DREB1A allows for more water uptake in groundnut by a large modification in the root/shoot ratio under water deficit

    Vadez, V and Rao, S and Sharma, K K and Bhatnagar-Mathur, P and Devi, M J (2007) DREB1A allows for more water uptake in groundnut by a large modification in the root/shoot ratio under water deficit. Journal of SAT Agricultural Research, 5 (1). pp. 1-5.

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    Abstract

    High water uptake, efficient conversion of water into biomass and high harvest index are the key components of the yield architecture (Passioura 1977), in particular under conditions where water deficit is common. The International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) has been involved for many years in the development of groundnut (Arachis hypogaea) breeding lines having high water use efficiency (WUE), assessed by its major component, evapotranspiration efficiency (TE), because WUE has been identified as a major contributor to pod yield under intermittent water deficit conditions (Wright et al. 1993, 1994). However, a trait-based approach using surrogates of TE as selection criteria to select genotypes with high TE has not proved more successful than a yield-based approach where lines are selected based on yield under water deficit (Nigam et al. 2005). Partly it might be because of the insufficiently strong correlation between TE and its surrogates (Krishnamurthy et al., in press). It may also be explained by a reported negative link between TE and the harvest index (HI), ie, genotypes with high TE usually had low HI (Wright et al. 1991). These results demonstrate that each component of the yield architecture cannot be addressed independently from the other.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Subjects: Mandate crops > Groundnut
    Depositing User: Library ICRISAT
    Date Deposited: 27 Oct 2011 05:22
    Last Modified: 27 Oct 2011 05:22
    URI: http://oar.icrisat.org/id/eprint/2578
    Official URL:
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: UNSPECIFIED
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