干旱胁迫对药用植物马比木叶片光合特性的影响  

The Effect of Drought Stress on the Photosynthetic Characteristics of Leaves of Nothapodytes pittosporoides

作　　者：高渐飞[1] 周玮[2] 孙燕[1] 李浪 GAO Jianfei;ZHOU Wei;SUN Yan;LI Lang(Guizhou Mountainous Resources Institute,Guizhou Academy of Sciences,Guiyang 550001,China;Department of Business Administration,Guizhou Industry Polytechnic College,Guiyang 550008,China)

机构地区：[1]贵州科学院贵州省山地资源研究所,贵州贵阳550001 [2]贵州工业职业技术学院工商管理系,贵州贵阳550008

出　　处：《信阳师范学院学报（自然科学版）》2022年第4期549-556,共8页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家科技支撑计划项目(2016YFC0502601);贵州省科技攻关项目(黔科合平台人才[2017]5411号)。

摘　　要：采用LI-6400便携式光合仪器测定并分析了不同干旱和光照强度胁迫下,药用植物马比木(Nothapodytes pittosporoides(Oliv.)Sleum.)叶片的光合响应。结果表明:马比木的光合特性对光合有效辐射(PAR)和土壤水分变化响应明显,弱光条件下(PAR<200μmol/(m^(2)·s)),光补偿点(LCP)随土壤水分含量减小呈现先减小后增大趋势,表观量子效率(AQE)则呈逐渐减小趋势;强光条件下(PAR>600μmol/(m^(2)·s)),光饱和点(LSP)先增加后减小,在水分含量10.5%~22.0%范围达到最大值,净光合速率(P_(n))和水分利用率(WUE)处于稳定阶段且保持在最大值附近。马比木对弱光的利用能力更强,对强光也有较好的适应性;土壤水分含量10.5%是其耐旱极值,22.0%~25.8%较适合生长。The photosynthetic responses of leaves of Nothapodytes pittosporoides(Oliv.)Sleum.,a medicinal plant,are tested and analyzed under different drought and light intensity stresses using an LI-6400 portable photosynthetic instrument.The results show that the photosynthetic characteristics of N.pittosporoides are significantly responsive to the changes of photosynthetically active radiation(PAR)and soil moisture content.Under low light conditions(PAR<200μmol/(m^(2)·s)),the light compensation point(LCP)first decreases and then increases with the decrease of soil moisture content,while the apparent quantum yield(AQE)gradually decreases.Under strong light conditions(PAR>600μmol/(m^(2)·s)),the light saturation point(LSP)first decreases and then increases with a peak at a moisture content of 10.5%~22.0%.The net photosynthesis rate(P_(n))and water use efficiency(WUE)are in a stable stage and keep around the maximum value.The N.pittosporoides shows better utilization of low light,and is also with good adaptability to strong light.The soil moisture content of 10.5%might be its extreme drought tolerance,and that of 22.0%~25.8%is more suitable for N.pittosporoides growth.

关 键 词：马比木 光合特性 光照强度 土壤水分 光响应曲线 

分 类 号：S567.19[农业科学—中草药栽培]