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水稻黄单胞细菌Harpin蛋白的遗传多样性及其诱导烟草过敏反应和抗病性功能 被引量:7

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摘要 利用PCR方法从水稻黄单胞细菌(Xanthomonasoryzae)两个致病变种(pv.oryzae和pv.oryzicola)的12个菌株中,扩增出了编码诱导植物过敏反应蛋白激发子Harpin的3类hrfA(hypersensitiveresponsefunctioningfactorA)同源基因hrf1,hrf2和hrf3.同源性分析表明,这些同源基因推测的编码产物均富含甘氨酸,缺乏酪氨酸,在序列的第45位附近的氨基酸都有一个半胱氨酸.HarpinXoo由来源于水稻白叶枯病菌的hrfA基因编码,产物包括两类,一类代表菌株为JxoⅢ,其中GGG-GG基序的重复数为3个,分子量为15.6kD;另一类代表菌株为Pxo112,产物中GGG-GG基序的重复数为4个,分子量为15.9kD,这两个基因分别命名为hrf1和hrf3.HarpinXooc由来源于水稻条斑病细菌的hrfA基因编码,代表菌株为RS105,其中GGG-GG重复数为2个,分子量为15.3kD,水稻黄单胞菌Harpin分子中的一个半胱氨酸残基是其特有的.将这3类基因与已报道的hpa1和xop1基因编码的氨基酸序列进行聚类分析,结果可以将其分为4类,来源于水稻黄单胞菌的HarpinXoo和HarpinXooc被分在相邻的两类中.对3种产物进行比较研究结果,在相同条件下3个代表菌株JxoⅢ,RS105和Pxo112的hrfA基因(hrf1,hrf2和hrf3)表达蛋白的相对浓度分别为:0.389,0.530,0.083mg/mL.hrf1,hrf2和hrf3在大肠杆菌(Bl21)
出处 《中国科学(C辑)》 CSCD 北大核心 2004年第2期136-143,共8页 Science in China(Series C)
基金 国家重点基础研究发展规划项目(批准号:G2000016201) 国家自然科学基金项目(批准号:A200229) 南京市科技计划项目(批准号: 2002ZB0114)
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参考文献17

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