园 艺 学 报 2014,41(11):2281–2390 http: // www. ahs. ac. cn Acta Horticulturae Sinica E-mail: yuanyixuebao@http://doc.guandang.net 换锦花LsMYB4基因的克隆与表达分析
许振渊,高燕会*,周芬静,李国庆,熊 艳,童再康
(浙江农林大学亚热带森林培育国家重点实验室培育基地,浙江临安 311300)
摘 要:以换锦花(Lycoris sprengeri)为材料,采用RT-PCR方法和RACE技术相结合的方法,从
花瓣中克隆了MYB基因的cDNA全长序列,命名为LsMYB4。该序列全长793 bp,包含606 bp完整开放
阅读框,编码201个氨基酸,具有明显的R2R3-MYB结构域,与中国水仙NtMYB相似性达96%。实时
荧光定量PCR分析结果表明,LsMYB4在换锦花不同组织和不同花期均有表达,其中在花瓣中的相对表
达量比叶中多9 ~ 10倍,在盛花期的相对表达量比花苞期多20倍。不同花色无性系花瓣中表达量存在差
异,花色较浅的无性系高于其它无性系,推测LsMYB4在调控换锦花花色形成的过程中起着负调控作用。
关键词:换锦花;MYB基因;克隆;表达分析
中图分类号:S 68 文献标志码:A 文章编号:0513-353X(2014)11-2281-10
Cloning and Expression Analysis of LsMYB4 Gene in Lycoris sprengeri XU Zhen-yuan,GAO Yan-hui*,ZHOU Fen-jing,LI Guo-qing,XIONG Yan,and TONG Zai-kang (The Nurturing Station for the State Key Laboratory of Subtropical Silviculture,Zhejiang Agriculture and Forestry University,Lin’an,Zhejiang 311300,China)
Abstract:A MYB gene named LsMYB4 was cloned by RT-PCR and RACE methods from petals of Lycoris sprengeri. Sequences analysis showed that the full-length MYB cDNA was 793 bp and contained a ORF of 606 bp encoding 201 amino acids. The LsMYB4 protein had a conserved R2R3-MYB domain and the amino acids sequence shared up to 96% homelogies with anthycyanin biosynthesis-related R2R3-MYB transcription factor in Narcissus tazetta. The expression analysis by real time qRT-PCR showed that LsMYB4 was expressed in different tissues and flowering periods. The expression level in petal was almost ten times higher than in leaf. And in florescence period the expression of LsMYB4 was twenty times higher than in early budding period. The LsMYB4 expressed discrepantly in four clones of L. sprengeri,and results of it implicated that the lighter flower color,the higher expression level. This showed that LsMYB4 played a possibly negative role in anthocyanin biosynthesis of Lycoris sprengeri.
Key words:Lycoris sprengeri;MYB;cloning;expression analysis
石蒜属(Lycoris)植物花形及花色丰富(秦卫华 等,2003),又因为开放在少花的夏末秋初闷热时节,而被广泛应用于园林绿化等(刘志高 等,2008;黄春红 等,2013)。换锦花(Lycoris sprengeri)为石蒜属植物的一种,其花为喇叭状,花色多为红色、紫红色(时剑 等,2011),其中花被裂片顶 收稿日期:2014–06–03;修回日期:2014–09–12
基金项目:浙江省花卉新品种选育重大科技专项重点项目(2012C12909-14)
* 通信作者 Author for correspondence(E-mail:gaoyanhui408@http://doc.guandang.net)
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