Alterations in photosynthesis and antioxidant enzyme activity in winter wheat subjected to post-anthesis water-logging

Abstract

Winter wheat (Triticum aestivum L.) cultivars Yangmai 9 (water-logging tolerant) and Yumai 34 (water-logging sensitive) were subjected to water-logging (WL) from 7 d after anthesis to determine the responses of photosynthesis and anti-oxidative enzyme activities in flag leaf. At 15 d after treatment (DAT), net photosynthetic rate under WL was only 3.7 and 8.9 μmol(CO 2 ) m -2 s -1 in Yumai 34 and Yangmai 9, respectively, which was much lower than in the control. Ratios of variable to maximum and variable to initial fluorescence, actual photosynthetic efficiency, and photochemical quenching were much lower, while initial fluorescence and non-photochemical quenching were much higher under WL than in control, indicating damage to photosystem 2. WL decreased activities of superoxide dismutase and catalase in both cultivars, and activity of peroxidase (POD) in Yumai 34, while POD activity in Yangmai 9 was mostly increased. The obvious decrease in the amount of post-anthesis accumulated dry matter, which was redistributed to grains, also contributed to the grain yield loss under WL.

Promotion of 5-aminolevulinic acid treatment on leaf photosynthesis is related with increase of antioxidant enzyme activity in watermelon seedlings grown under shade condition

“…The homogenate was centrifuged at 10 000×g for 20 min at 4 °C and the supernatant was collected as crude enzyme extraction (Tan et al 2008).…”

Temporal Changes in Biochemical and Antioxidant Enzymes Activities in Maize (Zea mays L.) under Waterlogging Stress during Early Growth Stage

“…POX and PPO enzymes are responsible for scavenging of H 2 O 2 produced under oxidative stress; therefore, these enzymes removed the excess H 2 O 2 more efficiently in resistant genotype and conferred resistance against waterlogging stress. The POX activity was also increased in wheat under waterlogging stress (Tan et al, 2008). Tang et al (2010) reported that the activity of POX was increased in maize genotype after 4th to 6th day of waterlogging stress as compared to their control plants.…”

Improved drought tolerance by early IAA- and ABA-dependent H2O2 accumulation induced by α-naphthaleneacetic acid in soybean plants

“…SOD activity was assayed by measuring the inhibition of nitro blue tetrazolium reduction according to the method of Wang et al (2012). CAT activity was determined by estimating the differential value between the original and residual H 2 O 2 in the reaction solution, according to the method of Tan et al (2008). APX activity was assayed by monitoring the rate of reduced ascorbate (AsA) oxidation at 290 nm and was calculated using an extinction coefficient of 2.8 mM -1 cm -1 , according to the method of Jiang and Zhang (2002).…”