2-Cys Prx plays a critical role in scavenging H 2 O 2 and protecting photosynthetic function in leaves of tobacco seedlings under drought stress

[摘要] Drought stress led to a decrease in PSII photochemical activity in tobacco leaves and the blockage of electron transfer, especially from Q A to Q B on PSII acceptor side. In addition, drought stress caused a dramatic increase in H 2 O 2 and MDA contents. However, the overexpression of 2-Cys Prx significantly reduced the H 2 O 2 accumulation in tobacco seedlings and alleviated the degree of oxidative damage under drought stress. It also improved stomatal limitation and net photosynthetic rate of tobacco seedlings and reduced its PSII photoinhibition under drought stress which promoted the ability of PSII electron transfer.

[学科分类] 纳米科学和纳米技术

[关键词] 2-Cys Prx;overexpression;tobacco;photosynthetic characteristics;chlorophyll fluorescence;reactive oxygen species (ROS)