An investigation of the grain yield adaptation of advanced CIMMYT [International Maize and Wheat Improvement Center] wheat lines to water stress environments in Queensland, 2. Classification analysis
1994
Cooper, M. (Queensland Univ., Brisbane (Australia). Dept. of Agriculture) | Byth, D.E. (ICRISAT, Andhra Pradesh (India)) | Woodruff, D.R. (Queensland Dept. of Primary Industries, Toowoomba (Australia). Queensland Wheat Research Inst.)
Classification methodology was used to characterize the genotypic variation and line by environment (L x E) interaction for grain yield of a sample of advanced CIMMYT wheat lines and 3 local check cultivars tested over 6 Queensland environments. Groups of CIMMYT lines which outyielded the 2 groups which contained the 3 Queensland cultivars were identified. The yield advantage of the groups of CIMMYT lines decreased with increasing severity of water stress at anthesis and in the environment where the most severe stress was characterized there were no yield differences among the groups of lines. The yield advantage of the groups of CIMMYT lines was generally associated with a higher number of grains per unit area and in some cases a higher grain size. While the incidence of the large L x (water-stress) interactions encountered in this study would complicate selection for yield, the identification of groups of advanced CIMMYT lines which outyielded the Queensland cultivars in 5 of the 6 environments suggests that the L x (water-stress) interactions do not preclude scope for further improvement of grain yield of wheat in Queensland.
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