmed isolines did not differ in yield, seed protein concentration, or seed oil concentration. There was a genotype times environment interaction (P lt 0.01) for yield for both isoline pairs. Regression analysis of yield stability indicated that the GaSoy 17 isolines were equally stable across environments (similar coefficients and R-2 values). For B-Wright, however, a smaller regression coefficient (b = 0.82 +- 0.07) than Wright (b = 1.07 +- 0.05) and a lower R-2 value (70 vs. 89%) suggest that Wright yielded higher in favorable environments and was more stable in yield performance. Plant height of brachytic lines was much less stable than for normal-stemmed lines. Genotypes with the brachytic stem trait produced yields similar to normal-stemmed genotypes in environments not highly conducive to lodging. The reduced stability of yield and plant height for brachytic-stemmed genotypes must be considered (along with the expected increase in yield in lodging-prone environments) prior to commercial acceptance.






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