Root, Stem, and Leaf Ion Accumulation in Drought-Stressed Green Bean (Phaseolus Vulgaris L.) Genotypes Treated With Peg-6000

Abstract

The objective of this investigation was to determine the relationship between drought stress and the ion accumulation as well as distribution mechanisms of bean genotypes of the Phaseolus vulgaris L. species, namely, Gevas Bodur 64 (GB64), Samsun 100 (S100), Samsun 95 (S95), 4F-89F, Gevas Sink 57 (GS57), Gevas Sink 26 (GS26), Samsun 96 (S96), Sink Barbunya (SB), Kirkgunluk (KG), and Oturak Barbunya (OB), collected from various regions of Anatolia, Turkey. The seedlings of 10 different bean genotypes were cultivated in containers containing Hoagland's nutrient solution in a cultivation chamber, the climate conditions of which were kept under control. In order to generate drought stress, 10% (w/v) polyethylene glycol 6000 (PEG-6000), corresponding to an osmotic potential of -0.40 MPa, was added to the nutrient solution. After the application, the accumulation of potassium (K), calcium (Ca), iron (Fe), zinc (Zn), and manganese (Mn) ions in the roots, stems, and leaves of the plants was determined. There were differences among the genotypes in terms of ion uptake, ion accumulation, and ion distribution. It was concluded that plants protected themselves from negative effects of drought stress via balanced ion distribution among their organs.