†These authors contributed equally to this work.
Physiological traits related to terminal drought resistance in common bean (Phaseolus vulgaris L.)
Article first published online: 2 JUL 2012
Copyright © 2012 Society of Chemical Industry
Journal of the Science of Food and Agriculture
Volume 93, Issue 2, pages 324–331, 30 January 2013
How to Cite
Rosales, M. A., Cuellar-Ortiz, S. M., de la Paz Arrieta-Montiel, M., Acosta-Gallegos, J. and Covarrubias, A. A. (2013), Physiological traits related to terminal drought resistance in common bean (Phaseolus vulgaris L.). J. Sci. Food Agric., 93: 324–331. doi: 10.1002/jsfa.5761
- Issue published online: 12 DEC 2012
- Article first published online: 2 JUL 2012
- Manuscript Accepted: 10 MAY 2012
- Manuscript Revised: 22 FEB 2012
- Manuscript Received: 26 JUL 2011
- common bean;
- drought resistance;
- water balance;
- Phaseolus vulgaris;
- relative water content;
- stomatal conductance
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