The effect of salinity on accumulation proline, glycine betaine and mineral elements in four varieties of tomatoes
Abstract
K.M. Derkaoui*, M. Sahnoune and M. Belkohodja
Salinity of soil and water, is one of the major abiotic factors limiting plant productivity and crop yields. Interest in morphological and biochemical characteristics of adaptation to environmental stresses cultivated plants has attracted the attention of many researchers. In this interest and in order to compare the salt sensitivity of tomatoes, we have carried out analyzes are carried out on four varieties of tomatoes (Marmande, Aicha, Heinz1573, Cerise), subjected to different concentration (0 mM, 70 mM, 145 mM to 200 mM). Our results show that the salt stress in a depressive effect on the growth of the tomatoes, and the four genotypes have different reactions toward the increasing doses of NaCl. The synthesis of proline reaches an average rate of the order of 0.7563 mg/ml at 200 mM with Marmande variety. At the aerial level, glycine betaine has a beneficial effect on the achievement of osmotic adjustment which has reached a high content of the order of 1.79 mg/ml at 200 mM of Nacl in the leaves of tomatoes. In addition, salt stress affected the mineral composition by increasing the leaf content of Na+, but the rate of K+ and Ca+2 decreased significantly K+ until 173, 72 mg/g PSF and Ca+2 until 62 mg/g PSF respectively from control to 200 mM.