%0 Journal Article %A * %A DUAN Xi-Hua %A GUO Xiao-Rui %A MENG Qing-Huan %A ZU Yuan-Gang %T Effect of Exogenous Nitric Oxide on Photosynthetic Pigments and Chlorophyll Fluorescence under Enhanced UV-B Radiation in Larix gmelinii %D 2013 %R 10.7525/j.issn.1673-5102.2013.02.010 %J Bulletin of Botanical Research %P 181-185 %V 33 %N 2 %X Under enhanced UV-B radiation, 3-year-old seedlings of Larix gmelinii were chose as target to study the impact of exogenous nitric oxide on photosynthetic pigments (Chl a, Chl b and Car) and chlorophyll fluorescence. The results of variance analysis showed 0.5 mmol·L-1 sodium nitroprusside (SNP), a NO donor, have significant impact on nursery stocks of L.gmelinii under enhanced UV-B radiation stress. 0.5 mmol·L-1 SNP can significantly inhibited the apparent decline in photosynthetic pigments, Fv/Fm, ΦPSⅡ,Fv′/Fm′ and qP, and the obvious increase in chl a/chl b, Fo and NPQ after supplement UV-B radiation. All these results indicated that exogenous nitric oxide could reduce the physical damage of photosynthetic reaction centers in seedlings of L.gmelinii under UV-B radiation stress, and enhancement of environmental adaptability of the seedling to supplementary UV-B radiation stress. %U https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2013.02.010