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黄瓜白粉病抗性基因挖掘结论及参考文献

来源:学术堂 作者:周老师
发布于:2016-03-19 共7750字

本篇论文目录导航:

  【题目】黄瓜白粉病基因的遗传与QTL定位研究
  【第一章】黄瓜白粉病抗病基因探析绪论
  【第二章】黄瓜种质PI200815抗白粉病基因定位研究
  【第三章】黄瓜白粉病抗病基因的全基因组关联分析
  【结论/参考文献】黄瓜白粉病抗性基因挖掘结论及参考文献

  第四章 全文结论

  1.本研究利用高抗白粉病种质 PI 200815 与感病亲本 931 进行杂交自交,构建遗传群体,利用苗期人工喷雾接种,对双亲和遗传群体进行抗病性鉴定,利用病情指数对白粉病抗性进行遗传分析,结果表明,F2和 F2:3后代的病情指数呈连续近正态分布,表明 PI200815 的白粉病抗性是由多基因控制的数量性状。

  2.利用 F2遗传群体构建了一张包含 129 个 SSR 分子标记的连锁图谱,覆盖基因组长度857.9cM,标记间平均遗传距离为 6.65cM。

  3.利用构建的遗传图谱,结合三季度的抗病性鉴定结果,对 PI200815 中的抗病基因进行了QTL 分析,2013 年春,检测到两个 QTL 位点:pmQTL1.1 和 pmQTL6.1,LOD 值分别为 4.6 和 3.3,表型解释率分别为 10%和 7%。2014 年春,只检测到一个 QTL 位点 pmQTL1.1,LOD 值达到了15.3,表型解释率达到了 37.9%。2014 年秋,同样只检测到 pmQTL1.1,LOD 值为 4.9,表型解释率达到了 21.6%。三个季度共同检测到一个 QTL 位点 pmQTL1.1,位于黄瓜 1 号染色体标记SSR03860-SSR14445 之间,物理距离为 689Kb。

  4.针对白粉病抗性主效 QTL 定位区域进行候选基因预测,发现目标区域有 95 个预测基因,功能与抗病相关的基因有 10 个。包含 2 个 NBS 类抗病蛋白,5 个抵御素类似基因,2 个逆境调控蛋白,和 1 个调控植物程序性死亡基因。

  5.利用已完成全基因组重测序的黄瓜核心种质,对白粉病抗性基因进行了三个季度的 GWAS分析,检测到 6 个信号位点(pmG1.1,pmG2.1,pmG4.1,pmG5.1,pmG5.2 和 pmG5.3),其中pmG2.1、pmG5.2 和 pmG5.3 在三季度中都被监测到,同时将 GWAS 结果与前人研究比较,发现其中有三个位点(pmG1.1,pmG5.2,pmG5.3)与前人 QTL 定位结果吻合。

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  致 谢

  时间飞逝,转眼间,三年的研究生求学生活即将结束,站在毕业的门槛上,回首往昔,感概万千。值此毕业论文完成之际,我谨向所有关心、爱护、帮助我的人们表示最诚挚的感谢与最美好的祝愿。

  首先,感谢我的导师张圣平副研究员。本论文是在导师张老师的悉心指导之下完成的。三年来,导师渊博的专业知识,严谨的治学态度,精益求精的工作作风,诲人不倦的高尚师德,朴实无华、平易近人的人格魅力对我影响深远。导师不仅授我以文,而且教我做人,虽历时三载,却赋予我终生受益无穷之道。本论文从选题到完成,每一步都是在导师的指导下完成的,倾注了导师大量的心血,在此我向我的导师张圣平老师表示我最诚挚的敬意和最衷心的感谢!离别的时刻,我要衷心地说一声,感谢您!我将带着您赐予的财富,信心百倍的迎接明天的挑战。

  本论文的完成也离不开其他各位老师、同学和朋友的关心与帮助。在此也要感谢顾兴芳老师在论文开题、初稿、预答辩等期间所提出的宝贵意见。还要感谢中国农业科学院蔬菜花卉研究所病害组的谢丙炎老师和杨宇红老师提供进行病害实验的各种帮助以及功能基因课题组对 GWAS研究上给予的技术和数据的支持。感谢苗晗老师、王烨老师耐心的指导和帮助。

  衷心感谢答辩委员会的各位老师们,你们百忙之中抽出时间来审阅我的论文,为我指点迷津。

  感谢刘书林师兄、王敏师姐在我实验过程中给予的指导和帮助以及在开题和论文写作过程中给予的修改和指导。感谢徐采清老师,田桂丽同学以及刘盼娜、崔金莹、谢笑笑,张松,宋子超师弟师妹们在我的实验过程中的帮助和支持,你们无私的帮助和默默的支持是我完成学业的坚强后盾,很珍视与你们一起走过的日子。

  同时也要感谢我的同班同学们,谢谢你们平时对我的关心与帮助,。谢谢你们大家给我一路走来的陪伴和帮助。

  感谢给我的学业无限支持的父母,感谢你们竭尽所能地为我提供良好的学习环境,给予了我健康的体魄,诚朴正直的品质,这些都是我受益终身的财富。感谢我的姐姐和姐夫、弟弟和妹妹,感谢所有亲人们给予我成长的关怀,祝你们永远健康平安。

  最后,向培养我的中国农业科学院全体领导和老师,向你们致以崇高的敬意。向所有提及和未提及的给予我帮助、支持和鼓励的人们表示我最真挚的感谢和最美好的祝愿。

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