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.