Relationship between photo-inhibition of photosynthesis and reactive oxygen species in leaves of poplars suffering root osmotic stress

Abstract

Abstract: To know more about the photo inhibition of photosynthesis under field conditions, its relationship with reactive oxygen species (ROS) in leaves of poplar clone seedlings was studied under osmotic stress conditions. With the increasing duration of osmotic stress and the enhancement of stress intensity, the ROSlevel, malondialdehyde (MDA) content, and superoxide dismutase (SOD) activity increased, while the activities of catalase (CAT) and ascorbate peroxidase (APX) decreased, resulted in the unbalanced ROSmetabolism and intensified photo inhibition. The inhibition of SODactivity by copper diethyldithiocarbamate or the accelerated generation of O₂^ˉ. with methyl viologen (MV) could also induce the photo inhibition. The decrease of the ability of poplar clone seedlings in scavenging H₂O₂ under osmotic conditions limited the dissipation of excess light energy and the role of photosynthetic apparatus in protecting against photo inhibition through Mehler reaction. Photo inhibition might be related to the accumulation of ROS.

Key words: Poplar clone seedlings, Osmotic stress, Photo inhibition of photosynthesis, Reactive oxygen species, Protecting enzymes

CLC Number:

Q945

FENG Yulong, ZHANG Yajie, ZHU Chunquan. Relationship between photo-inhibition of photosynthesis and reactive oxygen species in leaves of poplars suffering root osmotic stress[J]. Chinese Journal of Applied Ecology, 2003, (8): 1213-1217.

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