| Title: | Quantitative trait loci analysis of stem strength and related traits in soybean |
| Authors: | Chen, H., Shan, Z., Sha, A., Wu, B., Yang, Z., Chen, S., Zhou, R., Zhou, X. |
| Source: | Euphytica 2011, 179(3):485-497 |
| Abstract: | Stem strength is one of the major influencing factors of lodging in soybean [Glycine max (L.) Merr.] as well as other crops. To identify quantitative trait loci (QTL) associated with stem strength and related traits in soybean, a recombinant inbred line (RIL) population consisting of 165 lines derived from Zhongdou No. 29 9 Zhongdou No. 32 was used in 3 years. Significant positive correlations were found among the four traits (stem strength, stem diameter, number of nodes, root dry weight). A linkage map spanning 1,240.7 cM was constructed using 245 SSR (simple sequence repeat) markers and a phenotypic marker (leaflet shape). By composite interval mapping and two-round strategy of QTL meta-analysis, 32 consensus QTL and 19 unique QTL were identified, respectively. Of eight pleiotropic unique QTL, two QTL (uq.A2-2 and uq.A2-3) located at the intervals of 23.2Ü26.8 and 38.5Ü42.4 cM on linkage group A2, respectively, were associated with all the four traits. Additive 9 environment (ae) interaction effects, epistasis (aa) and epistasis 9 environment (aae) interaction effects of QTL were detected as well. The results provide useful information for further genetic studies on stem strength of soybean. |