Large genetic variation for heat tolerance in the reference collection of chickpea (Cicer arietinum L.) germplasm

Krishnamurthy, L and Gaur, P M and Basu, P S and Chaturvedi, S K and Tripathi, S and Vadez, V and Rathore, A and Varshney, R K and Gowda, C L L (2011) Large genetic variation for heat tolerance in the reference collection of chickpea (Cicer arietinum L.) germplasm. Plant Genetic Resources : Characterization and Utilization, 9 (1). pp. 59-69.

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Chickpea is the third most important pulse crop worldwide. Changes in cropping system that necessitate late planting, scope for expansion in rice fallows and the global warming are pushing chickpeas to relatively warmer growing environment. Such changes demand identification of varieties resilient to warmer temperature. Therefore, the reference collection of chickpea germplasm, defined based on molecular characterization of global composite collection, was screened for high temperature tolerance at two locations in India (Patancheru and Kanpur) by delayed sowing and synchronizing the reproductive phase of the crop with the occurrence of higher temperatures ($358C). A heat tolerance index (HTI) was calculated using a multiple regression approach where grain yield under heat stress is considered as a function of yield potential and time to 50% flowering. There were large and significant variations for HTI, phenology, yield and yield components at both the locations. There were highly significant genotypic effects and equally significant G £ E interactions for all the traits studied. A cluster analysis of the HTI of the two locations yielded five cluster groups as stable tolerant (n ¼ 18), tolerant only at Patancheru (n ¼ 34), tolerant only at Kanpur (n ¼ 23), moderately tolerant (n ¼ 120) and stable sensitive (n ¼ 82). The pod number per plant and the harvest index explained $60% of the variation in seed yield and $49% of HTI at Kanpur and $80% of the seed yield and $35% of HTI at Patancheru, indicating that partitioning as a consequence of poor pod set is the most affected trait under heat stress. A large number of heat-tolerant genotypes also happened to be drought tolerant.

Item Type: Article
Uncontrolled Keywords: climate change; harvest index; heat tolerance index; high temperature; shoot biomass
Agro Tags: <b>Agrotags</b> - tolerance | yields | chickpeas | developmental stages | biological phenomena | crops | sowing | genotypes | planting | farms <br><b>Fishtags</b> - NOT-AVAILABLE<br><b>Geopoliticaltags</b> - india | delhi | marches | gujarat | andhra pradesh
Subjects: Mandate crops > Chickpea
Depositing User: Siva Shankar
Date Deposited: 19 May 2011 06:34
Last Modified: 16 Oct 2011 07:18
Official URL:
Funders: Government of India - Ministry of Agriculture - Department of Agriculture and Cooperation
Acknowledgement: This work was funded by the Department of Agriculture and Cooperation, Ministry of Agriculture, Government of India through the Integrated Scheme of Oilseeds, Pulses, Oil palm and Maize. The technical help of Mr J. Shankaraiah, Research Technician, ICRISAT and Mr Raghubanshi Singh, Miss Rinki and Mr Pankaj Kumar Singh, IIPR, Kanpur in conducting the field experiments is sincerely acknowledged.
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