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Open AccessArticle

Screening for Salt Tolerance in Four Local Varieties of Phaseolus lunatus from Spain

1
Institute for Plant Molecular and Cellular Biology (UPV-CSIC), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
2
The New Zealand Institute for Plant & Food Research, Auckland 1025, New Zealand
3
Hayleys Agro Farms (Pvt) Limited, Hayleys Agriculture Holdings 25, Foster Lane, Colombo 10, Sri Lanka
4
Laboratory for Plant Breeding and Conservation of Genetic Resources, Bioplant Center, University of Ciego de Avila, 69450 Ciego de Ávila, Cuba
5
Mediterranean Agroforestry Institute, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
*
Author to whom correspondence should be addressed.
Agriculture 2018, 8(12), 201; https://doi.org/10.3390/agriculture8120201
Received: 30 October 2018 / Revised: 6 December 2018 / Accepted: 13 December 2018 / Published: 15 December 2018
(This article belongs to the Special Issue Response and Tolerance of Agricultural Crops to Salinity Stress)
This study assessed the responses of four local Spanish cultivars of Phaseolus lunatus (lima bean) to moderate salinity. For three weeks, plants were exposed to increasing salinity (50–150 mM NaCl) under greenhouse conditions. At the end of the experiment, several growth and biochemical parameters were determined. Salt stress reduced the fresh weight of aerial organs, allowing us to rank the four genotypes according to their tolerance to salinity. The concentration of most photosynthetic pigments remained unaltered, except carotenoids that were reduced in the least salt-tolerant cv. (cultivar) VPH-79. Leaf Na+ and Cl concentrations increased with increased salt concentration of irrigation water, but K+ either remained constant, as in the most tolerant ‘BGV-15410’, or increased in the other cultivars, resulting in an unchanged K+/Na+ ratio under stress in two of the selected cultivars. Moreover, proline increased in all cultivars, most notably in cv. VPH-79, with the highest absolute concentrations registered in the more salt tolerant cultivars. Interestingly, these cultivars already had a relatively higher proline concentration in non-stressed plants. These findings indicate that P. lunatus is moderately salt tolerant and that its main mechanisms to adjust to salinity stress are the maintenance of high concentrations of K+ and proline accumulation in leaves. View Full-Text
Keywords: lima bean; salt tolerance; growth parameters; ionic homeostasis; osmolytes; proline lima bean; salt tolerance; growth parameters; ionic homeostasis; osmolytes; proline
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MDPI and ACS Style

Arteaga, S.; Al Hassan, M.; Chaminda Bandara, W.M.; Yabor, L.; Llinares, J.V.; Boscaiu, M.; Vicente, O. Screening for Salt Tolerance in Four Local Varieties of Phaseolus lunatus from Spain. Agriculture 2018, 8, 201.

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