PJB-2017-733
Molecular and biological reactions of wheat (Triticum aestivum) affected by abscisic acid in response to drought stress
Jing Yang
Abstract
Natural drought is currently a main environmental pressure that puts heavy restriction on crop yield under the general trend of global warming. While plants are dealing with various environmental pressures, the abscisic acid (ABA) in them emerges as an important functional factor. Our study aimed to explore the mechanism of ABA when the wheat is facing exotification and anti-oxidation metabolism in its root under drought-stress circumstance. Significant increase of the ABA content in wheat’s roots was observed after the pretreatment of ABA under drought stress, which lifted the inhibitions of both wheat growth and its nitrogen fixation activity that were imposed by drought. The ABA treatment induced hydrogen-peroxide (H2O2) content reduction in crops under drought stress. After the treatment of ABA in drought conditions, we witnessed a boost in the activities of antioxidant enzymes in plants including superoxide dismutase (SOD), peroxidase (POD), ascorbate peroxidase (APX), catalase (CAT), and glutathione-disulfide reductase (GSR), meanwhile the oxidative degradation of lipids was weakened. These indicated that ABA served as a signal transduction molecule in the anti-oxidation metabolism activation process in plants’ roots. Furthermore, ABA treatment also helped to elevate the levels of both spermidine (SPD) and spermine (SPM) in the same drought setting. On the whole, application of ABA facilitated wheat’s nitrogen fixation, which consequently resulted in its higher drought tolerance. The common polyamines (SPD and SPM) mediated root antioxidant induction that may be involved in ABA-induced anti-stress response.
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