Physiological traits related to terminal drought resistance in common bean (Phaseolus vulgaris L.)

Authors

  • Miguel A Rosales,

    1. Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa CP 62210, Cuernavaca, Morelos, Mexico
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    • These authors contributed equally to this work.

  • Sonia M Cuellar-Ortiz,

    1. Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa CP 62210, Cuernavaca, Morelos, Mexico
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    • These authors contributed equally to this work.

    • Current address: Plant Pathology Department, UC Davis, 354 Hutchison Hall, Davis, CA 95616-8680, USA.

  • María de la Paz Arrieta-Montiel,

    1. Plant Science Initiative, University of Nebraska. Lincoln, NE 68588-0660, USA
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  • Jorge Acosta-Gallegos,

    1. INIFAP Campo Experimental Bajío, Km 6.5 Carretera, Celaya-San Miguel de Allende S/N Roque, Celaya, Guanajuato, Mexico
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  • Alejandra A Covarrubias

    Corresponding author
    1. Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa CP 62210, Cuernavaca, Morelos, Mexico
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Alejandra A Covarrubias, Departamento de Biología Molecular de Plantas, IBT-UNAM, Av. Universidad 2001, Col. Chamilpa CP 62210, Cuernavaca, Morelos, Mexico. E-mail: crobles@ibt.unam.mx

Abstract

BACKGROUND: A major problem in common bean (Phaseolus vulgaris L.) agriculture is the low yield due to terminal drought. Because common beans are grown over a broad variety of environments, the study of drought-resistant genotypes might be useful to identify distinctive or common mechanisms needed for survival and seed production under drought.

RESULTS: In this study the relationship between terminal drought resistance and some physiological parameters was analysed using cultivars contrasting in their drought response from two different gene pools. Trials were performed in three environments. As expected, drought treatments induced a decrease in leaf relative humidity and an increase in leaf temperature; however, when these parameters were compared between susceptible and resistant cultivars under optimal irrigation and drought, no significant differences were detected. Similar results were obtained for chlorophyll content. In contrast, analysis of relative water content (RWC) and stomatal conductance values showed reproducible significant differences between susceptible and resistant cultivars grown under optimal irrigation and drought across the different environments.

CONCLUSIONS: The data indicate that drought-resistant cultivars maximise carbon uptake and limit water loss upon drought by increasing stomatal closure during the day and attaining a higher RWC during the night as compared with susceptible cultivars, suggesting a water balance fine control to achieve enough yield under drought. Copyright © 2012 Society of Chemical Industry

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