王小龙;李节法;张才喜;王世平;许文平;

• 1:上海交通大学农业与生物学院

摘要(Abstract)：

【目的】分离和克隆梨过敏原蛋白基因Ppmal(Gen Bank登录号为KP008110),探讨其在梨果实发育过程中的功能。【方法】以砂梨品种‘翠冠’[Pyrus pyrifolia(Burm.f.)Nakai]为试材,在盛花期后30 d对植株果柄进行涂抹赤霉素处理,利用同源克隆和RACE方法克隆目的基因全长序列,并通过实时荧光定量技术和半定量技术分析该基因在梨不同组织以及梨果实发育过程中的表达变化。【结果】Ppmal的全长是906 bp,含有480 bp的开放阅读框(ORF),编码159个氨基酸,预测的蛋白质相对分子质量为17.56 k D,等电点为5.62。生物信息学分析显示该基因没有信号肽序列,没有跨膜结构域,具亲水性。与其他物种的过敏原蛋白基因核苷酸序列同源性超过75%,与苹果和西洋梨编码的氨基酸序列同源性分别高达97.48%和96.23%,进化树分析表明该基因与苹果的进化关系最近。同时,定量结果显示经过赤霉素处理后的果实中该基因的表达量随着果实的生长发育呈现先降低后升高的趋势,并且具有组织差异表达的特点,其表达量在叶片中最大,其次是嫩叶,再次是花,枝条最低。【结论】获得梨Ppmal基因全长,对该基因在砂梨品种‘翠冠’发育过程中的表达分析显示,Ppmal受到赤霉素的调控,并在砂梨果实膨大期发生上调表达。

关键词(KeyWords)： 砂梨;RACE;荧光定量;赤霉素

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目(31070245);; 教育部新世纪人才支持项目(NCET-10-0582);; 晨星青年学者奖励计划(AE1500006)

作者(Author): 王小龙;李节法;张才喜;王世平;许文平;

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DOI:

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