4个奇楠沉香品系苗期不同光处理阶段生理特性和叶片结构比较  

Comparison on Physiological Characteristics and Leaf Structures of Four Aquilaria sinensis'Chi-Nan'Strains at Different Light Treatment Stages during Seedling Stage

作　　者：潘彩玲 邓福春 官秀芳 梁家铭 郝静伟 刘莉 竺永金 李开祥[2] 叶绍明[1] Pan Cailing;Deng Fuchun;Guan Xiufang;Liang Jiaming;Hao Jingwei;Liu Li;Zhu Yongjin;Li Kaixiang;Ye Shaoming(College of Forestry,Guangxi University,Guangxi Colleges and Universities Key Laboratory for Cultivation and Utilization of Subtropical Forest Plantation,Guangxi Key Laboratory of Forest Ecology and Conservation,Nanning,Guangxi 530004,China;Guangxi Forestry Research Institute,Guangxi Key Laboratory of Special Non-wood Forests Cultivation and Utilization,Nanning,Guangxi 530002,China;Nanning Arboretum,Nanning,Guangxi 530031,China)

机构地区：[1]广西大学林学院,广西高校亚热带人工林培育与利用重点实验室,广西森林生态与保育重点实验室,广西南宁530004 [2]广西壮族自治区林业科学研究院,广西特色经济林培育与利用重点实验室,广西南宁530002 [3]南宁树木园,广西南宁530031

出　　处：《广西林业科学》2024年第6期728-737,共10页Guangxi Forestry Science

基　　金：广西重点研发计划项目(桂科AB22080082);广西林业科技项目(桂林科研[2022ZC]第72号);广西重点实验室项目(JA-23-02-02)。

摘　　要：为探讨不同奇楠沉香(Aquilaria sinensis'Chi-Nan')品系在苗期前期遮荫与后期自然光照条件下的生长适应性变化,为奇楠沉香优质苗木培育及推广应用提供科学依据和指导,以4个易结早结香奇楠沉香品系TJ(GLX01)、JSY(GLX02)、GX(GLX03)和XGY(GLX11)为试验材料,观察其在嫁接后第90~240天的生长状况,比较经过150天遮荫处理和90天恢复自然光照培育后其叶片生理特性和解剖结构等的差异。结果表明,嫁接后第90~150天,4个奇楠沉香品系幼苗均生长缓慢;嫁接后第150~240天,4个奇楠沉香品系株高、地径和穗径均增加,叶片厚度、上表皮厚度、下表皮厚度、海绵组织厚度和中脉厚度及净光合速率和水分利用效率均升高,胞间二氧化碳浓度和叶绿素相对值均降低。GLX01和GLX03均具有较厚的上表皮,有利于提升光合效率;在自然光照下,GLX01和GLX03净光合速率和气孔导度均显著提升,更能适应光照;GLX03叶绿素合成调控机制更有效。GLX02和GLX11对光照变化敏感,育苗时需精细调控光照,以保证其正常生长。To explore growth adaptability changes of different Aquilaria sinensis'Chi-Nan'strains under earlystage shading and late-stage natural light condition at seedling stage and to provide scientific basis and guidance for cultivation and popularization of high-quality seedlings of A.sinensis'Chi-Nan',four A.sinensis'Chi-Nan'strains,including TJ(GLX01),JSY(GLX02),GX(GLX03)and XGY(GLX11),were used as experimental materials to observe growth status from 90 to 240 days after grafting.Differences in leaf physiological characteristics and anatomical structures were compared after 150 days of shading treatment and 90 days of natural light recovery.Results showed that seedlings of four strains of A.sinensis'Chi-Nan'grew slowly from 90 to 150 days after grafting.From 150 to 240 days after grafting,plant height,ground diameter,graft union diameter,leaf thickness,upper epidermal thickness,lower epidermal thickness,spongy tissue thickness and main vein thickness as well as net photosynthetic rate and water use efficiency of four A.sinensis'Chi-Nan'strains increased,and intercellular carbon dixode concentration and SPAD decreased.GLX01 and GLX03 had thicker upper epidermis,which was conducive to improve photosynthetic efficiency.Net photosynthetic rates and stomatal conductances of GLX01 and GLX03 increased significantly under natural light environment.Chlorophyll synthesis regulation mechanism of GLX03 was more effective.GLX02 and GLX11 were sensitive to light changes,and light conditions need to be finely regulated during seedling raising.

关 键 词：叶片解剖结构 光合生理特性 光照 奇楠沉香 

分 类 号：X123[环境科学与工程—环境科学]