| Summary: | Terminal heat stress has great impact on the quantity and quality of bread wheat that ultimately pose a serious concern
about the food security. The presence of the genetic variability and suitable selection criteria is imperative for screening
of genotypes for heat tolerance. Therefore, 60 advanced breeding lines and four standard checks were evaluated
for morpho-physiological traits under late sown condition to understand the importance of the principal component
analysis in reduction of the large correlated data into few major principal components that account for maximum
genetic variability. Out of twenty principal components, only three were retained having 67.10% contribution towards
total variability on the basis of eigen values and scree plot. Grain yield (0.995), days to heading (0.912) and plant
height (0.752) were having maximum positive loading in the first, second and third principal component respectively.
Therefore, principal component analysis holds great promise in the crop improvement programme.
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