| Autor: |
Yousaf, Muhammad Irfan, Bhatti, Muhammad Hussain, Maqbool, Muhammad Amir, Ghani, Aamir, Akram, Muhammad, Ibrar, Iqra, Khan, Amjad, Khan, Rana Abdul Hameed, Kohli, Shoaib Anwar, Siddiq, Muhammad Abu Bakar, Khalid, Muhammad Umer |
| Předmět: |
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| Zdroj: |
Pakistan Journal of Agricultural Sciences; 2021, Vol. 58 Issue 5, p1511-1521, 11p |
| Abstrakt: |
Heat stress is one of the major causes of low kernel yield of maize in Pakistan as compared to other countries like United State of America, Turkey, Canada, Argentina and China. To overcome this problem, the current study was designed to evaluate heat stress induced responses in maize hybrids for morpho-physiological and kernel quality related traits. The research was conducted at Maize and Millets Research Institute (MMRI), Yusafwala, Pakistan for three consecutive spring seasons (2017, 2018 and 2019). Maize hybrids were sown under two heat regimes: (i) normal sowing and (ii) sowing under heat stress (late sowing) for each spring seasons. Results revealed highly significant (P<0.05) differences among maize hybrids for kernel yield and related traits under both conditions and for all three seasons. Moreover, 11% to 36% reduction in kernel yield was observed during heat stress compared to normal sowing. Highest average percentage reduction was observed in local hybrid YH-5532 (28.7%) followed by all the three multinational hybrids NK-8711 (27.3%), P-1543 (23.4%) and DK-6724 (21.2%), respectively. This reduction in kernel yield was attributed to the reduction in thousand kernel weight (4.8% to17.2%), number of kernels per ear (4.7% to 13.3%), net photosynthetic rate (11% to 24.9%) and shelling percentage (up to 4.7%) as revealed by biplot analysis. Biplot analysis further unveiled that two local maize hybrids YH-5507 and YH-5427 were the most productive and heat tolerant hybrids under both conditions and for three consecutive seasons. Therefore, these hybrids are recommended general cultivation especially in heat prone areas. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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