Identification of bread wheat (Triticum aestivum L.) genotypes tolerant to heat and low N stress

El-Karamity, A.E.; Salem, M. A.; Naguib,, S.R.; Ibrahim, Sabah M.; Fouad, H.M.

doi:10.21608/svuijas.2024.305437.1380

Identification of bread wheat (Triticum aestivum L.) genotypes tolerant to heat and low N stress

Document Type : Original Article

Authors

Agronomy Department, Faculty of Agriculture, Minia University, 61519 Minia, Egypt.

10.21608/svuijas.2024.305437.1380

Abstract

To identify the heat and low N-stress tolerant bread wheat genotypes, fifteen genotypes were evaluated in early, recommended and late dates under low and recommended N fertilizer rates. The experiments were carried out during the two seasons of 2021/2022 and 2022/2023 at the experimental farm of the Faculty of Agriculture, Minia University. Significant differences (P≤0.05 or 0.01) of sowing dates, N levels, genotypes, and their interactions were found for the most studied traits in the two seasons. Early and late sowing dates resulted in a reduction in the most studied traits compared to the recommended sowing date. Low N fertilization caused a reduction in all studied traits compared to the recommended N level except the harvest index. For grain yield under low N, Misr2 recorded the lowest heat stress sensitivity index HSI followed by lines 8, 20, 4, and 13, indicating tolerance to heat stress. Misr2 gave the highest grain yield on the late sowing date with low N. Line 15, Giza168, and Gemmieza12 could be sowing on the late date when providing recommended N fertilization to compensate for the late sowing date. Based on all N stress tolerance indices, lines 14, 15, 24, and 34 on the early sowing date, lines 13, 17, 24, and 34 on recommended sowing date, lines 13, 17, 24, and Misr2 on the late sowing date were the most N-stress tolerant genotypes.

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