STUDIES REGARDING THE INTERDEPENDENCE BETWEEN THE CITOGENETIC ASPECTS AND THE APLICATION OF STRESS FACTORS OVER THE TISSUES CULTIVATED “IN VITRO” AT TOMATOES
TINA OANA CRISTEA 1, GABRIEL ALIN IOSOB 1, MARIA PRISECARU 2 1. Vegetable Research and Development Station Bacau, Romania; e-mail: tinaoana@yahoo.com
2. „Vasile Alecsandri”, University of Bacau, Faculty of Science, Department of Biology, Marasesti Street, no. 157, Bacau, Romania, e-mail: prisecaru_maria@yahoo.com
Tomato (Lycopersiconesculentum Mill) is an important member of the Solanaceaefamily due to its spread cultivation worldwide. The tomato is a diploid plant with 2n=2x=24 chromosomes. The tomato genome has been implemented to be used as a model for theSolanaceae family because of its short production period, simple diploid genetic structure, small genome size and the availability of both molecular breeding methodologiesand a wide diversity of genetic resources [2]. Due to its high food value the consumers request and the producers interesates is continuously increasing.In the same time, tomatoes production is affected by different types of stresses by both biotic and abiotic stress. Among biotic stress tomatoes are affected by intensive diseases caused by viruses, fungi, bacteria and also nematodes. The abiotic stresses, namely environmental stresses pose a tremendous pressure on the growth and production of crops [9]. Among them, the most agressive one are salinity of soil, high temperature and draught. Its vulnerability to insect and pest attacks is one of the factor causing the expand of production costs. Now-a-days the climatic changes dramatically increase the impact of all these biotic and abiotic stresses over the effectiveness of tomatoes production, which led to an intensification of plant molecular and in vitro breeding focused on the improvement ofstress tolerance of crops. The objective of this study was to asses the impact of salt stress over the citogenetics of tomatoes plants cultivated in vitro on media suplimented with different concentration of NaCland KCl(100, 200, 300 mM).
