花青素苷合成途径中结构基因的表达对菊花和瓜叶菊花色的影响
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摘要
菊花(Chrysanthemum x morifolium Ramat.)是中国传统名花,其花色变异丰富,但独缺蓝色系;瓜叶菊(Senecio cruentus Masson ex L'Herit; Pericallis cruenta L'Herit)是菊科千里光属广泛栽培的观赏植物,具有典型的蓝色系。本研究通过对比菊花和瓜叶菊花青素苷生物合成途径上关键结构基因的表达差异,探讨菊花蓝色系缺失的原因,分析花发育过程中蓝色花形成的分子生物学机理,对于开展花色改良的分子育种具有重要的理论意义和实际应用价值。此外,本研究通过探讨结构基因表达和花色表现之间的关系,期望为花色基因工程育种提供更多的基因资源和参考依据。本研究主要取得了如下成果:
     1.花色表现是由色素组成决定的。将瓜叶菊品种‘春潮’和菊花品种‘丽金’分为4个色系,初步测定瓜叶菊白色系中仅含有黄酮类化合物;瓜叶菊红色系、紫色系、蓝色系和菊花粉色系中含有黄酮类化合物和花青素苷;菊花黄色系中含有黄酮类化合物、花青素苷和类胡萝卜素;
     2.分离得到了与花青素苷合成途径中相关的关键结构基因。利用RT-PCR的方法分离了菊花花青素苷合成途径中关键结构基因的cDNA全长:CHI、F3H, F3'H和ANS,以及瓜叶菊ANS cDNA全长和4个结构基因片段:CHS、CHI、F3H、F3'H。对这些基因进行的生物信息学分析显示:上述基因编码的氨基酸序列与其它物种同源基因相比一致性较高;在氨基酸序列上具有重要的酶活性位点和保守的功能结构域;推测菊花CHI和F3H是亲水性较强的蛋白,而菊花F3'H、ANS和瓜叶菊ANS是跨膜蛋白。
     3.采用半定量RT-PCR的方法分析CHS, CHI, F3H, F3'H, DFR、F3’5’H、3MaT这7个结构基因在瓜叶菊不同色系以及舌状花不同发育阶段的表达模式。结果表明:在白色花中,不存在CHS的表达;在红色花中,检测到F3’H基因的高丰度表达,但没有检测到F3’5’H的转录本;在蓝色花中,没有F3’H表达的信号,但在花序开放的第Ⅰ阶段有较强的F3’5’H的表达信号;而在紫色花中,可以同时检测到F3’H和F3’5’H的转录本。此外,瓜叶菊花青素苷合成相关结构基因在花序开放初期高丰度表达,随后逐渐降低,在第Ⅳ阶段表达量再次出现升高现象,而在花序开放末期表达量极低或没有表达信号。
     4.对菊花品种‘丽金’不同色系舌状花中关键结构基因的表达模式分析表明,结构基因的表达量伴随着花序的开放呈现先上升后下降的趋势,大部分基因的表达高峰期出现在花序发育的第Ⅱ或第Ⅲ阶段;在舌状花开放末期,几乎检测不到基因表达的信号。F3’H和ANS在紫色花的第Ⅰ阶段表达量最高,而CHS、F3H和DFR在第Ⅱ或第Ⅲ阶段高丰度表达;结构基因在粉色系和红色系舌状花中的表达模式类似,但在粉色花中,F3’H的平均表达量低于红色花和紫色花。
     5.关键结构基因在瓜叶菊和菊花不同组织器官中的表达结果表明,根中检测不到任何基因的转录本,除了DFR和ANS是花器官特异表达的基因外,F3’5’H在瓜叶菊舌状花和叶片中表达,而其余基因则在茎、叶中均有表达。
     6.黑暗和高温处理菊花红色系、紫色系品种发现,舌状花不能正常呈色或严重褪色。基因表达分析表明,黑暗处理后,调节基因MYB和结构基因CHI、F3H, F3’H、DFR、ANS的表达受到抑制,WD40和CHS的表达丰度减弱,推测MYB是调控结构基因表达的重要转录因子;在菊花花青素苷合成相关结构基因的启动子上,可能存在光响应元件,可以与MYB相结合。高温会抑制菊花花序发育中、后期阶段的结构基因表达,但对发育前期基因的表达影响较弱,推测高温影响了菊花花青素苷合成相关基因的表达及花青素苷的稳定性;但高温处理后,调节基因MYB和WD40的表达量均有所上升,推测转录因子除了与菊花花色形成相关外,还可能与菊花的抗逆性有关。
     7.对比瓜叶菊和菊花花青素苷呈色的差异,以及结构基因的表达模式,可得到以下结论:(1)基因表达是花色表现的根本原因;(2)菊花缺少蓝色系的主要原因是其体内没有F3’5’H基因的表达,且与之竞争底物的F3’H基因表达量较强,因此F3’H和F3’5’H是决定蓝色花能否形成的两个关键基因;(3)光照和温度与菊花舌状花呈色密切相关。
Chrysanthemum (Chrysanthemum×morifolium Ramat.) is one of the traditional cut flowers and pot flowers in China. Blue-flowering is the only type absent from colorful chrysanthemum varieties. Cineraria (Senecio cruentus Masson ex L'Herit; Pericallis cruentia L'Herit), which has blue varieties, is a popular potted flower in spring available at local markets in China. In this study, the difference on gene expression patterns involved in anthocyanin biosynthesis between cineraria and chrysanthemum was compared. It is helpful to explain the reasons and the molecular mechanism of the lack of blue-flowering chrysanthemum. These kinds of studies have important academic significances and practical values. There are 7 major results in this study.
     (1) According to phenotype of flower coloration, chrysanthemum‘Regan’and cineraria‘Chunchao’were divided into 4 color series. In white ray florets of cineraria, flavonoids were major pigment. There were flavonoids and anthocyanins in cineraria red, purple and blue ray florets, and in chrysanthemum pink ray florets. Carotenoids were detected in yellow ray florets of chrysanthemum.
     (2) Using semi-quantitative reverse transcriptase polymerase chain reaction (RT-PCR), this study isolated four internal segments and one full-length cDNA from cineraria flowers: chalcone synthase(CHS), chalcone isomerase (CHI), flavanone 3-hydroxylase (F3H), flavonoid 3'-hydroxylase (F3'H) and anthocyanidin synthase (ANS). In addition, four full-length cDNAs from chrysanthemum flowers were isolated by RT-PCR and PCR-RACE: chalcone isomerase (CHI), flavanone 3-hydroxylase (F3H), flavonoid 3'-hydroxylase (F3'H) and anthocyanidin synthase (ANS). The results of bioinformation suggested that key structual genes shared about 60%-93% homology with the accessed genes from other species in GenBank. And the putative protein contained conserved domains. CHI and F3H from chrysanthemum were considered hydrophilic proteins, F3'H and ANS may be membrane proteins.
     (3) The expression patterns of CHS, CHI, F3H, F3'H, DFR, flavonoid 3',5'-hydroxylase (F3'5'H) and anthocyanin 3-O-glucoside-6"-O -malonyltransferase (3MaT) in five developmental stages of cineraria with different flower colors were determined for the first time by RT-PCR. The results indicated that there is no CHS transcript in white flowers, In red flowers, F3'H mRNA was expressed at high level. But no F3'5'H transcript was found. F3'5'H was highly expressed in Stage I but no F3'H mRNA was observed in blue flowers. And the transcripts of F3'H and F3'5'H were found in purple petals. In addition, these genes were expressed at high level in early stage and underwent moderate decreases in expression. Interestingly, genes expression level increased again in Stage IV. However, in Stage V, there is little expression level could be detected in petals.
     (4) During seven developmental stages of chrysanthemum, most of genes were highly expressed in Stage II or Stage III and underwent moderate decreases. Little expression level could be detected in ray floret in Stage VII. CmF3'H mRNA were expressed at high level in Stage I in purple flowers. Average levels of CmF3'H expression in pink ray floret are lower than in red and purple ray florets.
     (5) Expression of the structral genes in different tissues showed that they were not detected in roots. DFR and ANS were floral organ-specific genes. F3'5'H transcripts was detected in ray florets and leaves. Other genes expressed both in stems and leaves.
     (6) After dark and high temperature treatment, chrysanthemum ray florets faded seriously. When inflorescences from Stage I were covered with aluminium foil, the gene expression of MYB and the expression of CHI, F3H, F3'H, DFR, ANS were inhibited. This results implyed that MYB was a key transcriptional factor regulating structural genes expression. However, MYB and WD40 were up-regulated after high temperature treatment, whereas the expression of most structural genes were inhibited in middle and late stages. It can be speculated that high temperature influenced the stability of anthocyanin. Furthermore, MYB and WD40 might be related to stress of chrysanthemum.
     (7) According to our results, it could be concluded that gene expression was the underlying causes of flower pigmentation. Besides, there are two key reasons of the lack of blue-flowering chrysanthemum:(1) F3'5'H gene deletion; (2) F3'H strongly expressed. Light and temperature were closely related to chrysanthemum ray florets pigmentation.
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