【摘要】 在增强UV-B辐射下,以3年生兴安落叶松幼苗为实验材料,研究了外源NO供体硝普钠(Sodium nitro-prusside,SNP)对幼苗的光合色素(Chla、Chlb和Car)和叶绿素荧光参数的影响。方差分析结果表明0.5 mmol.L-1的SNP对增补UV-B胁迫下的兴安落叶松幼苗产生显著影响。0.5 mmol.L-1的SNP能够显著抑制增补UV-B辐射后光合色素、Fv/Fm、ΦPSⅡ、Fv’/Fm’和qP的明显下降以及Chla/Chlb、Fo和NPQ的升高。表明了外源NO能够减轻UV-B辐射胁迫下兴安落叶松幼苗光合反应中心的生理损伤,从而增强兴安落叶松幼苗对增补UV-B辐射胁迫环境的适应能力。更多还原

【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.更多还原