[Effects of exogenous nitric oxide on photosynthetic characteristics of poplar leaves under water stress].
Nitric oxide (NO) is an active molecule involved in many biological pathways, but its effects on photosynthesis of tree leaves have not been established yet. This paper studied the effects of exogenous NO, sodium nitroprusside (SNP), on the water status, photosynthesis and scavenging enzyme activities in poplar leaves. Different levels of SNP treatments had remarkable effects on the water content of leaves, which increased with increasing SNP levels. When the SNP level exceeded 500 micromol x L(-1), differences in leaf water content were no longer significant between different SNP treatments. Exogenous NO increased the photosynthesis rate, photochemical efficiency of PSII Fv/Fm, and Fm/Fo and Fv/Fo ratios, and the effects decreased with increasing duration of water stress. The SOD and POD activities in poplar leaves were higher in 1 hour water stress treatment than in 3 h treatment. Treating with SNP could markedly increase POD activity, but SOD activity did not change much. POD and SOD activities increased initially, and then decreased with increasing SNP levels. The results indicated that exogenous NO delayed the accumulation of active oxygen by increasing POD and SOD activities, and thereby, alleviated the effects of water stress on photosynthetic organization of poplar leaves.
Wang
Miao
M
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. wangmiao@iae.ac.cn
Li
Qiurong
Q
Fu
Shilei
S
Dong
Baili
B
D009569:Nitric Oxide; D010788:Photosynthesis; D018515:Plant Leaves / Q000502:physiology; D032107:Populus / Q000254:growth & development / Q000502:physiology*; D014867:Water
D014867:Water; D009569:Nitric Oxide