TY - JOUR
T1 - Generation and scavenging of reactive oxygen species in wheat flag leaves under combined shading and waterlogging stress
AU - Li, Huawei
AU - Cai, Jian
AU - Liu, Fulai
AU - Jiang, Dong
AU - Dai, Tingbo
AU - Cao, Weixing
PY - 2012
Y1 - 2012
N2 - Wheat (Triticum aestivum L.) plants were subjected to combined waterlogging and shading (WS) at 0-7, 8-15, 16-23 and 24-31 days after anthesis (DAA). WS at 0-7, 8-15, 16-23 and 24-31 DAA caused a yield loss of 17.18%, 14.98%, 7.93% and 7.05%, respectively. These losses were related to reductions in post-anthesis photoassimilate accumulation and 1000-kernel weight. WS reduced net photosynthetic rate (Pn), the maximum efficiency of PSII photochemistry under dark adaptation, actual photosynthetic efficiency and the photochemical quenching coefficient, but increased the quantum yield of quenching. WS caused enhanced concentrations of malondialdehyde and H 2O2, and an increased superoxide anion release. Superoxide dismutase and catalase activity were stimulated at 4 days after the onset of WS at 0-7 and 8-15 DAA, but decreased at 8 days after the onset of WS at 0-7, 8-15 and -DAA. Ascorbate peroxidase,glutathione reductase, dehydroascorbate reductase and monodehydroascorbate reductase activity increased during 08 days after the onset of WS at 0-7, 8-15 and 16-23 DAA. At 16-24 DAA, Pn), the level of reactive oxygen species and activity of the antioxidative enzymes fully recovered in plants subjected to WS at 07 DAA, but only partially recovered under WS at 8-15 DAA. Expression of the photosythesis-responsive genes RcaB and Cab, and the antioxidative enzyme-related genes Mn-SOD, Cu/Zn-SOD, CAT and GR were consistent with the performance of Pn and the activity of the antioxidative enzymes.
AB - Wheat (Triticum aestivum L.) plants were subjected to combined waterlogging and shading (WS) at 0-7, 8-15, 16-23 and 24-31 days after anthesis (DAA). WS at 0-7, 8-15, 16-23 and 24-31 DAA caused a yield loss of 17.18%, 14.98%, 7.93% and 7.05%, respectively. These losses were related to reductions in post-anthesis photoassimilate accumulation and 1000-kernel weight. WS reduced net photosynthetic rate (Pn), the maximum efficiency of PSII photochemistry under dark adaptation, actual photosynthetic efficiency and the photochemical quenching coefficient, but increased the quantum yield of quenching. WS caused enhanced concentrations of malondialdehyde and H 2O2, and an increased superoxide anion release. Superoxide dismutase and catalase activity were stimulated at 4 days after the onset of WS at 0-7 and 8-15 DAA, but decreased at 8 days after the onset of WS at 0-7, 8-15 and -DAA. Ascorbate peroxidase,glutathione reductase, dehydroascorbate reductase and monodehydroascorbate reductase activity increased during 08 days after the onset of WS at 0-7, 8-15 and 16-23 DAA. At 16-24 DAA, Pn), the level of reactive oxygen species and activity of the antioxidative enzymes fully recovered in plants subjected to WS at 07 DAA, but only partially recovered under WS at 8-15 DAA. Expression of the photosythesis-responsive genes RcaB and Cab, and the antioxidative enzyme-related genes Mn-SOD, Cu/Zn-SOD, CAT and GR were consistent with the performance of Pn and the activity of the antioxidative enzymes.
U2 - 10.1071/fp11165
DO - 10.1071/fp11165
M3 - Journal article
SN - 1445-4408
VL - 39
SP - 71
EP - 81
JO - Australian Journal of Plant Physiology
JF - Australian Journal of Plant Physiology
IS - 1
ER -