Vol. 7, Issue 2 (2019)
Assessment of genetic diversity for terminal heat tolerance in bread wheat (Triticum aestivum L. em. Thell.) under very late sown condition
Author(s): Santosh, JP Jaiswal, Anupama Singh and Naveen Chandra Gahatyari
Abstract: Heat stress in wheat bears very high significance in realsing yield potential of a genotype. Terminal heat stress in particular affects the wheat yields considerably. Keeping this in view the present investigation was carried out with 32 diverse genotypes of bread wheat in completely randomized block design with 3 replications at G.B. Pant University of agriculture & Technology, Pantnagar for studying the genetic diversity for terminal heat stress tolerance under very late sown condition. The observations were recorded on 16 agronomic traits and 3 physiological traits. The statistical analysis for genetic divergence was done using Mahalanobis-D2 statistics and clustering of genotypes was done using Tocher method. On the basis of genetic diversity analysis, it was found that grain yield/plot and minimum by CTD-IV. Clustering of genotypes revealed that cluster-III had maximum number of genotype followed by cluster-I, cluster-II, cluster-IV, cluster-V and cluster-VI. The highest inter-cluster distance was observed between cluster-IV and VI while lowest inter-cluster distance was observed between cluster-I and II. The highest intra-cluster distance was observed in cluster-III revealing maximum genetic divergence among its constituents while lowest intra-cluster distance was observed in cluster-VI. The five genotypes were found tolerant to heat stress. The genotypes bearing desired values from different clusters can be exploited in future breeding programme for improving the yield and physiological traits under very late sown condition for mitigating the threat of terminal heat stress in bread wheat.
Fig. 1: Percent contribution of different characters towards genetic divergence
Fig. 2: Clustering of Genotypes by Tocher Method.
Pages: 297-303 | 417 Views 55 Downloads
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How to cite this article:
Santosh, JP Jaiswal, Anupama Singh, Naveen Chandra Gahatyari. Assessment of genetic diversity for terminal heat tolerance in bread wheat (Triticum aestivum L. em. Thell.) under very late sown condition. Int J Chem Stud 2019;7(2):297-303.
