THE INFLUENCE OF SALIN STRESS ON TOTAL WATER CONTENTAT THE FOLIARY LEVEL AND PH OF THE SOIL TO SOME BEAN GENOTYPES FROM NORTH-EASTERN ROMANIA PUBLISHED

Beatrice Alexandra MODIGA, Mihaela COVAȘĂ, Cristina SLABU, Alina Elena MARTA, Carmenica Doina JITĂREANU modigabeatricealexandra@yahoo.com
Salinity is one of the most important abiotic factors, which results in a significant reduction in yield of crop plants.This study was based on the analysis of the effect of excess NaCl on water content and water forms (free water, bound water and total water) and soil pH, to 7 bean genotypes sensitive to salts collected from saline soils from North-Eastern Romania (Iasi, Vaslui and Botosanicounties).The overall objective of the study is to contribute to a better understanding of the physiological mechanisms involved in the saline stress intoleranceof the species Phaseolus vulgaris L. and the identification of salinity tolerant cultures.The results showed that, after 30 days of treatment, the pH of the soil has changed due to the application of saline solutions.Thus, by passing the pH from neutral to alkaline, there was a reduction in the permeability of cell membranes, inhibiting the absorption of soil water.The determinations of the water forms in the analyzed plants show that the bound water has higher values for the 200 mM NaCl treated group,to all the genotypes studied, which denotes the salinity resistance of the studied populations,due to the fact that the bound water content increases the biological resistance to dehydration induced by physiological drought,which consists of the difficulty of absorbing the water at a high external osmotic pressure.In particular, the Blăgeşti 2 and Trusesti 2 genotypes have been highlighted, indicating a high tolerance biological capacity,which is explained by the fact that mineral salts and organic acids reduce the intensity of sweating. The data was analyzed by calculating the correlation coefficient with Microsoft Excel.
pH, soil, total water, Phaseolus vulgaris L.
Biology applied in Agriculture
Presentation: poster

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