Abstract
Present study was conducted to characterise ten rice genotypes based on antioxidant response. Five genotypes were adapted to transplanting conditions (PR 116, PAU 201, Punjab Mehak 1, PR 115 and PR 120) and five to aerobic conditions (Feng Ai Zan, UPLRi-7, Vandana, IR 71701-28-1-4 and MAS-946) were raised in pots for 18 days. Differential response of various antioxidative enzymes, viz., ascorbate peroxidase (APX), catalase (CAT), peroxidase (POX), glutathione reductase (GR) and contents of hydrogen peroxide (H2O2), proline, ascorbate and α-tocopherol, and levels of lipid peroxidation were estimated in shoots of genotypes. Higher activities of APX, CAT, POX, GR paralleled with higher contents of ascorbate, α-tocopherol, proline, and lower levels of lipid peroxidation and hydrogen peroxide content in cultivars adapted for transplanted conditions indicated their better scavenging ability. Cultivars PR 115, PR 120 and Feng Ai Zan performed better under aerobic conditions as revealed by higher SOD activity along with high contents of antioxidants indicating enhanced ROS scavenging ability. Our results highlights that ROS scavenging ability hold great potential in identifying and developing genotypes adapted for aerobic and transplanted conditions.
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