不同光强对6个欧美杨无性系苗期生长及光合特性的影响  

Effects of Light Intensity on the Growth and Photosynthetic Characteristics of Six Populus ×euramericana Clones at Seedling Stage

作　　者：王明援 刘宁[1] 李波 刘成功 丁昌俊[1] 黄秦军[1] WANG Ming-yuan;LIU Ning;LI Bo;LIU Cheng-gong;DING Chang-jun;HUANG Qin-jun(State Key Laboratory of Forest Genetics and Tree Breeding,Key Laboratory of Tree Breeding and Cultivation,National Forestry and Grassland Administration,Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China)

机构地区：[1]林木遗传育种国家重点实验室,国家林业和草原局林木培育重点实验室,中国林业科学研究院林业研究所,北京100091

出　　处：《林业科学研究》2020年第1期123-130,共8页Forest Research

基　　金：“十二五”农村领域国家科技计划课题“阔叶树速生丰产林定向培育技术研究”(2015BAD09B02)。

摘　　要：[目的]研究6个欧美杨无性系生长及光合特性对不同光强的响应差异,为欧美杨苗期快速选育高光效优良品种提供一定的理论依据。[方法]在大田用遮阴网设置CK(100%自然光强)、L1(55%自然光强)和L2(20%自然光强),测定欧美杨的苗高增长量、叶片形态、光合速率、叶绿素荧光特性、叶绿素含量及矿质元素含量。[结果]除11-26-9外,无性系的苗高总生长量随着光强的降低呈下降趋势;随着光强的降低,不同无性系的叶片形态变化趋势不一致,3个光强下无性系间的单叶面积、叶形指数和比叶面积存在差异;无性系在L2处理下的净光合速率(Pn)最低,胞间CO2浓度(Ci)最高;3个处理下,11-26-8的气孔导度均最大;在L1与L2下,11-26-9的F1/F0值均最大;无性系的叶绿素b含量与叶绿素总含量呈现相同的变化趋势;11-26-4、11-26-8和11-36-26的钾、钙、镁元素含量随着光强的降低而增加。[结论]不同无性系对光强变化的适应策略不同,部分无性系的高生长和净光合速率随着光强的降低而减小,降低光强没有破坏无性系的PSⅡ结构。多数无性系的总叶绿素含量、矿质元素含量随着光强的降低而升高。11-36-26无性系的生长势及抗弱光能力较弱。[Objective]In order to provide a theoretical basis for rapid breeding of high light efficiency varieties of Populus ×euramericana clones at seedling stage,the response of growth and photosynthetic characteristics of six P.× euramericana clones to light intensity were studied.[Method]The CK(100%natural light intensity),L1(55% natural light intensity)and L2(20% natural light intensity)were set in the field.The height growth,leaf morphology,photosynthetic rate,chlorophyll fluorescence characteristics,chlorophyll content and mineral element content of P.× euramericana seedlings were determined.[Result]Except for P.deltoides CL.‘Danhong’× N146-9 P.nigra,the total height growth of all clones decreased with the decrease of light intensity;With the weakening of light intensity,the leaf morphological changes of clones were inconsistent,and there were differences in single leaf area,leaf type index and specific leaf area among the clones under the three light intensities.The net photosynthetic rate of the clones was the lowest under the treatment L2,while the intercellular CO2 concentration was the highest.The stomatai conductance of 11-26-8 was the highest under the three treatments.Under LI and L2,the FJFq values of P.deltoides CL.‘Danhong’ × N146-9 P.nigra were the highest.The chlorophyll b content in clones showed the same change trend with the total chlorophyll content.The contents of potassium,calcium and magnesium in P,deltoides CL.‘Danhong’ ×N146-4 P.nigra,P.deltoides CL.‘Danhong’ ×N 146-8 P.nigra and Zhongshi 8 × N31-26 P.nigra increased with the decrease of light intensity.[Conclusion]The adaptation strategies of different clones to the change of light intensity are different.The height growth and net photosynthetic rate of some clones decrease with the decrease of light intensity,and the decrease of light intensity will not destroy the PS U structure of clones.The total chlorophyll content and mineral element content of most clones increase with the decrease of light intensity.Both the gr

关 键 词：欧美杨 光强 光合生理 元素含量 

分 类 号：S718.43[农业科学—林学]