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IDENTIFICATION OF HEAT STRESS TOLERANT SPRING WHEAT GENOTYPES VIA YIELD-INFLUENCING CHARACTERISTICS

. Kashif Rashid, Muhammad Omer Farooq, Muhammad Amin, Muhammad Sajjad Saeed, Muhammad Amir Amin, Amer Hussain, Javed Anwar Shah, Babar Islam and Gulfam Riasat


Abstract

The present investigation utilized heat stress indicators to evaluate 50 wheat varieties cultivated in both normal and heat stress conditions. It was observed that heat stress significantly hinders the performance of all varieties when planted late, leading to reduced yields. Correlation coefficient analysis, PCA, and biplot assessments revealed a strong positive link between indices such as STI, MP, GMP, HM, and MRP with potential and stress yields (Yp and Ys), whereas TOL and SSPI demonstrated a negative correlation with Ys. Cluster analysis employed the same heat stress tolerance indices (STI, MP, GMP, HM, and MRP) to categorize the varieties as either heat tolerant or sensitive. Consequently, these indices proved to be superior in predicting which high-yield varieties are desirable under both conditions. Hence, these stress indicators may offer more effective methods for selecting genotypes that can withstand high temperatures from both environments. Through the contribution of these various indices, certain genotypes specifically 9452, 9521, 9707, and 9522 were pinpointed as tolerant and high performing in both settings. Therefore, these heat resilient varieties could serve as valuable genetic assets in programs aimed at agricultural advancement.

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