摘要
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:Present study was conducted to explore the growth and photosynthetic characteristics of Tulipa edulis under different light conditions(23%,45%,63%,78%,100% of full sunlight) and to determine the optimum light intensity for growth of T.edulis.Method:The leaf area and biomass indicators as well as reproductive characteristics were measured.The photosynthetic basic parameters and light response curve were determined by a LI-6400XT portable photosynthesis system,and the light response curve characteristic parameters was determined.Additionally,chlorophyll fluorescence parameters were determined by assorted fluorescence leaf chamber of LI-6400XT.Result:The lowest biomass yield was observed in the 23% and 100% of full sunlight treatments while the highest value was found under the 78% of full sunlight conditions.With the reduction of light availability,the success rate of sexual reproduction,light saturation point(LSP) and light compensation point(LCP) reduced,while apparent quantum yield(AQY) increased.23% and 45% of full sunlight treatments led to lower photosynthesis rate(Pn) and higher apparent quantum yield(AQY) in comparison with other treatents.The highest photosynthesis rate was observed in the 78% and 100% of full sunlight treatments.In addition,78% of full sunlight treatments led to highest Fv/Fm,Fv'/Fm',ΦPSⅡ,ETR,and qP.Conclusion:T.edulis was able to adapt in a wide range of light intensity,and 78% of full sunlinght was the most suitable light condition for growth of T.edulis.
出处
《中国中药杂志》
CAS
CSCD
北大核心
2012年第4期442-446,共5页
China Journal of Chinese Materia Medica
关键词
老鸦瓣
光强
生长发育
光合基本参数
光响应曲线
叶绿素荧光
Tulipa edulis
light intensity
growth
photosynthetic basic parameters
light response curve
chlorophyll fluorescence
