论文部分内容阅读
目的:探索不同光强条件(23%,45%,63%,78%,100%自然光强)对老鸦瓣生长发育及光合特性的影响,从而确定适宜老鸦瓣生长的光强。方法:于盛果期测量各处理老鸦瓣叶面积及生物量指标;统计各处理植株开花结果比例;采用LI-6400XT型便携式光合作用测定系统测量叶片光合基本参数、光响应曲线,并进一步计算出响应曲线特征参数;采用LI-6400XT配套的荧光叶室测定叶片叶绿素荧光参数。结果:23%光强及全光照处理的植株生物量显著低于其余各处理而78%光强处理植株生物量最高。随着光照强度的降低,老鸦瓣结果率下降,败育率升高;光饱和点(LSP)和光补偿点(LCP)都显著降低,而表观量子效率(AQY)升高。23%,45%光强处理下净光合速率显著低于其他处理,但表观量子效率高于其他处理;全光照和78%光强处理的净光合速率最高且二者差异不显著。78%光强处理下Fv/Fm,Fv’/Fm’,ΦPSⅡ,ETR,qP均最高。结论:老鸦瓣对光强的适应范围较广,但78%左右光强最适宜老鸦瓣生长。
Objective: To explore the effects of light intensity (23%, 45%, 63%, 78%, 100% natural light intensity) on the growth and photosynthetic characteristics of Laohala petals, and to determine the light intensity suitable for the growth of Laohala petals. Methods: The leaf area and biomass index of Populus euphratica in each stage were measured at the full fruit stage. The proportion of flowering and fruiting of each plant was calculated. The basic photosynthetic parameters and light response curve of leaf were measured by LI-6400XT portable photosynthesis system and further calculated Response curve characteristic parameters; leaf chlorophyll fluorescence parameters of LI-6400XT supporting fluorescence leaf chamber. Results: The biomass of plants treated with 23% light intensity and total light was significantly lower than that of the rest of the treatments, while the biomass of 78% light-stressed plants was the highest. With the decrease of light intensity, the result rate of Populus davidiana decreased and the rate of abortion increased. The light saturation point (LSP) and light compensation point (LCP) decreased significantly while the apparent quantum yield (AQY) increased. The net photosynthetic rate under 23% and 45% light intensity treatments was significantly lower than those under other treatments, but the apparent quantum yield was higher than other treatments. The net photosynthetic rate was the highest and the difference was insignificant at full light and 78% light intensity. Fv / Fm, Fv ’/ Fm’, ΦPSⅡ, ETR and qP under 78% light intensity were the highest. Conclusion: Populus petal has a wide range of light intensity adaptation, but about 78% of the light intensity is most suitable for the growth of Laoara petal.