E-ISSN 2564-615X
Research Article
Comparative analysis of drought responses in Phaseolus vulgaris (common bean) and P. coccineus (runner bean) cultivars
1 Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València (UPV-CSIC), 46022 Valencia, Spain; Faculty of Horticulture, University of Agricultural Sciences and Veterinary Medicine (USAMV), 400372 Cluj-Napoca, Romania  
2 Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València (UPV-CSIC), 46022 Valencia, Spain; present address: The New Zealand Institute for Plant & Food Research Ltd, Auckland, New Zealand  
3 Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València (UPV-CSIC), 46022 Valencia, Spain; Tervalis S.L., 44002 Teruel, Spain  
4 Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València (UPV-CSIC), 46022 Valencia, Spain.  
5 Instituto Agroforestal Mediterráneo, Universitat Politècnica de València (UPV), 46022 Valencia, Spain.  
Eurobiotech J 2017; 1: 247-252
DOI: 10.24190/ISSN2564-615X/2017/03.09
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Abstract

Genetic improvement of crop drought tolerance has become an urgent need for increasing agricultural yields and food production, to feed a growing human population in the context of global climate change. To get insights into the most relevant mechanisms underlying drought resistance in beans, we have analysed the responses to water deficit of three Phaseolus vulgaris (common bean) and one P. coccineus (runner bean) cultivars, focusing on the accumulation of specific osmolytes, a conserved response to abiotic stress in plants. Changes in osmolyte levels were correlated with the relative tolerance to water stress of thestudied cultivars. Drought tolerance in Phaseolus largely depends on the accumulation of myo-inositol; glycine betaine may also contribute to tolerance in P. coccineus (but not in P. vulgaris). Proline, another common osmolyte, is a reliable marker of the level of stress affecting bean plants, but is not directly involved in tolerance mechanisms, as its drought-dependent accumulation is lowest in the most tolerant cultivar. We suggest that, by measuring the levels of proline and myo-inositol in water-stressed plants, a large number of cultivars could be easily and rapidly screened to select promising candidates to be used in breeding programmes for improving drought tolerance in beans.

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