作物学报 ›› 2014, Vol. 40 ›› Issue (02): 253-263.doi: 10.3724/SP.J.1006.2014.00253
牛俊奇1,2,王爱勤1,2,黄静丽1,2,杨丽涛1,2,3*,李杨瑞2,3,4*
NIU Jun-Qi1,2,HUANG Jing-Li1,2,WANG Ai-Qing1,2,YANG Li-Tao1,2,3,*,LI Yang-Rui2,3,4,*
摘要:
中性/碱性转化酶(Alkaline/Neutral Invertase)能不可逆地催化蔗糖分解为葡萄糖和果糖, 在植物生长发育中起重要作用。本研究采用RT-PCR和RACE技术从甘蔗品种GT28心叶中克隆到甘蔗中性/碱性转化酶基因全长cDNA序列, 基因命名为SoNIN1。该基因全长2289 bp (GenBank登录号为JX109944), 开放阅读框为1812 bp, 编码603个氨基酸, 相对分子量为67.79 kD, 等电点为6.41。具有中性/碱性转化酶保守结构域, N-端不含跨膜结构和信号肽。其编码氨基酸序列与玉米、水稻和黑麦草的亲缘关系较近, 属于同一进化分支。利用染色体步移技术克隆到SoNIN1基因5¢侧翼启动子序列, 长度为1174 bp (GenBank登录号为KC854419)。启动子序列含有多个CAAT-box和TATA-box等基本作用元件, 参与分生组织特异性激活, 参与干旱诱导的MYB结合位点, 脱落酸、茉莉酸甲酯和赤霉素响应等作用元件。利用实时荧光定量PCR技术, 在生理成熟期甘蔗茎、叶、花序和芽中均能检测到SoNIN1的表达, 其表达量在叶中最高, 芽中次之, 而在+1节间最低。苗期根和叶中SoNIN1基因都受PEG和NaCl诱导表达。
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