Harnessing Stress Tolerance Indices for the Identification of Heat-Resilient Khapli Wheat Germplasm

Pavan K Naik PAVAN KUMAR NAIK N; Jyoti Kumari; Shashidhar B Reddappa Shashidhar B Reddappa; Sudhir Navathe Sudhir Navathe; K. J. Yashavanthakumar K. J. Yashavanthakumar; Preeti Jakhar Preeti Jakhar

doi:10.56093/ijas.v96i11.180846

Authors

Pavan K Naik Indian Agricultural Research Institute
Jyoti Kumari ICAR-National Bureau Of Plant Genetic Resources
Shashidhar B Reddappa Vivekananda Parvatiya Krishi Anusandhan Sansthan
Sudhir Navathe Agharkar Research Institute
K. J. Yashavanthakumar Agharkar Research Institute
Preeti Jakhar Food Legumes Research Platform- International Center for Agricultural Research in the Dry Areas, Amlaha-466113, Madhya Pradesh, India and ICAR-National Bureau of Plant Genetic Resources, New Delhi-110012, India

https://doi.org/10.56093/ijas.v96i11.180846

Keywords:

Dicoccum wheat, Correlation analysis, Tolerant, Heat stress, MGIDI

Abstract

A total of 175 dicoccum wheat germplasm lines were evaluated across two rabi seasons of 2021–22 and 2022–23 at both Delhi and Pune locations under timely and late-sown conditions following alpha lattice design. Grain yield-based estimation of eight heat stress tolerance indices revealed substantial genetic variability among genotypes, with TOL, SSI, PYR, and YSI identified as reliable indicators of heat tolerance. Pearson’s correlation analysis showed that SSI and PYR were negatively associated with grain yield under heat stress (Ys), while STI, MP, GMP, and TOL were positively associated with yield under both timely and heat-stress conditions. Principal component revealed that PC1 (63.2%) was associated with Yp, Ys, MP, GMP, STI, YI, and TOL, indicating their usefulness in identifying high-yielding and heat-tolerant genotypes, whereas PC2 (36.2%) was associated with SSI and PYR, identifying heat-susceptible genotypes. Cluster analysis grouped the genotypes into three major clusters comprising 78, 18 and 79 genotypes, respectively. Factor analysis further confirmed the importance of Yp, Ys, MP, GMP, STI, and YI in selecting superior genotypes, and MGIDI identified 29 promising genotypes at 15% selection intensity. The genotypes G52 (EC06910) is an exotic collection originated from USA. G150 (IC138471, NP-123) and G97(IC534587, PI-248991) germplasm collected from India exhibited the lowest values for SSI, TOL and PYR along with the higher values for YSI, YI. MP, GMP and STI indicating superior heat stress tolerance and yield stability suggesting their potential use as donor parents in heat stress breeding programs

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