Drought Strategy Tolerance of Four Barley Cultivars and Combined Effect with Salicylic Acid Application

Abstract

This investigation was conducting to explain that four barley genotypes varied in their drought tolerance according to their genotype and their tested organs. It can be recorded that growth parameters (fresh, dry matter and length, water content, leaf area and pigment contents) were decreased as decreasing M. C. in the soil. This indicated that Giza 123 was the superior in its drought tolerance and Giza 129 was the interior and both cv. Giza 2000 and cv. Giza 124 were the intermediated between them. This concomitant with increase in soluble sugar and soluble protein content of both organs in Giza 123 and shoot Ca ++ , this related with lower value of OP other than genotypes, in Giza 2000 this was related with a huge accumulation in soluble protein of shoot and root, shoot amino acids and root proline reach 3-folds than control plants as decreasing M. C. Whereas drought stress increased soluble protein only in Giza 124 while in Giza 129 decreasing M. C. increased soluble protein, amino acids and proline contents in shoot and root and shoot Ca ++ . The values of OP increased as decreasing M. C. in four barley cultivars concomitant with their drought tolerance. Also, SA application was markedly enhanced the production of growth parameters in shoot and root with varied degree according to each tested barley genotypes. SA application was significantly increased OP in shoot, root and spike of barley pants. Spraying vegetative parts with 0.5 mM SA was markedly increased the soluble sugar, soluble protein and amino acids in shoot, root and spike of four barley cultivars. On the other side, SA application lowered the accumulation of proline in shoot and root of barley genotypes. SA treatment induced no significant change in K + , Ca ++ , and Mg ++ in shoot, root and spike of Giza 123, it significantly increased K + , Ca ++ , and Mg ++ in shoot and root of Giza 2000. SA application enhanced accumulation of K + , Ca ++ in shoot and root of Giza 124 and K + , Ca ++ and Mg ++ in three organs of Giza 129.