薇甘菊光能利用及叶绿素合成在不同光照强度下的响应  

Light Energy Utilization and Response of Chlorophyll Synthesis Under Different Light Intensities in Mikania micrantha

作　　者：金梦娇 刘博 王抗抗 张广忠 钱万强 万方浩 JIN MengJiao;LIU Bo;WANG KangKang;ZHANG GuangZhong;QIAN WanQiang;WAN FangHao(College of Plant Medicine,Qingdao Agricultural University,Qingdao 266109,Shandong;Agricultural Genomics Institute at Shenzhen,Chinese Academy of Agricultural Sciences/Shenzhen Branch,Guangdong Laboratory of Lingnan Modern Agriculture/Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs,Shenzhen 518120,Guangdong)

机构地区：[1]青岛农业大学植物医学学院,山东青岛266109 [2]中国农业科学院深圳农业基因组研究所/岭南现代农业科学与技术广东省实验室深圳分中心/农业农村部农业基因数据分析重点实验室,广东深圳518120

出　　处：《中国农业科学》2022年第12期2347-2359,共13页Scientia Agricultura Sinica

基　　金：国家自然科学基金面上项目(32072490)。

摘　　要：【目的】光是植物进行光合作用的重要生态因素之一,光合色素对光的捕获和利用影响植物的生长发育进程,进而影响其在自然生态系统中的生存和适合度。明确薇甘菊(Mikania micrantha)光合生理特征与叶绿素生物合成途径的基因表达对不同光照强度的响应,以及薇甘菊光合能量与叶绿素转化的相互关系,为解析薇甘菊“快速生长”提供生理生态学证据。【方法】以薇甘菊为研究对象,采用乙醇浸提法测定不同光照强度(0、20%、40%、100%)下各光合色素含量,分析其叶绿素a和b比值(Chl a/b)的变化规律,比较不同光合途径代表植物(C3、C4和CAM)光合特性;利用微量法和蒽酮比色法分别测定上述光照强度下薇甘菊叶片组织中ATP和淀粉含量;构建不同光照强度下薇甘菊cDNA文库并开展转录组测序;利用OrthoFinder、Blastp、HISAT2、StringTie和R包等生物信息学软件分析不同光照强度变化下薇甘菊叶绿素合成和捕光复合体(LHC)基因表达模式,阐述叶绿素合成途径相关基因表达变化规律。【结果】在100%的光照强度下,薇甘菊叶绿素b和类胡萝卜素含量以及Chl a/b与C4植物玉米相近,并且薇甘菊和玉米叶片中Chl a/b显著高于C3(水稻和番茄)和CAM(芦荟)植物。不同光照强度下的薇甘菊叶片中叶绿素a、叶绿素b和类胡萝卜素含量变化不显著,但Chl a/b呈现出随光照强度增加而显著增加的趋势;40%和100%光照强度下,薇甘菊叶片中ATP含量变化幅度较小,而淀粉含量随光照强度上升显著升高;当光照强度为0时淀粉含量急剧下降,此时ATP含量呈现升高趋势;薇甘菊叶绿素生物合成中HEMA、CHLH、CRD1和CAO基因家族的基因表达量受光诱导调控,高光照强度下捕光复合体(LHC)基因的表达量较高。【结论】不同光照强度下薇甘菊叶片可能通过调节叶绿素a和b的合成,调控淀粉和ATP的相互转化,奠定了薇甘菊较高光合速率和较�【Objective】Light is one of the important ecological factors for photosynthesis of plants.The capture and utilization of light by photosynthetic pigments affects the growth and development of plants,and then affects their survival and fitness in natural ecosystems.The objective of this study is to clarify the photosynthetic physiological characteristics and response of gene expression of chlorophyll biosynthesis pathway to different light intensities in Mikania micrantha,as well as the relationship between photosynthetic energy and chlorophyll transformation,and to provide physiological and ecological evidences for explaining the“rapid growth”of M.micrantha.【Method】The photosynthetic pigment content of M.micrantha was determined by ethanol extraction under different light intensities(0,20%,40%and 100%).The variation pattern of chlorophyll a and b ratio(Chl a/b)was analyzed.The photosynthetic characteristics of M.micrantha were compared with the representative plants of different photosynthetic pathways(C3,C4 and CAM).The contents of ATP and starch in M.micrantha leaves under the above light intensities were determined by micro-method and anthrone colorimetric method.The cDNA library of M.micrantha under different light intensities was established and sequenced.Bioinformatics software including OrthoFinder,Blastp,HISAT2,StringTie,R package were used to analyze the expression pattern of genes involved in chlorophyll synthesis and light-harvesting complex(LHC)in M.micrantha under different light intensities.The expression patterns of genes related to chlorophyll synthesis pathway were identified.【Result】At 100%light intensity,the Chl b and carotenoid contents and Chl a/b in M.micrantha leaves were similar to those in C4 plant(maize).The Chl a/b in M.micrantha and maize leaves was significantly higher than that in C3(rice and tomato)and CAM(aloe)plants.The contents of Chl a,Chl b and carotenoid in M.micrantha leaves under different light intensities did not change significantly,but Chl a/b significantl

关 键 词：薇甘菊 光合色素特征 ATP含量 淀粉储存 不同光环境的响应 基因表达调控 

分 类 号：S451[农业科学—植物保护]