Cruz de Carvalho, M. H. and Laffray, D. and Louguet, P. (1998) Comparison of the physiological responses of Phaseolus vulgaris and Vigna unguiculata cultivars when submitted to drought conditions. Environmental and Experimental Botany, 40 (3). pp. 197-207.
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Abstract
Three cultivars differing in their susceptibility to water stress were compared—Phaseolus vulgaris cv. Carioca (susceptible), Vigna unguiculata cv. IT83D (intermediately tolerant) and V. unguiculata cv. EPACE-1 (tolerant)—during an imposed water stress treatment. Variation in leaf gas exchange (i.e. assimilation and stomatal conductance) and leaf relative water content in response to progressive substrate water depletion were investigated. To verify the extent of the injury caused by the drought treatment, leaf gas exchange was measured after rehydration. In the three cultivars, stomatal conductance declined before leaf relative water content was affected. P. vulgaris showed the largest decrease in the rate of stomatal conductance with decreasing substrate water content compared to both V. unguiculata cultivars. Photosynthetic assimilation rates were largely dependent on stomatal aperture, but there was evidence of the participation of non-stomatal factors in the reduction of CO2 fixation. The response of leaf gas exchange parameters to severe water stress conditions differed significantly between P. vulgaris and V. unguiculata cultivars. After rehydration, cultivars can be characterised according to the degree of injury induced by the drought treatment: V. unguiculata cv. EPACE-1 as the least affected, V. unguiculata cv. IT83D slightly affected and P. vulgaris cv. Carioca strongly affected. Similar ranking was obtained with experiments previously performed at a cellular and subcellular level. Our results confirm the utility of physiological parameters as early screening tools for drought resistance in bean cultivars.
| Item Type: | Article |
|---|---|
| Additional Information: | The authors wish to thank L. Espindola-Darvenne for her help with the measurements of leaf gas exchange. Gratitude is due to Prof. Vieira da Silva and J. Cardoso-Vilhena for critical discussion and help. This work was supported by a grant from the ‘Centre d’Etude Re´gional pour l’Ame´lioration de l’Adaptation a` la Se´cheresse’- CERAAS, Bambey–Se´ne´gal (Program STD3-UED6 XII). |
| Uncontrolled Keywords: | Drought; Net assimilation rate; Pennisetum americanum; Phaseolus vulgaris; Stomatal conductance; Vigna unguiculata |
| Author Affiliation: | Laboratoire de Physiologie Végétale, Université Paris Val de Marne, Avenue du Général De Gaulle, 94010 Créteil, France |
| Subjects: | Plant Production |
| Divisions: | General |
| Depositing User: | Mr Siva Shankar |
| Date Deposited: | 03 May 2012 07:47 |
| Last Modified: | 03 May 2012 07:47 |
| Official URL: | http://dx.doi.org/10.1016/S0098-8472(98)00037-9 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/5068 |
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