Sources of tolerance to terminal drought in the chickpea (Cicer arietinum L.) minicore germplasm

Krishnamurthy, L and Kashiwagi, J and Gaur, P M and Upadhyaya, H D and Vadez, V (2010) Sources of tolerance to terminal drought in the chickpea (Cicer arietinum L.) minicore germplasm. Field Crops Research, 119. pp. 322-330.

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Abstract

Chickpea cropping system is largely rainfed and terminal drought is a major constraint to its productivity. Currently available drought tolerant chickpea genotypes are very few. Considering that a large number of traits are collectively needed to confer yield under drought, there is a need to identify more genotypes to introduce diversity in drought tolerance breeding programs. The minicore (n = 211) chickpea germplasm collection has been evaluated over three years for drought tolerance index (DTI), calculated as the standard residuals, through a regression approach considering drought yield as a function of days to flowering, yield potential and the residual or drought response, in the short season environment of South-India. The minicore collection accessions exhibited large range of variations for days to 50% flowering (26–78 d) and maturity (70–120 d), shoot biomass (1500–4940 kg ha−1) and seed yield (210–2730 kg ha−1) under drought. The heritability for the shoot biomass and seed yields under drought stress (shoot biomass 0.118–0.461; seed yield 0.511–0.795) were relatively higher than that under optimally irrigated environment (shoot biomass 0.232–0.447; seed yield 0.322–0.631). Both the seed yield under drought and DTI showed significant accession×year interaction. A categorization of the DTI using a cluster analysis has revealed five major groups with 5 accessions in highly tolerant group, 78 in tolerant, 74 in moderately tolerant, 39 in sensitive and 20 in highly sensitive groups. ICC 4958, a previously identified drought tolerant genotype, was among the moderately tolerant while Annigeri, a well-adapted cultivar, was in the tolerant group. Though the heritability of DTI was slightly lesser than that of the yield, the DTI represented terminal drought tolerance per se, and was independent of phenology and yield potential influences.

Item Type: Article
Divisions: UNSPECIFIED
CRPS: UNSPECIFIED
Agro Tags: <b>Agrotags</b> - drought | yields | tolerance | developmental stages | chickpeas | crops | irrigation | seasons | farms | drought stress <br><b>Fishtags</b> - pearls <br><b>Geopoliticaltags</b> - india | australia | france | western australia | usa | andhra pradesh
Subjects: Mandate crops > Chickpea
Depositing User: Library ICRISAT
Date Deposited: 16 Aug 2011 10:17
Last Modified: 16 Aug 2011 10:17
URI: http://oar.icrisat.org/id/eprint/212
Official URL: http://dx.doi.org/10.1016/j.fcr.2010.08.002
Projects: UNSPECIFIED
Funders: Government of Japan
Acknowledgement: This research was partly supported by the unrestricted funds from the Japanese Government earmarked for chickpea drought tolerance research and breeding in ICRISAT. The technical assistance provided in conducting the experiments and collection of data by Mr J. Shankaraiah, Senior Research Technician, Crop Physiology Lab is gratefully acknowledged
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