Differential responses of phenolic compounds of Brassica napus under drought stress.

Abstract

<span style="font-size: medium;"><span style="font-family: Calibri;"><span lang="EN-MY">This work evaluated the effect of drought stress on seedling growth, protein, soluble sugars, and phenolic compounds of </span><span lang="EN-MY">two cultivars of canola (RGS003 and Sarigol).</span><span lang="EN-MY"> Drought stress was induced with polyethylene glycol (PEG) at 0, 5, 10, and 15%. </span><span lang="EN-MY">Drought stress increased root fresh weight in both cultivars and the effect of drought was more pronounced in RGS003. Shoot fresh weight reduced in Sarigol at 10 and 15% of PEG. Drought stress significantly increased</span></span></span><span lang="EN-MY"> s</span><span style="font-size: medium;"><span style="font-family: Calibri;"><span lang="EN-MY">eedling fresh weight in RGS003. </span><span lang="EN-MY">Sarigol </span><span lang="EN-MY">accumulated higher amounts of protein as compared to </span><span lang="EN-MY">RGS003. </span><span lang="EN-MY">At all PEG concentrations, the soluble sugars content</span><span lang="EN-MY">was higher in Sarigol as compared to control</span></span></span><span lang="EN-MY">.</span><span style="font-size: medium;"><span style="font-family: Calibri;"><span lang="EN-MY"> Total phenol content was enhanced at higher drought level (15%) while flavonol content increased at lower level (5%) in both cultivars. </span><span lang="EN-MY">Phenylalanine ammonia-lyase (PAL) activity and its relative expression were increased</span></span><span style="font-family: Calibri;"><span lang="EN-MY">in RGS003 at 10% of PEG. </span><span lang="EN-MY">Overall, </span><span lang="EN-MY">RGS003 cultivar had</span><span lang="EN-MY"> more capacity to tolerate drought stress than Sarigol cultivar.</span></span></span><br /> <strong><span lang="EN-MY"><span style="font-family: Calibri; font-size: medium;"> </span></span></strong><br /> <span><span style="font-family: Calibri; font-size: medium;"> </span></span><br /> <span style="font-family: Calibri;"><span style="font-size: medium;"><span>.</span></span></span>