Role of active transport of potassium to leaves in the mechanisms of tolerance to salinity in common bean (Phaseolus vulgaris L.)

  • Sugenith ARTEAGA Universitat Politècnica de València, Institute for the Conservation and Improvement of Valencian Agrodiversity (COMAV), Camino de Vera s/n, 46022 Valencia
  • Monica BOSCAIU Universidad Politécnica de Valencia
  • Jaime PROHENS Universitat Politècnica de València, Institute for the Conservation and Improvement of Valencian Agrodiversity (COMAV), Camino de Vera s/n, 46022 Valencia
  • Oscar VICENTE Universitat Politècnica de València, Institute for the Conservation and Improvement of Valencian Agrodiversity (COMAV), Camino de Vera s/n, 46022 Valencia
Keywords: bean cultivars; potassium transport; proline; salt stress; sodium exclusion


Biochemical markers are of great utility in screening for salt tolerance of crops. In common beans (Phaseolus vulgaris), lower levels of proline under stress have been associated with a better stress resistance of cultivars. In the present study, the responses to salinity have been analysed in six cultivars of common beans: four local landraces from Spain and two experimental lines from Cuba. Proline was used for ranking the relative tolerance of the cultivars, confirming a previous study which reported as more stress-tolerant two of the Spanish landraces. Total soluble sugars concentrations varied with treatments and between genotypes, but it was difficult to assess their role in stress tolerance of the analysed plants. Sodium concentration in leaves was the lowest in one of the two salt-resistant cultivars, and potassium did not vary or even increased under salt stress in all of them, except for the most susceptible one, where a drop of this cation was registered under 150 mM NaCl. Changes in malondialdehyde (MDA) contents did not indicate salt-induced membrane peroxidation resulting from secondary oxidative stress; consequently, accumulation of total phenolic compounds and flavonoids, as an antioxidant defence mechanism, was not detected. These results highlight the reliability of using proline as a biochemical marker of salt stress in common beans and the importance of the mechanism related to potassium transport to leaves in conferring stress tolerance to some common bean cultivars.


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How to Cite
ARTEAGA, S., BOSCAIU, M., PROHENS, J., & VICENTE, O. (2020). Role of active transport of potassium to leaves in the mechanisms of tolerance to salinity in common bean (Phaseolus vulgaris L.). Notulae Scientia Biologicae, 12(2), 447-459.
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