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10.12816/ejpb.2019.256164

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The experiment was conducted during the three successive seasons, i.e. 2015/16 to 2017/18 at El-Matanaa, Agricultural Research Station, Agricultural Research Center, Egypt, to assess heat tolerance of 12 bread wheat genotypes under nine environments (three sowing dates with three years). The experiment was grown in a randomized complete block design (RCBD) with three replications in each environment. The objectives of t, no. of spikes m-2, no. of kernels spike-1, 1000-kernel weight and grain yield in the second and third planting dates across the three seasons by an average of (10.24 &18.00), (24.48 & 48.80), (21.97 & 51.22), (21.61& 37.75) and (24.39 & 41.99%), respectively, compared with the recommended sowing date. The joint regression analysis of variance for the studied traits showed highly significant mean squares due to environment + genotype × environment interactions revealing that genotypes considerably interac, which reveals genetic variability among genotypes for linear response to varying environments. Stability parameters (bi and S2d) revealed that seven genotypes were stable for days to heading, eight for number of spikes/m2, four for number of kernels/spike and three for 1000-kernel weight. Six out of the twelve studied genotypes, i.e, Giza 171, Misr 2, Gemmeiza 11, Line #8, Line #10 and Line #11 showed non-significant deviation from regression and their regression coefficient values were close to unity which is classified as stable genotypes for grain yield. Three genotypes had grain yield higher than the grand mean (Gi, Misr 2 and Line #10) and could be considered the most stable genotypes. The genotypes Misr 2, Gemmeiza 11 and Line #12 showed heat Susceptibility Index less than one and were considered tolerant to heat stress

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23

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1

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36340

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1110-7863

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2735-3885

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https://ejpb.journals.ekb.eg/article_256164.html

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https://ejpb.journals.ekb.eg/service?article_code=256164

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Egyptian Journal of Plant Breeding

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https://ejpb.journals.ekb.eg/