QueryDate : 2016-12-24
Cites : 6
| ORIGINAL
ARTICLE |
| | | Data source : Google Scholar QueryDate : 2016-12-24 Cites : 6 |
The
ability of plants to tolerate drought conditions is crucial for plant
survival and crop production worldwide. The present data confirm
previous findings reported existence of a strong relation between
abscisic acid (ABA) content and amino acid accumulation as response
water stress which is one of the most important defense mechanism
activated during water stress in many plant species. Therefore, free
amino acids were measured to determine any changes in the metabolite
pool in relation to ABA content. The ABA defective mutants of
Arabidopsis plants were subjected to leaf dehydration for Arabidopsis
on Whatman 3 mm filter paper at room temperature while, tomato mutant
plants were subjected to drought stresses for tomato plants by
withholding water. To understand the signal transduction mechanisms
underlying osmotic stress-regulating gene induction and activation of
osmoprotectant free amino acid synthesizing genes, we carried out a
genetic screen to isolate Arabidopsis mutants defective in ABA
biosynthesis under drought stress conditions. The present results
revealed an accumulation of specific free amino acid in water stressed
tissues in which majority of free amino acids are increased especially
those playing an osmoprotectant role such as proline and glycine.
Drought stress related Amino acids contents are significantly reduced
in the mutants under water stress condition while they are increased
significantly in the wild types plants. The exhibited higher
accumulation of other amino acids under stressed condition in the
mutant plants suggest that, their expressions are regulated in an ABA
independent pathways. In addition, free amino acids content changes
during water stress condition suggest their contribution in drought toleration as common compatible osmolytes.
