Evaluation of Local and Multinational Maize Hybrids for Tolerance Against High Temperature using Stress Tolerance Indices
Evaluation of Local and Multinational Maize Hybrids for Tolerance Against High Temperature using Stress Tolerance Indices
Saleem Ur Rahman1, Muhammad Irfan Yousaf1*, Mozammil Hussain2, Khadim Hussain1, Shahid Hussain1, Muhammad Husnain Bhatti1, Dilbar Hussain1, Aamir Ghani1, Abdul Razaq1, Muhammad Akram1, Iqra Ibrar1, Muhammad Shakeel Ahmad1, Shoaib Anwar Kohli3, Muhammad Abubakar Siddiq4
ABSTRACT
The current study was conducted to evaluate maize hybrids for their high temperature tolerance ability based on their performance as assessed through different high temperature stress indices. Nine maize hybrids were screened under optimal and high temperature stress conditions (late sowing) for three consecutive spring seasons (Spring 2017-18, 2018-19 and 2019-20), laid out under split-split-plot design under RCBD. Results reveled significant differences among stress indices for all three seasons and both conditions. Correlation analysis indicated that some high temperature stress indices i.e., STI, MP, GMP and HARM had a strong positive correlation with kernel yield under normal (Yp) and high temperature stress conditions (Ys). Biplot analysis further unveiled that two local maize hybrids i.e., YH-5507 and YH-5427 were the most productive, stable and heat tolerant while YH-5532, P-1543 and NK-8711 showed poor performance under high temperature stress conditions as compared to normal sowing. High temperature stress indices could be efficiently used to screen heat tolerant genotypes.
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