Page 164 - 《广西植物》2024年第5期
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9 5 2                                  广  西  植  物                                         44 卷
           ( 1. Sugarcane Research Instituteꎬ Guangxi Academy of Agricultural Sciencesꎬ Nanning 530007ꎬ Chinaꎻ 2. Key Laboratory of Sugarcane Biotechnology
                    and Genetic Improvementꎬ Ministry of Agriculture and Rural Affairsꎬ Nanning 530007ꎬ Chinaꎻ 3. Key Laboratory of Guangxi
                      Sugarcane Genetic Improvementꎬ Nanning 530007ꎬ Chinaꎻ 4. Guangxi Forestry Group Guiqinlin Pulp Paper Co. Ltd.ꎬ
                          Nanning 530012ꎬ Chinaꎻ 5. Agriculture College of Guangxi Universityꎬ Nanning 530004ꎬ Chinaꎻ 6. South
                                 China Botanical Gardenꎬ Chinese Academy of Sciencesꎬ Guangzhou 510650ꎬ China )

                 Abstract: In order to investigate the function and regulation mechanism of NDH dehydrogenase gene in Santalum
                 albumꎬ the technique of RACE was used to amplify the full ̄length sequence of SaNDH6 with heartwood as material. The
                 technique of quantitative real ̄time fluorescence PCR (RT ̄qPCR) was employed to analyze its expression in different
                 tissues and after hormone induction. The subcellular location was determined by Arabidopsis thaliana protoplast transient
                 expression. 2 kb cis ̄acting element upstream of start codon ATG was analyzed by PlantCARE online serviceꎬ and the
                 transcription factors which could bind the cis ̄acting elements was predicted by PlantRegMap software. The results were
                 as follows: ( 1) SaNDH6 encoded 303 amino acids. It was a hydrophobin and located in chloroplast. ( 2) The
                 phylogenetic tree analysis indicated that SaNDH6 had a more closely evolutionary relationship with NDH6 from woody
                 plants. (3) Plant care analysis showed that the promoter sequence of SaNDH6 contained a large number of light
                 responsive cis ̄acting elements such as ACEꎬ AE ̄boxꎬ Box 4ꎬ G ̄Box and GT1 ̄motif. It also contained abscisic acid
                 (ABA) responsive element ABREꎬ jasmonic acid methyl ester (MeJA) responsive elements CGTCA ̄motif and TGACG ̄
                 motifꎬ gibberellin (GA ) responsive elements P ̄boxꎬ ARE cis ̄acting regulatory element essential for the anaerobic
                                  3
                 inductionꎬ and TC ̄rich repeats element involved in defense and stress responsiveness. (4) The results of plantRegMap
                 analysis showed that there were 76 transcription factors that could bind to the SaNDH6 promoterꎬ and among whichꎬ ERF
                 transcription factor was the most (up to 40 TFs). (5) SaNDH6 can be expressed in the tissues of rootsꎬ heartwoodsꎬ
                                                                                     ̄4       ̄1
                 calluses and leavesꎬ but had a higher expression level in the tissue of leavesꎻ under 1×10 molL MeJA and GA
                                                                                                        3
                 treatmentsꎬ the expression level of SaNDH6 were significantly elevated after 3 h when compared with 0 hꎬ
                 respectively. In conclusionꎬ SaNDH6 was a nucleus gene encoding proteinꎬ its expression was induced by light and some
                 hormonesꎬ and it might be involved in against some defense and stress processes in S. album.
                 Key words: Santalum albumꎬ chloroplastꎬ NDH dehydrogenaseꎬ subcellular locationꎬ expression regulation



                光合作用中ꎬ从 H O 到 NADP 的线性电子传                      进一步研究表明ꎬ除以上 11 个基因外ꎬ许多叶绿
                                            +
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            递可以同时产生 ATP 和 NADPHꎬ但产生的 ATP /                     体 NDH 复合体基因是由其核基因组编码的( Sirpio
            NADPH 不足 1.5ꎬ不能满足卡尔文循的需要ꎬ这些                        et al.ꎬ 2009ꎻ Yamori et al.ꎬ 2011ꎻ Shikanaiꎬ
            不足的 ATP 由围绕 PSI 的循环电子传递途径进行                        2016)ꎮ 目前ꎬ在拟南芥中共鉴定了 30 多个 NDH
            补偿(Yamori & Shikanaiꎬ 2016)ꎮ 被子植物中ꎬ依               复合体基因ꎬ总体可以分为 5 类(Armbruster et al.ꎬ
            赖于 NDH 复合体的电子传递是围绕 PSI 循环电子                        2013ꎻ Fan et al.ꎬ 2015ꎻ Peltier et al.ꎬ 2016 )ꎮ
            传递的途径之一ꎬ其在植物的光合、呼吸、生长以                             SubA 由 7 个基因组成ꎬ其中 4 个由叶绿体基因组
            及在保护植物免受强光伤害和抵御低温等逆境胁                              编码 ( NdhH ̄NdhK)ꎬ 另 外 3 个 由 核 基 因 组 编 码

            迫中均发挥作用(Endo et al.ꎬ 1999ꎻ Yamori et al.ꎬ          (NdhM ̄NdhO)ꎬ均与电子传递到辅酶 Q 有关( He
            2011ꎻ Yamori & Shikanaiꎬ 2016)ꎮ 因 此ꎬNDH 复          et al.ꎬ 2015)ꎻSubM 的 6 个成员( NdhA ̄NdhG) 均
            合体的研究越来越受关注ꎮ Shinozaki 等(1986) 和                   由叶绿体基因组编码ꎬ它们在膜中构成了复合体

            Ohyama(1996) 分别通过烟草( Nicotiana tabacum)            臂并参与电子在膜中的传递ꎻSubB( PnsB1 ̄PnsB5)
            和地钱(Marchantia polymorpha)的叶绿体基因组测                 和 SubL( PnsL1 ̄PnsL5) 的成员均由核基因组编码
            序发现了 11 个叶绿体编码的 NDH 基因ꎬ虽然这些                        且都是叶绿体 NDH 复合体所特有的组分ꎬSubB 可
            基因与线粒体 NDH 基因同源ꎬ但叶绿体 NDH 主要                        能与维持 NDH 复合体 的 稳 定 有 关 ( Peng et al.ꎬ
            从铁氧 化 还 原 蛋 白 ( Fd) 接 受 电 子 ( Ifuku et al.ꎬ        2009ꎻ Takabayashi et al.ꎬ 2009)ꎬ SubL 可 以 维 持
            2011ꎻ Yamamoto et al.ꎬ 2011ꎻ Shikanaiꎬ 2016 )ꎮ     NDH ̄PSI 复合体的稳定性( Peltier et al.ꎬ 2016)ꎻ
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