NITRIC OXIDE MITIGATES WATERLOGGING STRESS BY REGULATING. ANTIOXIDATIVE DEFENSE MECHANISM IN MAIZE (ZEA MAYS L.) ROOTS

作者：Jaiswal Akanksha^*; Srivastava J P

来源：Bangladesh Journal of Botany, 2016, 45(3): 517-524.

• Zea mays
• Waterlogging
• Antioxidative enzymes
• Nitric oxide
• Sodium nitroprusside

Twenty days old pot grown seedlings of two genotypes of maize viz., HUZM-265 (waterlogging resistant) and HUZM-55 (waterlogging susceptible) were subjected to root zone waterlogging supplemented with 50, 500 and 2000 mu mol/l sodium nitroprusside (SNP) as a donor of NO. Levels of reactive oxygen scavenging enzymes and non-enzymes were quantified in terminal root portions at 0, 1, 3, 5 and 7 days after waterlogging. As in waterlogged plants of resistant genotype there was significant increase in the levels of reactive oxygen species (ROS) scavenging enzymes viz., catalase (CAT), peroxidase (PDX), superoxide dismutase (SOD), ascorbate peroxidase (APX). Malondialdehyde (MDA) and H2O2 levels also increased in waterlogged plants, but increment was more in susceptible genotype. Levels of ascorbic acid and phenols decreased in waterlogged plants. Supplementing root zone solution of waterlogged plants with SNP was effective in ameliorating activities of ROS scavenging enzymes at relatively lower concentration (50 mu mol/l in resistant genotype than in susceptible genotype. Higher concentration of SNP (2000 mu mol/l) was deleterious for plants. Results indicated that NO played a role in enhancing tolerance to waterlogging stress at its lower concentration.

• 出版日期2016-9