遮荫对望天树生长和生理生化特性的影响  

Effects of Shading on Chlorophyll Fluorescence and Physiological and Biochemical Characteristics of Parashorea cathayensis Wang Hsie

作　　者：黄菁[1] 魏丽萍[1,2] 周会平 原慧芳[1] 田耀华[1] 王琼[2] HUANG-jing;WEI Li-ping;ZHOU Hui-ping;YUAN hui-fang;TIAN Yao-hua;WANG-qiong(Yunnan Institute of Tropical Crops,Jinghong Yunnan 666100,China;College of Agronomy and Biotechnology,Yunnan Agriculture University,Kunming 650201,China)

机构地区：[1]云南省热带作物科学研究所,云南景洪666100 [2]云南农业大学农学与生物技术学院,昆明650201

出　　处：《西南师范大学学报（自然科学版）》2021年第2期74-79,共6页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：国家重点研发计划项目(2020YSD1000600).

摘　　要：为研究不同遮荫处理后对望天树生理特性及荧光的影响,设置4种遮荫(光照强度)组,即:透光率100%(CK),透光率75%(T1),透光率50%(T2),透光率25%(T3).结果表明:75%遮荫处理的望天树幼苗相对生长速率、可溶性糖和蔗糖质量分数均显著高于全光照及其他光照处理;50%遮荫处理的望天树幼苗总叶绿素高于全光照及其他光照处理;比叶质量、可溶性蛋白和丙二醛质量分数则呈相反趋势,即随遮荫度的提高而下降;叶绿素荧光参数最大荧光(Fm)、可变荧光(Fv)和PSII最大光化学效率(Fv/Fm)随着遮荫程度的增加而增加,半饱和光强(IK)和电子传递速率(ETR)随着遮荫程度的增加而降低.根据望天树幼苗各项生理指标和荧光参数的变化趋势认为,50%~75%的遮荫处理更适于望天树幼苗的生长,遮荫处理对望天树幼苗的生长有促进作用,光照过强或过弱均会抑制望天树幼苗的生长.Through studying the effects of different shading treatments on the physiological characteristics and fluorescence of the tree,four kinds of shading(light intensity)were set:100%light transmittance(CK),75%light transmittance(T1),50%light transmittance(T2),and 25%light transmittance(T3).The results show that the relative growth rate,soluble sugar and sucrose content of the seedlings treated with 75%shade were significantly higher than those treated with full light and other light.The total chlorophyll content of 50%shade treatment was higher than that of full light treatment and other light treatment.The content of specific leaf mass,soluble protein and malondialdehyde showed the opposite trend,that is,with the increase of shade High and falling;Maximum fluorescence of chlorophyll fluorescence parameters(Fm),variable fluorescence(Fv)and maximum photochemical efficiency of PSII(Fv/Fm)increased with the increase of shading degree,while half-satiety and light intensity(IK)and electron transfer rate(ETR)decreased with the increase of shading degree.According to the variation trend of physiological indexes and fluorescence parameters of the seedlings,it is believed that the shade treatment of 50%-75%is more suitable for the growth of the seedlings and the shade treatment of the seedlings is more suitable for the growth of the seedlings Seedling growth can be promoted.Too much or too little light can inhibit the seedling growth.

关 键 词：望天树 遮荫 荧光 生理生化 

分 类 号：S311[农业科学—作物栽培与耕作技术]