Stomatic conductance and chlorophyll content index and leaf area of some beans local cultivars from north-east of Romania, under salt stress

Abstract

Beans is a salt-sensitive species. For this reason, the purpose of the face work was to determine the effect of excess NaCl on the some physiological processes such as photosynthesis and transpiration. Research has focused on dynamics of the chlorophylle content index and foliar stomatic conductivity, in the case of 7 bean genotypes, as an indicator of salt stress tolerance.The biological material was represented by seven bean genotypes, collected from saline soils in the Moldavian region, in 2018 and exposed to salt stress over a 30-day period. They were constantly wetted with saline at a concentration of 100 mM and 200 mM NaCl. Stomatale conductance decrease is a mechanism of resistance to salinity as it prevents water loss from plants. As a response to osmotic component of salt stress to reduce transpiration stomata are partially closed, so we can conclude that genotypes Blăgeşti 2 shows better tolerance to osmotic stress, compared with other genotypes. After 30 days at 200 mM NaCl, the genotypes Blăgeşti 2, Blăgeşti 3, Blăgeşti 4 and Truşeşti 2 are superior to the control plants, indicating a good adaptation to intense photosynthetic rhythm. Saline stress influences stomatic conductivite foliar and chlorophylle content, causing significant differences between genotypes.