遮光对桔梗幼苗生长及生理指标的影响  

Effects of Shading on the Growth and Physiological Indexes of Platycodon grandiflorus Seedlings

作　　者：汪丽莎 徐德平 徐艳 李冬林 WANG Lisha;XU Deping;XU Yan;LI Donglin(Biyang County Forestry Technology Promotion Station,Biyang 463799,China;Jinling Institute of Technology,Nanjing 210038,China;Yangzhou Urban Forest EcosystemNational Research Station,Yangzhou 225000,China)

机构地区：[1]泌阳县林业技术推广站,河南泌阳463799 [2]金陵科技学院,江苏南京210038 [3]江苏扬州城市森林生态系统国家定位观测研究站,江苏扬州225000

出　　处：《特产研究》2024年第1期81-85,共5页Special Wild Economic Animal and Plant Research

基　　金：江苏省产学研合作计划项目(BY2021102);江苏省农业自主创新资金项目[CX(20)3152]。

摘　　要：为探明不同光环境下桔梗幼苗形态及生理特性的影响,揭示桔梗的耐荫性。本研究设置T_(1)(相当于50%透光率)、T_(2)(相当于25%透光率)、T_(3)(相当于5%透光率)、T_(0)(不遮光)4种不同的光处理,研究了遮光对桔梗幼苗形态和部分生理指标的变化。结果表明,T_(2)处理下幼苗的株高最大,并显著高于对照(P<0.05),但与T_(1)无显著显差异(P>0.05);T_(3)处理下的地径、叶面积和生物量均显著变小;T_(1)、T_(2)处理下,桔梗叶片可溶性蛋白质含量增加,与对照相比存在显著差异(P<0.05),可溶性糖含量也呈现类似的变化,而T_(3)处理则会引起可溶性蛋白质及糖的显著下降;T_(1)、T_(2)处理下,桔梗叶片内MDA下降,并显著低于对照(P<0.05),但T3处理则引起MDA显著上升;4种光处理下桔梗幼苗的综合隶属函数值分别是3.125、8.361、5.960、0,以T_(1)处理下的综合隶属函数值最大。适度遮光不会对桔梗幼苗的正常发育带来不利影响,50%的遮光可以为桔梗幼苗的生长提供优越的生长条件。To explore effects of shading on the growth and physiological indicators of Platycodon grandiflorus seedlings and reveal the shade tolerance,four shading treatments including full sunlight(T_(0)),50% sunlight(T_(1)),25% sunlight(T_(2)) were set,the changs of morphological parameter and physiological indexes of P.grandiflorus seedlings were researched.The results showed that under T_(2),height of seedlings was biggest,and significantly higher than the control(P <0.05),but not than T1(P> 0.05).Both ground diameter,leaves area and biomass were significantly reduced under T_(3).Soluble protein content in leaves increased under T_(1) and T_(2),and was significantly higher than the control(P <0.05),the soluble sugar also showed similar changes,but T_(3) caused a significant decrease in soluble protein and soluble sugar.Under T_(1) and T_(2),MDA decreased in the leaves and significantly lower than the control(P <0.05),but T_(3) caused a significant increase in MDA.Through comprehensive analysis of Fuzzy,the comprehensive subordinate function value of seedlings under four treatments were3.125,8.361,5.960 and 0,respectively,and that under T_(1) was the biggest.Moderate shading does not adversely affect the normal development of P.Grandiflorus,and 50% mild shading can provide superior growth conditions for the growth of P.grandiflorus seedlings.

关 键 词：遮光 桔梗 生长 生理指标 

分 类 号：S567.239[农业科学—中草药栽培]