作物学报 ›› 2014, Vol. 40 ›› Issue (06): 1002-1010.doi: 10.3724/SP.J.1006.2014.01002
宋修鹏1,张保青2,黄杏2,杨丽涛1,2,*,李杨瑞1,2,*
SONG Xiu-Peng1,ZHANG Bao-Qing2,HUANG Xing2,YANG Li-Tao1,2,*,LI Yang-Rui1,2,*
摘要:
利用RT-PCR和RACE技术从甘蔗品种新台糖22号(ROC 22)中克隆获得SAM基因的cDNA序列,命名为ScSAM,GenBank登录号为KC172558。用生物信息学方法预测分析其序列,cDNA全长1466 bp,含有1个1191 bp的完整开放阅读框(ORF),编码396个氨基酸,与高粱和玉米等植物的SAM蛋白有很高的相似性。系统进化树分析显示,甘蔗ScSAM与高粱的SAM蛋白亲缘关系较近。Real-time PCR分析表明ScSAM为组成型表达,在根中的表达量最高,是叶中表达量的3.6倍。其在黑穗病菌胁迫和低温(4℃)、聚乙二醇(PEG)、NaCl非生物胁迫下均被诱导表达,但表达模式不同;在H2O2胁迫下其表达被抑制。推测其可能参与甘蔗抗黑穗病过程,且在甘蔗抗寒、抗旱、抗盐和抗氧化等胁迫过程中也起某种作用。
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