Imam, Z and Sultana, R and Parveen, R and Kumar, M and Nahakpam, S and Kumari, R and Kumari, J and Kohli, A and Singh, A K and Choudhary, A K and Bhadana, V P and Saxena, K B (2025) Assessment of heat tolerance indices and multivariate approaches for screening chickpea (Cicer arietinum L.) genotypes under field stress conditions. Plant Physiology Reports, 31. pp. 33-44. ISSN 2662-253X
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Abstract
Heat stress significantly affects chickpea growth, development, and productivity, making the identification of tolerant genotypes a key breeding priority. In the present study, thirty desi chickpea genotypes were evaluated over two years (2021–2022 and 2022–2023) in two different environments: timely sowing (non-stress) and late sowing (heat stress). A randomised complete block design (RCBD) with three replications was used to set up the experiments. Twelve parameters of heat tolerance Indices (TOL, STI, SSPI, YI, YSI, RSI, MP, GMP, HM, MRP, PYR, and HSI) and grain yield were analysed through ANOVA, correlation analysis, principal component analysis (PCA), biplot visualization, and hierarchical clustering. There was notable genotypic variance across all indices, with grain yield under stress (Ys) showing positive associations with STI, MP, YSI, GMP, HM, and YI, but negative associations with TOL, SSPI, RSI, and PYR. Strong interrelationships were recorded among MP, GMP, and YI, confirming their robustness as selection tools. PCA explained 99.28% of the total variance with two principal components, of which PC1 (66.64%) was strongly associated with Ys, YI, YSI, HM, and MRP, thereby identifying BRCHT-1, BRCHT-13, BRCHT-29, and IPC 11–20 as highly tolerant and stable genotypes. In contrast, BRCHT-20 and BRCHT-28 exhibited high values for TOL, SSPI, and PYR, reflecting susceptibility. Biplot analysis confirmed positive associations of Yp and Ys with MP, GMP, HM, and STI, while negative associations were evident with susceptibility indices. Hierarchical clustering grouped genotypes into five distinct clusters, with Cluster 2 showing superior tolerance (high Ys, STI, GMP, HM, and YSI), while Clusters 1 and 5 contained the most susceptible lines. Overall, this integrated analysis demonstrates that MP, GMP, HM, STI, and YSI are the most reliable indices for screening heat-tolerant chickpea genotypes, with BRCHT-1, BRCHT-13, BRCHT-18, BRCHT-29, IPC 11–20, and Sabour Chana-02 emerging as the most resilient candidates for future breeding programs.
| Item Type: | Article |
|---|---|
| Divisions: | Global Research Program - Accelerated Crop Improvement |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | Heat tolerance, Chickpea, PCA biplot analysis, Stress tolerance indices, Yield |
| Subjects: | Others > Crop Yield Mandate crops > Chickpea |
| Depositing User: | Mr Nagaraju T |
| Date Deposited: | 26 Mar 2026 06:11 |
| Last Modified: | 26 Mar 2026 06:11 |
| URI: | http://oar.icrisat.org/id/eprint/13569 |
| Official URL: | https://link.springer.com/article/10.1007/s40502-0... |
| Projects: | UNSPECIFIED |
| Funders: | UNSPECIFIED |
| Acknowledgement: | This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. |
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