·常規(guī)信息 最近更新:2021年2月13日 21:42:00 | |||||||||||||
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基因(座)名稱 | 白葉枯病抗性基因; 細(xì)菌性條斑病抗性基因; 轉(zhuǎn)錄因子ⅡAγ亞基 Bacterial Blight resistance 5; Resistance to Bacterial Leaf Streak; transcription factor IIA gamma subunit 5 | ||||||||||||
基因符號(hào) | xa5; OsTFIIAγ5; qBlsr5a | ||||||||||||
所在染色體 | 5 (已克。 | ||||||||||||
qBlsr5a(LOC_Os05g01710, Xie et al. 2014), xa5(AY643717/AF532975, Iyer et al. 2004), TFIIAγ5(Jiang et al. 2006), 位于同一基因位點(diǎn)... xa5是抗白葉枯病隱性基因,同時(shí)對(duì)細(xì)菌性條斑病可能也具有抗性。 【定位與克隆】xa5位于5號(hào)染色體,cDNA全長(zhǎng)906bp,包含有3個(gè)外顯子,編碼一個(gè)由106氨基酸組成的蛋白產(chǎn)物,該蛋白產(chǎn)物是一個(gè)轉(zhuǎn)錄因子ⅡA的γ亞基(TFⅡAγ)。與先前發(fā)現(xiàn)的抗病基因不同,TFⅡAγ是真核生物的轉(zhuǎn)錄因子,但其在抗病基因中的作用以前未知。xa5在抗病品種IRBB5和感病品種日本晴及IR24中有兩個(gè)堿基的差異,導(dǎo)致IRBB5中的第39位的纈氨酸在日本晴及IR24中變成谷氨酸。xa5的3'-UTR在IRBB5和IR24之間發(fā)生5bp的置換,但發(fā)生置換的這5bp在IRBB5和日本晴中是一樣的,說明這個(gè)差異并不引起抗病性的差異。 xa5是一個(gè)隱性抗病基因,其基因結(jié)構(gòu)與其他典型的抗病基因的結(jié)構(gòu)都不一樣。xa5的序列在抗病和感病品種中有兩個(gè)堿基的差異導(dǎo)致一個(gè)氨基酸的改變(纈氨酸變成谷氨酸),該氨基酸位點(diǎn)位于蛋白三維結(jié)構(gòu)的表面,可能與蛋白的相互作用有關(guān)。該氨基酸位點(diǎn)的差異引起抗病性的差異在其他抗病和感病品種中也存在,說明xa5基因型與抗病表型的相關(guān)性是保守的。 【生物學(xué)功能】白葉枯病菌在雜合和純合感病水稻上的生長(zhǎng)沒有顯著差別,一個(gè)Xa5 等位基因足以使抗病品種發(fā)病,增加一個(gè)拷貝并不能增加病斑的長(zhǎng)度。秈稻背景的抗病近等基因系比感病近等基因系的病原菌數(shù)目更多,但并沒表現(xiàn)出病斑,相反,粳稻背景的抗病和感病近等基因系的病原菌數(shù)目有很大差異,無論是秈稻和粳稻背景的抗病進(jìn)等基因系,病原菌的轉(zhuǎn)移都被延遲。這些結(jié)果表明xa5 介導(dǎo)的隱性抗病反應(yīng)抑制了病原菌的轉(zhuǎn)移而不是限制病原菌的增殖(Iyer-Pascuzzi et al., 2008)。 水稻黃單胞菌兩個(gè)致病變種白葉枯病菌和條斑病菌的轉(zhuǎn)錄激活因子樣效應(yīng)物(TALEs),能直接與TFIIAγ5相互作用,激活宿主即水稻的易感基因,TFIIAγ5表達(dá)下調(diào)或或突變使得轉(zhuǎn)基因水稻具有抗病性(Yuan et al. 2016)。 【相關(guān)登錄號(hào)】
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·ONTOLOGY及相關(guān)基因 | |
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表型特征 | 白葉枯病抗性(TO:0000175), 水稻細(xì)菌性條斑病抗性(TO:0000203) |
分子功能 | DNA轉(zhuǎn)錄因子活性(GO:0003700) |
生物進(jìn)程 | RNA聚合酶II啟動(dòng)子驅(qū)動(dòng)的轉(zhuǎn)錄起始(GO:0006367), 基因表達(dá)調(diào)控(GO:0010468), 抗細(xì)菌反應(yīng)調(diào)控(GO:1900424) |
細(xì)胞結(jié)構(gòu) | 轉(zhuǎn)錄因子TFIIA復(fù)合物(GO:0005672) |
形態(tài)構(gòu)造 | 維管葉(PO:0009025) |
·參考文獻(xiàn) |
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1. Meng Yuan;Yinggen Ke;Renyan Huang;Ling Ma;Zeyu Yang;Zhaohui Chu;Jinghua Xiao;Xianghua Li;Shiping Wang A host basal transcription factor is a key component for infection of rice by TALE-carrying bacteria eLife, 2016, 5: e19605 |
2. Xiaofang Xie;Zhiwei Chen;Jinliang Cao;Huazhong Guan;Degong Lin;Chunlan Li;Tao Lan;Yuanlin Duan;Damei Mao;Weiren Wu Toward the Positional Cloning of qBlsr5a, a QTL Underlying Resistance to Bacterial Leaf Streak, Using Overlapping Sub-CSSLs in Rice PLoS ONE, 2014, 9(4): e95751 |
3. KEYU GU;DONGSHENG TIAN;CHENGXIANG QIU;ZHONGCHAO YIN Transcription activator-like type III effector AvrXa27 depends on OsTFIIAγ5 for the activation of Xa27 transcription in rice that triggers disease resistance to Xanthomonas oryzae pv. oryzae Molecular Plant Pathology, 2009, 10(6): 829-835 |
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7. Anjali S. Iyer;Susan R. McCouch The Rice Bacterial Blight Resistance Gene xa5 Encodes a Novel Form of Disease Resistance Molecular Plant-Microbe Interactions, 2004, 17(12): 1348-1354 |
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14. V. Petpisit;Gurdev S. Khush;H. E. Kauffman Inheritance of Resistance to Bacterial Blight in Rice Crop Science, 1977, 17(4): 551-554 |
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