Physiological response of cowpea [Vigna unguiculata (L.) Walp.] genotypes to water deficit under lysimeter conditions and agronomical performance in field conditions

    Abdou, H and Falalou, H and Oumarou, H and Achirou, B F and Yacoubou, B (2019) Physiological response of cowpea [Vigna unguiculata (L.) Walp.] genotypes to water deficit under lysimeter conditions and agronomical performance in field conditions. IOSR Journal of Agriculture and Veterinary Science, 12 (7). pp. 22-33. ISSN 2319-2380

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    Abstract

    Cowpea is the main food legume grown in Niger. Its low yield is mainly due to drought stress occurring at any stage of plant development. This study aims to (i) assess the intermittent and terminal water deficit effects on agro-physiological parameters and (ii) identify relevant traits useful in breeding programs to select high yielding and drought tolerant genotypes. Field and lysimeter experiments were conducted at ICRISAT Sahelian Centre in Niger. For lysimeter experiment, three water treatments were imposed: well-water (BI), intermittent water deficit (DH1) and terminal water deficit (DH2). The results showed significant negative effects of DH1 and DH2 on investigated parameters. Thus, the seed weight decreases up to 54% and 53% due to DH1 and DH2 respectively. These stress reduced transpiration efficiency (TE) by 15% and 13% respectively, and harvest index (HI) by 38% and 26% respectively. For the genotypic variation, the highest seed weight decrease was observed on Tiligré (85% and 78% under DH1 and DH2 respectively) while IT98K-1111-1 showed the lowest seed weight decrease (28% and 17% under DH1 and DH2 respectively). Our results showed that yield variation is mainly explained by the number of matured pods, TE and HI. IT98K-1111-1 and IT96D-610 with highest TE and HI revealed drought tolerant whereas high transpiration was observed in drought sensitive genotypes. The field trial confirmed agronomical trend observed in lysimeter studies.

    Item Type: Article
    Divisions: Research Program : West & Central Africa
    CRP: CGIAR Research Program on Grain Legumes and Dryland Cereals (GLDC)
    Uncontrolled Keywords: Cowpea, Water Deficit, Physiological and Agronomic Parameters, Tolerance, Food legumes
    Subjects: Others > Cowpea
    Others > Plant Physiology
    Others > Legume Crops
    Depositing User: Mr Ramesh K
    Date Deposited: 11 Jul 2019 08:44
    Last Modified: 12 Jul 2019 05:51
    URI: http://oar.icrisat.org/id/eprint/11154
    Official URL:
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: This article in French Language
    Links:
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