Page 18 - 《广西植物》2022年第12期
P. 18

2 0 0 8                                广  西  植  物                                         42 卷
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                  LI Zhenbing ꎬ REN ting ꎬ DENG Jiaojiao ꎬ CHEN Junpei ꎬ ZHOU Songdong ꎬ
                                                      2           2              2
                                       ZENG Xinmei ꎬ MA Jiao ꎬ LI Fangwen

                  ( 1. College of Life Sciencesꎬ Sichuan Universityꎬ Key Laboratory of Bio ̄Resource and Eco ̄Environment of Ministry of Educationꎬ
                            Chengdu 610065ꎬ Chinaꎻ 2. Chengdu Institute of Landscape Architectureꎬ Chengdu 610083ꎬ China )

                 Abstract: Hibiscus mutabilis is native to China with a long cultivation historyꎬ and is an ancient garden tree species and
                 medicinal plant. In this studyꎬ we selected three cultivars of H. mutabilis in a hybrid combination ( H. mutabilis

                 cv. Danbanbaiꎬ H. mutabilis cv. Jinqiusongꎬ H. mutabilis cv. Mudanfen) to investigate evolutionary characteristics
                 between the cultivars of H. mutabilis and its related speciesꎬ and clarify the phylogenetic relationship between the
                 cultivars of H. mutabilis and its related speciesꎬ as well as explore the genetic model of chloroplast genome (cpDNA) of
                 H. mutaibilis at the same time. We first sequenced the three cultivars of H. mutaibilis using Illumina NovaSeq. After
                 assembly and annotationꎬ three complete chloroplast genome sequences were obtained. The cpDNAs of the related
                 species H. taiwanensis from our groupꎬ and H. syricus and H. rosa ̄sinensis from the gene bank. Then we carried out
                 comparative analysis on composition and structure of cpDNAs of four species of Hibiscus and three cultivars of H.
                 mutabilisꎬ and completed its phylogenetic tree reconstruction. The results were as follows: (1) Total sizes of cpDNAs of
                 H. mutabilis cv. Danbanbaiꎬ H. mutabilis cv. Jinqiusongꎬ H. mutabilis cv. Mudanfen were 160 880ꎬ 160 879ꎬ 160 920
                 bpꎬ respectivelyꎬ and the total gene number was 130ꎬ including 85 protein ̄coding genesꎬ eight ribosomal RNAsꎬ and 37
                 transfer RNAs. (2) The comparative analyses showed that the cpDNAs of three cultivars of H. mutabilis and the related
                 species H. taiwanensis were highly conservedꎬ and the inverted repeat regions (IR) were all 26 300 bpꎻ H. rosa ̄sinensis

                 and H. syriacus shrank to at 25 745 and 25 598 bpꎬ respectively. (3) The phylogenetic analysis revealed that the three
                 cultivars were planted into a monophyletic branchꎬ and then together with H. taiwanensis into a high support branchꎬ
                 indicating that H. mutabilis and H. taiwanensis had the closest relationshipꎻ Compared with H. syriacus and H. rosa ̄
                 sinensisꎬ H. mutabilis and H. taiwanensis were more closely related to H. hamaboꎬ H. tiliaceum and H. canabinus. (4)
                 Three cultivars of H. mutabilis could be distinguished by cpDNA sequenceꎬ the length of LSC/ SSC of H. mutabilis

                 cv. Danbanbaiꎬ H. mutabilis cv. Jinqiusongꎬ H. mutabilis cv. Mudanfen were 89 355 bp/ 18 925 bpꎬ 89 353 bp/ 18 926
                 bpꎬ 89 400 bp/ 18 920 bpꎬ respectively. And candidate molecular markers and DNA barcodes had been developed from
                 repeat sequence and nucleotide diversity analysesꎬ which could be used as a tool for cultivars identification. (5) The
                 cpDNAs of H. mutabilis cv. Danbanbai and H. mutabilis cv. Jinqiusong showed a minimum difference and had the closest
                 phylogenetic relationship. According to the relationship between their female and offspringꎬ the maternal genetic
                 characteristics of the cpDNAs of Hibiscus were proved. This study will help us to understand the evolutionary
                 characteristics and phylogenetic relationship of cpDNAs of three cultivars of H. mutabilis and H. taiwanensisꎬ and provide
                 basic data on cpDNA for accurate identification of the cultivars of H. mutabilis and breeding of excellent cultivars.
                 Key words: Hibiscus mutabilisꎬ Hibiscus taiwanensisꎬ chloroplast genome ( cpDNA )ꎬ molecular markerꎬ
                 phylogenetic tree




                木芙蓉 (Hibiscus mutabilis) 别名拒霜花ꎬ属锦              的人工选育和自然杂交导致木芙蓉品种间遗传关
            葵科木槿属ꎬ原产于中国ꎬ在东亚及东南亚地区均                             系错综复杂、亲缘关系不明、分类和进化关系模

            有分布ꎮ 其 花 大 色 艳 且 花 期 较 长 ( 杨 苑 钊 等ꎬ                糊ꎮ 对木芙蓉进行品种分类以及探讨其亲缘关
            2019)ꎮ 木芙蓉具有较强的固碳、释氧、降温的能                          系ꎬ对于木芙蓉品种间杂交以及新品种的选育具

            力ꎬ在城市园林中具有重要的应用价值 ( 郑鹏等ꎬ                           有重 要 意 义 ( 张 璐 等ꎬ 2021 )ꎮ 台 湾 芙 蓉 ( H.
            2012)ꎮ 成都市植物园长期以来致力于市花木芙                           taiwanensis)别名狗头芙蓉或山芙蓉ꎬ亦属于木槿
            蓉的研究及应用ꎬ并培育了许多抗病抗虫品种和                              属ꎬ原 产 于 台 湾 阿 里 山ꎬ 是 当 地 特 有 的 原 生 种
            不同花期的品种 ( 王莹ꎬ2017)ꎮ 但是ꎬ长期以来                        (Limꎬ 2014)ꎮ 据中国植物志记载ꎬ台湾芙蓉非常
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