Acidification of roots and tolerance against oxidative stress of wheat (Triticum aestivum) under saline conditions
Muhammad Atiq-ur-Rahman, Muhammad Saqib, Javaid Akhtar and Rashid Ahmad
Journal Title:Scholarly Journal of Agricultural Science (SJAS)
This solution culture study has been conducted to investigate the antioxidant activity and rhizosphere acidification of salt tolerant and salt sensitive wheat genotypes under salt stress conditions. At the time of harvest physical growth parameters were recorded and ionic composition was determined from dried, ground and digested material of shoot and root. The eaf samples were collected and processed for the determination of antioxidant enzymes. The activities of antioxidant enzymes including SOD, POD and CAT were determined, rhizosphere acidification involving determination of ash alkalinity and release of organic acids in root exudates were also determined. Both the genotypes showed positive co-relations between the amount of Na+ present in them and the activities of antioxidant enzymes. Ash alkalinity also showed a positive co-relation with Na+ concentration for both genotypes. An increase in the release of organic acids was observed under salt stress, tolerant genotype (25-SAWSN-12) showed better growth under salt stress as compared to sensitive genotypes (25-SAWSN-8) by accumulating less Na+ and Cl-, and more K+ in it. Salt tolerant genotypes should be grown in saline areas as they release more organic acids and thus lower the pH of roots making more nutrients available under salt stress.
Key words: Acidification, Oxidative stress, tolerance, wheat, Triticum aestivum.