【第一章】黃瓜白粉病抗病基因探析緒論
【第二章】黃瓜種質PI200815抗白粉病基因定位研究
【第三章】黃瓜白粉病抗病基因的全基因組關聯分析
【結論/參考文獻】黃瓜白粉病抗性基因挖掘結論及參考文獻
第四章 全文結論
1.本研究利用高抗白粉病種質 PI 200815 與感病親本 931 進行雜交自交,構建遺傳群體,利用苗期人工噴霧接種,對雙親和遺傳群體進行抗病性鑒定,利用病情指數對白粉病抗性進行遺傳分析,結果表明,F2和 F2:3后代的病情指數呈連續近正態分布,表明 PI200815 的白粉病抗性是由多基因控制的數量性狀。
2.利用 F2遺傳群體構建了一張包含 129 個 SSR 分子標記的連鎖圖譜,覆蓋基因組長度857.9cM,標記間平均遺傳距離為 6.65cM。
3.利用構建的遺傳圖譜,結合三季度的抗病性鑒定結果,對 PI200815 中的抗病基因進行了QTL 分析,2013 年春,檢測到兩個 QTL 位點:pmQTL1.1 和 pmQTL6.1,LOD 值分別為 4.6 和 3.3,表型解釋率分別為 10%和 7%。2014 年春,只檢測到一個 QTL 位點 pmQTL1.1,LOD 值達到了15.3,表型解釋率達到了 37.9%。2014 年秋,同樣只檢測到 pmQTL1.1,LOD 值為 4.9,表型解釋率達到了 21.6%。三個季度共同檢測到一個 QTL 位點 pmQTL1.1,位于黃瓜 1 號染色體標記SSR03860-SSR14445 之間,物理距離為 689Kb。
4.針對白粉病抗性主效 QTL 定位區域進行候選基因預測,發現目標區域有 95 個預測基因,功能與抗病相關的基因有 10 個。包含 2 個 NBS 類抗病蛋白,5 個抵御素類似基因,2 個逆境調控蛋白,和 1 個調控植物程序性死亡基因。
5.利用已完成全基因組重測序的黃瓜核心種質,對白粉病抗性基因進行了三個季度的 GWAS分析,檢測到 6 個信號位點(pmG1.1,pmG2.1,pmG4.1,pmG5.1,pmG5.2 和 pmG5.3),其中pmG2.1、pmG5.2 和 pmG5.3 在三季度中都被監測到,同時將 GWAS 結果與前人研究比較,發現其中有三個位點(pmG1.1,pmG5.2,pmG5.3)與前人 QTL 定位結果吻合。
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致 謝
時間飛逝,轉眼間,三年的研究生求學生活即將結束,站在畢業的門檻上,回首往昔,感概萬千。值此畢業論文完成之際,我謹向所有關心、愛護、幫助我的人們表示最誠摯的感謝與最美好的祝愿。
首先,感謝我的導師張圣平副研究員。本論文是在導師張老師的悉心指導之下完成的。三年來,導師淵博的專業知識,嚴謹的治學態度,精益求精的工作作風,誨人不倦的高尚師德,樸實無華、平易近人的人格魅力對我影響深遠。導師不僅授我以文,而且教我做人,雖歷時三載,卻賦予我終生受益無窮之道。本論文從選題到完成,每一步都是在導師的指導下完成的,傾注了導師大量的心血,在此我向我的導師張圣平老師表示我最誠摯的敬意和最衷心的感謝!離別的時刻,我要衷心地說一聲,感謝您!我將帶著您賜予的財富,信心百倍的迎接明天的挑戰。
本論文的完成也離不開其他各位老師、同學和朋友的關心與幫助。在此也要感謝顧興芳老師在論文開題、初稿、預答辯等期間所提出的寶貴意見。還要感謝中國農業科學院蔬菜花卉研究所病害組的謝丙炎老師和楊宇紅老師提供進行病害實驗的各種幫助以及功能基因課題組對 GWAS研究上給予的技術和數據的支持。感謝苗晗老師、王燁老師耐心的指導和幫助。
衷心感謝答辯委員會的各位老師們,你們百忙之中抽出時間來審閱我的論文,為我指點迷津。
感謝劉書林師兄、王敏師姐在我實驗過程中給予的指導和幫助以及在開題和論文寫作過程中給予的修改和指導。感謝徐采清老師,田桂麗同學以及劉盼娜、崔金瑩、謝笑笑,張松,宋子超師弟師妹們在我的實驗過程中的幫助和支持,你們無私的幫助和默默的支持是我完成學業的堅強后盾,很珍視與你們一起走過的日子。
同時也要感謝我的同班同學們,謝謝你們平時對我的關心與幫助,。謝謝你們大家給我一路走來的陪伴和幫助。
感謝給我的學業無限支持的父母,感謝你們竭盡所能地為我提供良好的學習環境,給予了我健康的體魄,誠樸正直的品質,這些都是我受益終身的財富。感謝我的姐姐和姐夫、弟弟和妹妹,感謝所有親人們給予我成長的關懷,祝你們永遠健康平安。
最后,向培養我的中國農業科學院全體領導和老師,向你們致以崇高的敬意。向所有提及和未提及的給予我幫助、支持和鼓勵的人們表示我最真摯的感謝和最美好的祝愿。