摘要
目的研究建泽泻叶片光合特性及其与环境因子的相互关系。方法利用LI-6400型便携式光合测定仪,测定建泽泻叶片的净光合速率日变化、环境因子日变化以及光响应。结果建泽泻叶片净光合速率(Pn)与气孔导度(Gs)光合日变化呈双峰曲线,蒸腾速率(Tr),胞间CO2浓度(Ci)及气孔限制值(Ls)日变化呈单峰曲线,水分利用率(WUE)呈单谷型曲线。相关性分析表明,建泽泻叶片Pn与主要影响因子光合有效辐射(PAR),Gs,Tr,大气温度(Ta)和WUE呈正相关,与空气相对湿度(RH),Ci和Ls呈负相关。结论建泽泻为气孔限制型阳生植物,Pn存在明显的"光合午休"现象,气孔导度、水分利用率、光合有效辐射和蒸腾速率是影响建泽泻叶片净光合速率的主要环境因子,本研究为提高药材质量和产量及指导建泽泻合理栽培提供了科学依据。
OBJECTIVE To study the relationship between photosynthetic characteristics and environmental factors in leaves of Alisma orientalis. METHODS The daily variation of net photosynthetic rate, environmental factors and photo-response in leaves of A. orientalis were measured by LI-6400 Portable Photosynthesis Apparatus. RESULTS The net photosynthetic rate （Pn） and stomatal conductance （Gs） showed a diurnal variation of bimodal curve. The transpiration rate （T,）, intercellular CO2 concentration （Ci） and stomatal limitation （Ls） presented a single peak diurnal variation. The water use efficiency （WUE） was a single valley type of diurnal variation. Correlation analysis indicated that there were positive correlations between P, of A. orientalis and photosynthetic active radiation （PAR）, Gs, Tr or WUE, but negative correlations between Pn and rel- ative air humidity （RH）, Ci or Ls. CONCLUSION A. orientalis is the type of stomatal limitation and sun plant. The net photosynthetic rate of A. orientalis leaves has an obvious ＂midday depression＂ phenomenon. The results suggest that stomatal conductance, water use efficiency, photosynthetic active radiation and transpiration rate are the main environmental factors influencing the A. orientalis photosynthetic rate. This study could offer certain theoretical reference for A. orientalis rational cultivation, as well as provide a scientific basis for improving the quality and production of medicinal materials.
出处
《南京中医药大学学报》
CAS
CSCD
北大核心
2014年第1期68-71,共4页
Journal of Nanjing University of Traditional Chinese Medicine
基金
国家自然科学基金(81173483)
江苏省"青蓝工程"(2012)
江苏省中药学优势学科开放课题(2011ZYX1-006)
中国博士后基金(2012M521097)
江苏省博士后科研资助计划(1102097C)
关键词
建泽泻
光合特性
环境因子
Alisma orientalis
photosynthetic characteristics
environmental factors
