·常規(guī)信息 最近更新:2022年12月15日 10:18:00 | |||||||||
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基因(座)名稱 | 早穗基因; 生育期基因; 抽穗期基因; 早熟基因; B型響應調(diào)節(jié)因子 Early heading date 1; type-B response regulator | ||||||||
基因符號 | Ehd1 | ||||||||
所在染色體 | 10 (已克。 | ||||||||
Ehd1,源自非洲栽培稻(Oryza glaberrima Steud.)的早抽穗數(shù)量性狀基因(QTL),在沒有Hd1 的參與下,能獨自誘導水稻在短日照條件下提早抽穗。 【突變體表型】攜帶有功能正常的Ehd1 品種如非洲稻,日本晴和Kasalath,抽穗期早;而攜帶沒有功能的Ehd1 品種如臺中65 抽穗期遲。 【定位與克隆】Ehd1 初定位于水稻第10染色體上分子標記Xnbp37 附近(Doi et al., 1998),在其附近除發(fā)現(xiàn)有一個微效基因Hd14 外,沒有發(fā)現(xiàn)其他控制開花期的主效QTL 。 Ehd1編碼由341個氨基酸組成的B型反應調(diào)節(jié)子,調(diào)節(jié)子的N末端有一個接受域,中部有一個能與DNA結(jié)合的GARP域。對不同品種Ehd1 等位基因的序列分析表明,與日本晴、Kasalath等比較,T65的GARP域中發(fā)生一個由甘氨酸(Gly)到精氨酸(Arg)的置換,這直接導致了T65的遲開花(Doi et al. 2004)。 【生物學功能】Ehd1通過誘導FT-like基因的表達來促進短日照下提早抽穗。Edh1與水稻中未知的組蛋白激酶形成雙組分信號級聯(lián)傳遞通路,調(diào)控水稻的開花。 開花期基因?qū)χ参镏晷拖嚓P性狀有影響。Hd1 和Ehd 基因能夠降低穗部一次枝梗的數(shù)目,導致穗粒數(shù)的減少,并且這是獨立于對開花期的控制的。Hd1 Ehd1 株系在開花轉(zhuǎn)換時期的葉片中,Hd3a 和RFT1 這兩個成花素基因的表達上調(diào)。進一步的結(jié)果表明Hd1 和(或)Ehd1 導致穗發(fā)育時頂端分生組織中類Terminal Flower 1 基因上調(diào)、穗形成相關基因的表達提前。因此,Hd1 和Ehd1 這兩個重要的開花基因調(diào)控水稻穗發(fā)育,可能是通過影響葉片中成花素基因的表達進而影響作物的大田產(chǎn)量(Endo-Higashi et al. 2011)。 組成型開花抑制因子OsCOL4作用于Ehd1上游和OsphyB下游(Lee et al. 2010)。 Ehd1的同源二聚化參與誘導水稻開花,而A型響應調(diào)節(jié)子OsRR1通過與Ehd1結(jié)合形成無活性的復合物,抑制Ehd1活性(Cho et al. 2016)。 Hd3a、RFT1和Ehd1整合光周期和干旱脅迫信號,延緩水稻的成花轉(zhuǎn)變。干旱脅迫會顯著降低Ehd1、Hd3a和RFT1的轉(zhuǎn)錄(Galbiati et al. 2016)。 細胞分裂素處理能降低成花素基因Hd3a和RFT1的轉(zhuǎn)錄水平。研究發(fā)現(xiàn)細胞分裂素誘導了A型響應調(diào)節(jié)因子OsRR1和OsRR2的表達,它們能夠與Ehd1結(jié)合形成無活性的復合物,抑制Ehd1活性。而細胞分裂素并不影響ehd1敲除突變體的抽穗期。這些結(jié)果說明外源細胞分裂素通過抑制Ehd1來延緩水稻成花素基因的表達,從而增加營養(yǎng)生長期持續(xù)時間(Cho et al. 2022)。 【相關登錄號】
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·ONTOLOGY及相關基因 | |
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表型特征 | 抽穗期(TO:0000137), 光周期敏感性(TO:0000229), 生育期(TO:0000469) |
分子功能 | DNA轉(zhuǎn)錄因子活性(GO:0003700) |
生物進程 | 穗發(fā)育(GO:0010229), 缺水脅迫應答(GO:0009414), 光周期-開花調(diào)控(GO:2000028) |
·參考文獻 |
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