About Us | Help Videos | Contact Us | Subscriptions

Agronomy Journal Abstract -

Performance and Stability of Brachytic and Normal-Stemmed Isolines of Soybean


This article in AJ

  1. Vol. 89 No. 2, p. 275-278

    * Corresponding author(s): rboerma@uga.cc.uga.edu
Request Permissions

  1. Suk Ha Lee,
  2. Roger H. Boerma ,
  3. Paul L. Raymer and
  4. Doyle A. Ashley
  1. D ep. of Crop and Soil Sciences, Natl. Crops Exp. Stn., RDA, Suwon 441-100, Korea
    D ep. of Crop and Soil Sciences, Univ. of Georgia, Miller Plant Sci. Bldg., Athens, GA 30602-7272
    D ep. of Crop and Soil Sciences, Univ. of Georgia, 1109 Experiment St., Griffin, GA 30223-1797



Plant lodging is a problem in soybean [Glycine max (L.) Merr.] production, particularly in high-yield environments. The brachytic stem trait (sbl 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 x environment interaction (P < 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 R2 values). For B-Wright, however, a smaller regression coefficient (b = 0.82 ± 0.07) than Wright (b = 1.07 ± 0.05) and a lower R2 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.

Research supported by funds allocated to the Georgia Agric. Exp. Stn. and grants provided by the Georgia Agric. Commodity Commission for soybeans.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .