The influence of salt stress on stomatal conductance of some tomato local cultivars from N-E Romania

Abstract

The stomata are some of the most interesting structures of plants. They control transpiration and absorption of carbon dioxide, but also react both to light and to the internal water balance of plants. The research was conducted under greenhouse condition. The biological material was represented by six local tomatoes populations collected from areas with saline soils from Moldavia region and compared with commercial type salt-tolerant tomato. Tomato genotypes in the study were subjected to salt stress for a period of 30 days is constantly wetted with saline solution to a concentration of 100 mM and 200 mM. The stomatal conductance was determinated whit a porometru. By direct measurements on leaves can learn important information on plant water stress, photosynthetic capacity or gas exchange with the atmosphere (O2/CO2). As a response to osmotic stress salt component to reduce transpiration stomata are partially closed. Stomata movements are affected by the osmotic effect of salt stress.