Alleviation of oxidative stress induced by drought stress through priming by β-aminobutyric acid (BABA) in Rapeseed (Brassica napus L.) plants.

Abstract

<span style="font-family: Calibri;"><span style="font-size: medium;"><span lang="EN-MY">The objective of this study was to investigate the role of β-aminobutyric acid(BABA) (0, 300µM) in reduction of oxidative damages in leaves and roots of <em>Brassica napus</em> L. under drought stress (0, -0.2, -0.4 MPa)</span><span lang="AR-SA" dir="RTL">.</span></span><span lang="EN-MY"><span style="font-size: medium;"> β-aminobutyric acid was investigated as an internal regulator hormone and its role in defense<span> </span>mechanisms against biotic and abioticstresses. In this study, BABA pretreatment prevented drought induced decrease in K</span>^{<span style="font-size: small;">+</span>}<span style="font-size: medium;"> content and increase in lipid peroxidation and H</span>_{<span style="font-size: small;">2</span>}<span style="font-size: medium;">O</span>_{<span style="font-size: small;">2</span>}<span style="font-size: medium;"> content. Mild and severe drought stress increased leaf and root MDA and other aldehydes content. In BABA pretreated plants under stress, leaf and root MDA and other aldehydes content significantly decreased as compare to drought condition.In addition, in drought stressed plants non-enzymatic antioxidants [GSH] were elevated over the control and BABA pretreatment increased GSH content. The Na</span>^{<span style="font-size: small;">+</span>}<span style="font-size: medium;"> and K</span>^{<span style="font-size: small;">+</span>}<span style="font-size: medium;"> concentration increased under mild and severe drought stress. On the basis of the results, BABA-treated plants exhibited enhanced drought tolerance.</span></span></span>