Assessing Genetic Variability for Root Traits and Identification of Trait-Specific Germplasm in Chickpea Reference Set

Lalitha, N and Upadhyaya, H D and Krishnamurthy, L and Kashiwagi, J and Kavikishor, P B and Singh, S (2015) Assessing Genetic Variability for Root Traits and Identification of Trait-Specific Germplasm in Chickpea Reference Set. Crop Science, 55 (-). 01-12. ISSN 1435-0653

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Abstract

Chickpea (Cicer arietinum L.) is a major grain legume cultivated largely on residual soil moisture in the arid and semiarid regions of the world. Terminal drought stress is one of the major causes of yield loss, and a deep root system has been recognized as one of the most important traits for enhancing drought adaptability. To diversify the current genetic base of root traits, the present study explored the variation for root traits in the reference set of chickpea (n = 300) germplasm. Genetic variability for root traits at 35 d after sowing was assessed using a polyvinyl chloride (PVC) cylinder culture system in two postrainy seasons. Largest genetic variability was observed for dry weights of shoot (broad-sense heritability [h2] = 0.69–0.74) and root (h2 = 0.52–0.70). For root-length density (h2 = 0.42–0.43) and root/total-plant dry-weight ratio (h2 = 0.32–0.54), h2 values were moderate but the variation was large, indicating scope for selection. The performance of the reference set accessions was identified for each of key traits. Accessions with the best root-length densities along with root and shoot dry weights were found to originate from the Mediterranean region and western Asia emphasizing the importance of whole collection from these regions for superior root traits. This study identified 23 new accessions for widening the parental base in further drought tolerance breeding efforts and identified superior traits in already adapted genetic backgrounds.

Item Type: Article
Divisions: RP-Grain Legumes
CRP: CGIAR Research Program on Grain Legumes
Uncontrolled Keywords: Chickpea, Germplasm, Breeding, Genetics, Legumes
Subjects: Mandate crops > Chickpea
Others > Genetics and Genomics
Depositing User: Mr Ramesh K
Date Deposited: 07 Mar 2016 10:37
Last Modified: 21 Oct 2016 06:39
URI: http://oar.icrisat.org/id/eprint/9367
Official URL: http://dx.doi.org/10.2135/cropsci2014.12.0847
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: The technical support of Mr. Md. Yusuf, Tirupathi Reddy and J. Shankaraiah during the cylinders experiment is gratefully acknowledged.
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