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Performance of Yield and Stability of Advanced Wheat Genotypes under Heat Stress Environments of the Indo-Gangetic Plains

^a Directorate of Wheat Research, Karnal, Haryana, India
^b CCS Haryana Agriculture Univ., Hisar, Haryana, India
^c Punjab Agriculture Univ., Ludhiana
^d A.R.S., Rajasthan Agriculture Univ. Durgapura, Jaipur, Rajasthan, India
^e Biometrics and Statistics Unit, Crop Informatics Lab., International Maize and Wheat Improvement Center (CIMMYT) Apdo. Postal 6-641, C.P. 06600, D.F. Mexico
^f Dep. of Genetics and Plant Breeding, Institute of Agricultural Sciences, Banaras Hindu Univ., Varanasi 221005, India

View larger version (24K): [in this window] [in a new window]   Figure 1. Dendrogram of 18 environments based on five temperature parameters (seventh week after planting [7WM], mean minimum temperature before anthesis [BAMN], mean maximum temperature before anthesis [BAMX], mean minimum temperature after anthesis [AAMN], and mean maximum temperature after anthesis [AAMX]) analyzed by Ward's incremental sum of squares method. The table superimposed on the graph contains mean values of temperature variables for Environment Group I (EnvGr-I), Environment Group II (EnvGr-II), and Environment Group III (EnvGr-III). Letters used in superscripts (a, b, c) indicate significance of difference in mean values at p > 0.05 as revealed by post hoc test.

View larger version (20K): [in this window] [in a new window]   Figure 2. Sites regression model biplot of GxE interaction of 25 wheat genotypes (1–25) across 18 environments shown in Table 2.

View larger version (19K): [in this window] [in a new window]   Figure 3. Biplot based on partial least squares analysis of GxE interaction for 25 genotypes tested in 18 environments showing the relationship between genotype, environment, and genotypic variables. Genotypic variables are days to anthesis (DA), days to maturity (DM), plant height (PH), biomass at harvest (BM), thousand grain weight (TGW), grains per spike (GPS), grain weight per spike (GWS), grain growth duration (GGD), single grain weight (SGW), and harvest index (HI).

View larger version (24K): [in this window] [in a new window]   Figure 4. Biplot based on partial least squares analysis of GxE interaction for 25 genotypes tested in 18 environments showing the relationship between genotype, environment, and environmental variables. Environmental variables are mean maximum temperatures of seventh week after planting (7WM), mean minimum temperature before anthesis (BAMN), mean maximum temperature before anthesis (BAMX), mean minimum temperature after anthesis (AAMN), and mean maximum temperature after anthesis (AAMX).