生物技术通报 ›› 2022, Vol. 38 ›› Issue (4): 72-78.doi: 10.13560/j.cnki.biotech.bull.1985.2021-1537

• 作物品质遗传与改良专题(专题主编: 刘巧泉 教授) • 上一篇    下一篇

甘蔗单糖转运蛋白基因ShSTP7序列分析及组织表达特征测定

赵婷婷(), 王俊刚, 王文治, 冯翠莲, 冯小艳, 张树珍()   

  1. 中国热带农业科学院热带生物技术研究所 农业农村部热带作物生物学与遗传资源利用重点实验室 海南热带农业资源研究院 海南省热带农业生物资源保护与利用重点实验室 中国热带农业科学院甘蔗研究中心,海口 571101
  • 收稿日期:2021-12-09 出版日期:2022-04-26 发布日期:2022-05-06
  • 通讯作者: 张树珍,女,博士,研究员,研究方向:甘蔗生物技术;E-mail: zhangsz2007@163.com
  • 作者简介:赵婷婷,女,博士,助理研究员,研究方向:甘蔗基因工程;E-mail: zhaotingting@itbb.org.cn
  • 基金资助:
    国家自然科学基金项目(31901593);国家重点研发计划资助(2018YFD1000503);现代农业产业技术体系建设专项资金(CARS-170301)

Sequence and Tissue Expression Analysis of Monosaccharide Transporter Gene ShSTP7 in Sugarcane

ZHAO Ting-ting(), WANG Jun-gang, WANG Wen-zhi, FENG Cui-lian, FENG Xiao-yan, ZHANG Shu-zhen()   

  1. Institute of Tropical Bioscience and Biotechnology of Chinese Academy of Tropical Agricultural Sciences,Key Laboratory of Biology and Genetic Resources of Tropical Crops/Key Laboratory for Biology and Genetic Resources of Tropical Crops of Hainan Province,Hainan Institute for Tropical Agricultural Resources/Sugarcane Research Center of Chinese Academy of Tropical Agricultural Sciences,Ministry of Agriculture and Rural Affairs,Haikou 571101
  • Received:2021-12-09 Published:2022-04-26 Online:2022-05-06

摘要:

糖转运蛋白基因在调控甘蔗产量形成、糖分积累过程中发挥重要作用,对其功能研究有助于揭示甘蔗糖分积累机制及其在甘蔗品种遗传改良上的应用。利用RT-PCR、Real-time PCR、原生质体亚细胞定位等技术,分离甘蔗中单糖转运蛋白基因ShSTP7,并对其编码蛋白生物学特性、亚细胞定位情况及ShSTP7基因表达模式进行分析。结果表明从甘蔗叶中克隆出1 619 bp ShSTP7 cDNA序列,其中包含1 557 bp完整阅读框,编码518个氨基酸;ShSTP7编码蛋白ShSTP7属于易化扩散超家族单糖转运蛋白家族成员,含有12个跨膜结构域及STP糖转运保守结构域,与割手密、高粱、玉米STP7高度同源;ShSTP7-GFP融合蛋白定位于细胞膜;ShSTP7主要在甘蔗叶片中表达,茎秆中表达量低,在高糖甘蔗茎尖未成熟1-3茎节中的表达量高于低糖甘蔗,在高糖甘蔗叶和第4-24茎节中的表达低于低糖甘蔗。这些研究结果表明甘蔗中ShSTP7是一种细胞膜单糖转运蛋白,可能负责质外体中单糖的吸收,在甘蔗叶片糖分运输过程中发挥重要作用,研究结果将为解析甘蔗中单糖转运蛋白基因功能及应用奠定基础。

关键词: 单糖转运蛋白, ShSTP7, 糖吸收, 表达分析, 亚细胞定位, 甘蔗

Abstract:

Sugar transporter protein(ST)genes play important roles on yield formation and sugar accumulation in sugarcane(Saccharum spp. hybrids). The function analysis of ST genes facilitates to clarify the sugar accumulation mechanism and sugarcane genetic improvement. The ST gene ShSTP7 was isolated from sugarcane,and its biological characteristics,subcellular location and expression pattern of ShSTP7 were analyzed by bioinformatics software and techniques including RT-PCR,real-time PCR and protoplast subcellular location. The results showed that a sugar transporter gene ShSTP7 cDNA was isolated from sugarcane leaves. This gene was 1 619 bp length containing 1 557 bp open reading frame and encoded 518 amino acids. ShSTP7-encoded protein ShSTP7 belonged to facilitated diffusion superfamily and sugar transporter family. It had 12 transmembrane structures and sugar transport conserve domain. ShSTP7 was highly homologous with STP7 from S. spontaneum,Zay mays and Sorghum bicolor. The subcellular location analysis indicated that the green fluorescence signal of ShSTP7-GFP fusion protein appeared in the region of plasma membrane. The expression analysis of ShSTP7 demonstrated that it mainly expressed in sugarcane leaves and less expressed in sugarcane stalks. The expression of ShSTP7 in immature internodes 1-3 of high-sugar-content sugarcane cultivar was higher than that of low-sugar-content sugarcane cultivar. However,the expression of ShSTP7 in the leaves and internodes 4-24 of high-sugar-content sugarcane cultivar was lower than that of low-sugar-content sugarcane cultivar. These results indicate that ShSTP7 is a sugar transporter on plasma membrane uptaking sugars from apoplasmic space and plays an important role on sugar transport in sugarcane leaves,which lays a foundation in clarifying the gene function of monosaccharide transporters and its application.

Key words: monosaccharide transporter protein, ShSTP7, sugar uptake, expression analysis, subcellular location, Saccharum spp. hybrids