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Bulletin of Botanical Research ›› 2013, Vol. 33 ›› Issue (2): 181-185.doi: 10.7525/j.issn.1673-5102.2013.02.010

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Effect of Exogenous Nitric Oxide on Photosynthetic Pigments and Chlorophyll Fluorescence under Enhanced UV-B Radiation in Larix gmelinii

MENG Qing-Huan;ZU Yuan-Gang;GUO Xiao-Rui;DUAN Xi-Hua;*   

  1. 1.Key Laboratory of Forest Plant Ecology of Northeast Forestry University，Ministry of Education，Harbin　150040；2.Engineering Research Center of Forest Bio-preparation，Ministry of Education，Northeast Forestry University，Harbin　150040
  • Received:1900-01-01 Revised:1900-01-01 Online:2013-03-20 Published:2013-03-20
  • Contact: DUAN Xi-Hua
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Abstract: 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.

Key words: photosynthetic pigments, chlorophyll fluorescence, UV-B radiation, Larix gmelinii

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