Large variation in salinity tolerance in chickpea is explained by differences in sensitivity at the reproductive stage

    Vadez, V and Krishnamurthy, L and Serraj, R and Gaur, P M and Upadhyaya, H D and Hoisington, D A and Varshney, R K and Turner, N C and Siddique, K H M (2007) Large variation in salinity tolerance in chickpea is explained by differences in sensitivity at the reproductive stage. Field Crops Research, 104 (1-3). pp. 123-129. ISSN 0378-4290

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    Abstract

    Salinity is an ever-increasing problem in agriculture worldwide, especially in South Asia (India, Pakistan) and Australia. Improved genotypes that are well adapted to saline conditions are needed to enhance and sustain production in these areas. A screening of 263 accessions of chickpea, including 211 accessions from ICRISAT's mini-core collection (10% of the core collection and 1% of the entire collection), showed a 6-fold range of variation for seed yield under salinity (1.9 L of 80 mM NaCl per 7.5 kg Vertisol), with several genotypes yielding 20% more than a previously released salinity tolerant cultivar. The range of variation in yields under salinity was similar in both kabuli and desi chickpeas, indicating that breeding for salinity tolerance can be undertaken in both groups. A strong relationship (r2 = 0.50) was found between the seed yield under salinity and the seed yield under a non-saline control treatment, indicating that the seed yield under salinity was explained in part by a yield potential component and in part by salinity tolerance per se. Seed yields under salinity were therefore computed to separate the yield potential component from the residuals that accounted for salinity tolerance per se. Among the genotypes evaluated, desi genotypes had higher salinity tolerance than kabuli genotypes. The residuals were highly correlated to the ratio of seed yield under salinity to that of the control, indicating that both parameters can be used to assess salinity tolerance. A similar ratio was calculated for shoot dry weight at 50 days after sowing. However, no significant correlation was found between the shoot dry weight ratio and the yield ratio, indicating that differences in salinity tolerance among genotypes could not be inferred from measurements in the vegetative stage. The major trait related to salinity tolerance was the ability to maintain a large number of filled pods, whereas seed size was similar in tolerant and sensitive genotypes. Salinity tolerance was not related to the shoot Na+ or K+ concentrations.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Uncontrolled Keywords: Chickpea, Cicer arietinum, Salinity tolerance, Seed yield, Large screening, Mini-core collection
    Subjects: Mandate crops > Chickpea
    Depositing User: Mr Sanat Kumar Behera
    Date Deposited: 14 Oct 2011 10:11
    Last Modified: 23 Jan 2012 08:25
    URI: http://oar.icrisat.org/id/eprint/2525
    Official URL: http://dx.doi.org/10.1016/j.fcr.2007.05.014
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: ICRISAT and the Council of Grain Grower Organisations (COGGO), Australia, supported this study. Authors are thankful to the constant support of COGGO in this work on salinity. Expert technical assistance of Mr. N. Jangaiah, ICRISAT, is also greatly acknowledged.
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