·常規(guī)信息 最近更新:2022年9月13日 11:47:00 | |||||||||
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基因(座)名稱 | 稻瘟病抗性基因; 含有核苷酸結(jié)合結(jié)構(gòu)域和富含亮氨酸重復序列的蛋白; NLR類受體 Magnaporthe grisea resistance-9; nucleotide-binding leucine-rich repeat (NLR) receptor | ||||||||
基因符號 | Piz-t; Pi9; Pi2; Piz-5; Pi50; Piz; Pigm; Pizh | ||||||||
所在染色體 | 6 (已克。 | ||||||||
Pizh(MH807580, Xie et al. 2019)... Pi2, Pi9, Pi50, Pigm, Pizh, Piz, Piz-t 同為Piz位點上的復等位基因。其中,F(xiàn)ukunishiki 攜帶Pi2/Piz5,二八占攜帶Pi50,而Pi9來自小粒野生稻。 【定位與克隆】Amante-Bordeos等首先將源自小粒野生稻中的抗稻瘟病基因?qū)朐耘嗟局,并命名?em>Pi9。Pi9定位于6號染色體,與之緊密連鎖的RFLP標記有RG64和R2132。Pi2初步定位在水稻6號染色體上RG64和RZ612之間,遺傳距離分別是2.1 cM 和7.2 cM(Yu et al, 1991; Mew et al, 1994),后被精細定位在分子標記RG64和AP22之間,遺傳距離為0.9 cM和1.2 cM(吳金紅等, 2002)。 【抗譜表現(xiàn)】Pi9 抗譜相當廣,對來自13 個國家的43 個稻瘟病菌株均表現(xiàn)出很高的抗性(Liu et al, 2002);Pi2 抗譜也相當廣,對從中國收集的792 個稻瘟小種中的絕大部分表現(xiàn)抗性,只有7.55% 的小種能侵染攜帶Pi2 的親本C101A51(Chen et al, 2001),此外,C101A51對來自13 個國家的43 個稻瘟病菌株中的36 個表現(xiàn)抗性(Liu et al, 2002)。 【生物學功能】Pi9 區(qū)域含有6 個串聯(lián)排列的NBS-LRR 基因,其中Nbs2-Pi9 為Pi9。Pi9 屬于NBS-LRR 類基因,含有2 個內(nèi)含子,長度分別是5362bp 和128bp,Pi-9 cDNA 全長4009 bp,包含3099bp 的編碼區(qū)和910-bp 3' UTR。Pi-9 編碼一個由1032 氨基酸組成的蛋白產(chǎn)物,該產(chǎn)物羧基端含有富亮氨酸重復域(LRRs),由17 個不完整的LRR 重復組成;在氨基端含有NBS 域,NBS 域內(nèi)有激酶1a、2和激酶3a等結(jié)構(gòu)(Qu et al., 2006)。 Pi9 在抗病植株中組成性表達,表達不受稻瘟病侵染誘導。Pi9 至少對21 個稻瘟病菌小種具有抗性,是一個稻瘟病廣譜抗性基因。Pi9 對稻瘟病的廣譜抗病性的分子機制可能是Pi9 可以識別不同稻瘟病菌小種的保守分子,或者Pi9 可以識別不同稻瘟病菌小種的不同分子。 Pi2 屬于NBS-LRR類基因,含有2個內(nèi)含子,長度分別是3839bp 和116bp,Pi2 cDNA 全長3332 bp,包含117-bp 5' UTR 和116-bp 3' UTR。Pi2 編碼產(chǎn)物包含1032 個氨基酸,含有1 個核苷酸結(jié)合位點(NBS)和3 個富亮氨酸重復區(qū)(LRR);Pi2 與Pi-zt 的編碼產(chǎn)物僅在3個LRRs區(qū)域有8個氨基酸的差異;而在這8突變氨基酸中,僅有1個位于xxLxLxx基序中(Zhou et al., 2006)。 粳稻品種中花11的抗性位點Pizh,包含9個NLR基因,但僅Pizh-1和Pizh-2表達。遺傳互補實驗表明僅Pizh-1而非Pizh-2對稻瘟病菌有抗性。有趣的是,通過CRISPR-Cas9對Pizh-1和Pizh-2進行突變,均消除了Pizh介導的抗性,表明Pizh-1的抗性依賴于Pizh-2。Pizh-1和Pizh-2通過直接互作形成NLRs復合物,Pizh-1可能作為“執(zhí)行者”NLR,而Pizh-2作為“助手”NLR(Xie et al., 2019)。 秈稻地方品種谷梅4號中的Pigm位點是一個包含多個NBS-LRR類抗病基因的基因簇,其中只有PigmR和PigmS編碼具有功能的蛋白,PigmR在水稻的葉、莖稈、穗等器官組成性表達。PigmR能形成同源二聚體,發(fā)揮廣譜抗病功能,但PigmR導致水稻千粒重降低,產(chǎn)量下降。與PigmR相反,PigmS受表觀遺傳調(diào)控,僅在水稻的花粉中特異高表達,在葉片、莖稈等病原菌侵染的組織部位表達量很低,但可以提高水稻的結(jié)實率,抵消PigmR對產(chǎn)量的影響。PigmS可以與PigmR競爭形成異源二聚體抑制PigmR介導的廣譜抗病性。但由于PigmS低水平的表達,為病原菌提供了一個“避難所”,病原菌的進化選擇壓力變小,減緩了病原菌對PigmR的致病性進化,因此Pigm介導的抗病具有持久性(Deng et al. 2017)。 【相關登錄號】
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·ONTOLOGY及相關基因 | |
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表型特征 | 葉瘟抗性(TO:0000468) |
分子功能 | 蛋白同源二聚化活性(GO:0042803), 蛋白異源二聚化活性(GO:0046982), 信號受體活性(GO:0038023) |
生物進程 | 基因表達調(diào)控(GO:0010468), 抗真菌先天免疫反應調(diào)控(GO:1905034), NLR受體信號通路(GO:0035872), 效應子觸發(fā)的植物免疫反應(GO:0080185) |
·參考文獻 |
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