广西植物2024，Vol.44Issue(3)：501-509,9.DOI:10.11931/guihaia.gxzw202112012
闽楠幼苗适应弱光环境的可塑性研究
Plasticity of Phoebe bournei seedlings adapting to low light environment
摘要
Abstract
The purpose of this study is to explore the survival strategy of Phoebe bournei seedlings in natural communities under extremely low light environment.Two-year-old seedlings of P.bournei were used as experimental materials.Leaf morphology,anatomical structure and photosynthetic physiological characteristics of P.bournei seedlings were measured by simulating different light environments(100％,35％and 10％light transmittance),and to explore the internal relationship between seedling morphology,physiological plasticity and light adaptation.The results were as follows:(1)The leaf length,leaf width,leaf area and specific leaf area(SLA)of seedlings increased with the decrease of light intensity.The leaf thickness,palisade tissue thickness,spongy tissue thickness and palisade/spongy(palisade tissue thickness/spongy tissue thickness)of 10％light transmittance were the minimum.(2)The net photosynthetic rate(Pn),stomatal conductance(G,),transpiration rate(Tr),light utilization efficiency(LUE),photochemical quenching coefficient(qp),non photochemical quenching coefficient(NPQ),effective photosynthetic quantum yield(Fv'/Fm')and potential photochemical efficiency(Fv/Fo)of photosystem Ⅱ of 35％light transmittance were significantly higher than those of 100％and 10％light transmittances.(3)Chlorophyll a,chlorophyll b,carotenoids,total chlorophyll and maximal photochemical efficiency(Fv/Fm)all increased with the decrease of light intensity,but chlorophyll a/b decreased with the decrease of light intensity.(4)The phenotypic plasticity indexes of seedling structure and physiology showed that photosynthetic pigment content characteristics＞morphological characteristics＞photosynthetic characteristics＞anatomical structure characteristics＞chlorophyll fluorescence parameter characteristics,among which,the phenotypic plasticity indexes of leaf area,SLA,Pn,Gs,LUE and photosynthetic pigment content ranged from 0.455 to 0.755.To sum up,P.bournei seedlings are not suitable to grow under full light,and perform well under about 35％light transmittance;under extremely low light with 10％light transmittance,P.bournei leaves can improve light energy capture by increasing leaf area,SLA,Pn and photosynthetic pigment content;the seedlings of P.bournei mainly adapt to the low light environment by adjusting the plasticity of photosynthetic pigment content and morphology,coordinating with the changes of anatomical structure,photosynthetic physiology and chlorophyll fluorescence parameter plasticity.This study can provide theoretical reference for the management and selection of light environment of P.bournei for future cultivation.关键词
弱光/闽楠幼苗/叶片形态/光合生理/可塑性Key words
low light/Phoebe bournei seedling/leaf morphology/photosynthetic physiology/plasticity分类
农业科技引用本文复制引用
安静,韦小丽,姚瑶,金念情,吴高殷,王晓..闽楠幼苗适应弱光环境的可塑性研究[J].广西植物,2024,44(3):501-509,9.基金项目
国家自然科学基金(31870613) （31870613）
贵州高层次创新人才计划—"百"层次人才项目(黔科合平台人才[2016]5661). （黔科合平台人才[2016]5661）
