香蕉MaTPS3基因序列及表达特性分析

通过随机克隆测序的方法从香蕉根系cDNA文库中获得海藻糖合成酶基因,命名为MaTPS3。Ma7R;3扩增获得的cDNA序列全长为2874bp,包含一个完整的开放阅读框1971bp,编码蛋白含656个氨基酸。其氨基酸理化性质分析表明,MaTPS3蛋白属于不稳定、疏水性蛋白蛋白,等电点p16.26,具有两个结构域TPS和TPP;序列预测分析表明,MaTPS3蛋白定位于细胞质中,该蛋白含一个跨膜区域,不存在信号肽。通过与已知植物的TPS氨基酸同源序列比对,相似性为67.31%;其中与印度水稻、蒺藜状苜蓿TPS氨基酸的进化关系较近,同源性分别为55.13%、54.71%。器官特异性分析表明,MaTPS...

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Published in广东农业科学 Vol. 42; no. 22; pp. 106 - 112
Main Author 许桂莺 李科明 舒海燕 王安邦 常胜和 孙威 宋顺 许奕 金志强
Format Journal Article
LanguageChinese
Published 中国热带农业科学院海口实验站,海南海口570102 2015
中国热带农业科学院橡胶研究所,海南海口571737
华中农业大学农学院,湖北武汉430070%中国热带农业科学院海口实验站,海南海口,570102%中国热带农业科学院海口实验站,海南海口570102
华中农业大学农学院,湖北武汉430070
中国热带农业科学院热带作物生物技术研究所,海南海口571101
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Summary:通过随机克隆测序的方法从香蕉根系cDNA文库中获得海藻糖合成酶基因,命名为MaTPS3。Ma7R;3扩增获得的cDNA序列全长为2874bp,包含一个完整的开放阅读框1971bp,编码蛋白含656个氨基酸。其氨基酸理化性质分析表明,MaTPS3蛋白属于不稳定、疏水性蛋白蛋白,等电点p16.26,具有两个结构域TPS和TPP;序列预测分析表明,MaTPS3蛋白定位于细胞质中,该蛋白含一个跨膜区域,不存在信号肽。通过与已知植物的TPS氨基酸同源序列比对,相似性为67.31%;其中与印度水稻、蒺藜状苜蓿TPS氨基酸的进化关系较近,同源性分别为55.13%、54.71%。器官特异性分析表明,MaTPS3在香蕉植株的根、球茎、假茎、叶、花、果实各器官中均有表达,在叶片和花中表达量较多。qPCR分析表明,盐胁迫下MaTPS3表达量增加,于24h时达到最高;在冷胁迫处理下,MaTPS3表达量较0h时则明显下调;ACC胁迫处理下,MaTPS3表达量逐渐增加,在24h表达量为0h时4倍。巴拿马病菌4号生理小种(Foc4)侵染后,MaTPS3在根系中下调表达,在24h时表达量显著低于0h时。因此,MaTPS3可能参与调控香蕉抗盐胁迫机制,从而提高香蕉耐盐件.并参与调控植物激素生物合成。
Bibliography:44-1267/S
A full-length MaTPS3 of 2 874 bp from banana roots cDNA library was obtained. It contained a complete open reading frame of 1 971 bp length, encoding 656 amino acids. Biological information analysis indicated that MaTPS3 protein belonged to the unstable protein, with isoelectric point of 6.26 and two domains TPS and TPP. Sequence prediction analysis indicated MaTPS3 protein was a hydrophobic transmembrane protein without signal peptide and located in cytoplasm. MaTPS3 protein sequence had 67.31% homology with other known plant TPS. Phylogenetic analysis indicated that MaTPS3 protein was closer with Oryza sativa Indica Group and Medicago truncatula, their homology respectively was 55.13%, 54.71%. Organ-specific analysis showed that MaTPS3 was expressed in bananaroots, corms, pseudo stems, leaves, flowers and fruits, but higher in leaves and flowers, qPCR analysis showed that the expression of MaTPS3 increased under salt stress, reached the highest at 24 h. The expression of MaTPS3 was significantly lo
ISSN:1004-874X