为探究发光二极管（LED）黄光不同光强对滇重楼光生物学特性和品质的影响，同时为 LED 光源在滇重楼生产上的应用提供理论依据。本研究以 3 年生滇重楼种苗为试验材料，采用波长为 590 nm±5 nm 的黄光为照射光源，设置了 25、50、75、100 μmol/(m2·s)4 个光强梯度处理，对滇重楼生物学鲜重、叶片光合荧光特性及根茎皂苷含量进行了研究。结果表明，75 μmol/(m2·s)处理滇重楼叶片净光合速率、荧光指标、气孔导度、蒸腾速率均为最高。25 μmol/(m2·s)处理的荧光指标最低。100 μmol/(m2·s)处理下重楼根茎皂苷含量最高，25 μmol/(m2·s)处理下皂苷含量最低。综合分析滇重楼叶片光合荧光特性和根茎皂苷含量，黄光 75 μmol/(m2·s)对促进滇重楼叶片的光合作用最有利，黄光 100 μmol/(m2·s)对增加滇重楼根茎皂苷含量最有利。建议在滇重楼栽培上将黄光光强控制在75~100 μmol/(m2·s)为宜。

In order to investigate the effects of different intensity of LED yellow light on the biological characteristics and quality of Paris polyphylla var.yunnanensis, and to provide theoretical basis for the application of LED light source in the production of Paris polyphylla var.yunnanensis, 3-year-old seedlings of Paris polyphylla var. yunnanensis were used as experimental materials and 4 light intensity gradients of 25, 50, 75, 100 μmol/(m2·s) were set for irradiating the yellow light with a wavelength of 590 nm±5 nm. The fresh weight, photosynthetic fluorescence characteristics of leaves and saponins content of rhizome were studied. The results showed that the net photosynthetic rate, fluorescence index, stomata conductance and transpiration rate were the highest in leaves with 75 μmol/(m2·s) treatment and the fluorescence index was the lowest with 25 μmol/(m2·s) treatment. The saponins content of rhizome was the highest with 100 μmol/(m2·s) treatment and lowest with 25 μmol/(m2·s) treatment. Comprehensive analysis of photosynthetic characteristics of leaves and saponins content of rhizome showed that, 75 μmol/(m2·s) intensity of LED yellow light was favorable to promote the photosynthesis and 100 μmol/(m2·s) intensity could increase the saponins content in rhizome of Paris polyphylla var.yunnanensis. Consequently, the yellow light intensity should be controlled appropriately at 75-100 μmol/(m2·s) on the cultivation of Paris polyphylla var. yunnannensis.

国家自然科学基金项目（81260613、30873374）