Abstract
Seedcotton yield of Gossypium hirsutum L. data from the regional cotton variety trials of the EPAMIG breeding program from 1990 to 1999 were analyzed with the objectives of: estimating both the magnitude of genotype by environment interactions and the genotype adaptability and stability according to the methods proposed by Eberhart and Russell, Lin and Binns and Annicchiarico; and selecting advanced lines to compose the final trials of the program. Four groups of genotypes and environments were assembled and analyzed. For the first one, significant genotype x year and genotype x location x year interactions were detected. The most stable genotypes were MG-864492 and IAC 20. Significant second-order interactions were estimated for the three remaining groups studied. In the second group the most stable strains were MG-863192 (according to Eberhart and Russell method) and MG-863579 (according to Lin & Binn’s and Annicchiarico’ s methods). For the third genotype-environment group, the most stable genotype under all methods was MG-864133. The cultivar EPAMIG 5 Precoce-1, in the fourth group, presented stable performance also under the three methodologies tested.
Highlights
Seedcotton yield is a character of paramount importance in upland cotton breeding because it is one of the traits which most affect producers in a certain way determining the success of the crop in terms of gains or profits
Yield is a trait of polygenic inheritance it is strongly influenced by environmental factors, so the phenotypic response of a genotype is determined by the genetic and environmental effects upon it, but with a high frequency of occurrence of a third effect, of no less importance, which is the genotype-by-environment interaction (GEI)
The objective of This research was to estimate the magnitudes of genotype-by-environment interactions as well as the adaptability and stability parameters for seedcotton yield of the genotypes evaluated in those trials, according to the methods proposed by: Eberhart and Russel; Lin and Binns and Annicchiarico
Summary
Seedcotton yield is a character of paramount importance in upland cotton breeding because it is one of the traits which most affect producers in a certain way determining the success of the crop in terms of gains or profits. Yield is a trait of polygenic inheritance it is strongly influenced by environmental factors, so the phenotypic response of a genotype is determined by the genetic and environmental effects upon it, but with a high frequency of occurrence of a third effect, of no less importance, which is the genotype-by-environment interaction (GEI) Such interaction, in the process of widely adapted cultivar development, constitutes one of the great problems in breeding programs and when recommendation of cultivars for a wide spectrum of environments is to be considered (Vencovsky et al, 1990). In the early stages of a breeding program, the presence of genotype x environment interactions may influence the estimates of genetic variance, in turn overestimating expected genetic gains due to selection (Duarte and Vencovsky, 1999). 1/ 1-Genotypes present in the first group; 2- Genotypes present in the second group; 3- Genotypes present in the third group; 4- Genotypes present in the fourth group.
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