作物学报 ›› 2021, Vol. 47 ›› Issue (4): 761-769.doi: 10.3724/SP.J.1006.2021.01046
王小纯1,2(), 王露露1, 张志勇1, 秦步坛1, 于美琴2, 韦一昊1, 马新明1,*()
WANG Xiao-Chun1,2(), WANG Lu-Lu1, ZHANG Zhi-Yong1, QIN Bu-Tan1, YU Mei-Qin2, WEI Yi-Hao1, MA Xin-Ming1,*()
摘要:
谷氨酰胺合成酶是小麦氮同化关键酶, 分为胞液型和质体型(TaGS2)两类, 其中胞液型TaGS又分为TaGS1、TaGSr和TaGSe。为了研究异源六倍体小麦A、B、D染色体组TaGS同工酶表达差异及调控机制, 本项目利用三代测序技术测定了TaGS同工酶基因转录水平, 依据中国春基因组序列克隆了豫麦49的12个TaGS同工酶启动子, 并对其序列进行了分析。结果表明, TaGS1主要由6B染色体基因转录, TaGSe和TaGSr主要由4D染色体基因转录, TaGS2主要由2D染色体基因转录, 不同TaGS同工酶转录起始位点距起始密码子ATG的距离不同。启动子元件分析显示, 6B染色体上的TaGS1启动子有较多W-box、AC-I、ABRE、as-1和茉莉酸甲酯等响应元件, 4D染色体上的TaGSe启动子有较多胁迫响应转录因子(MYB、MBS、LTR等)结合元件和植物生长素响应元件, 4D染色体上的TaGSr启动子有较多WRE3等转录因子结合元件, 2D染色体上的TaGS2启动子有较多A-box、WRE3、ARE及AT富集区。不同TaGS同工酶启动子顺式元件种类、数目及排列顺序均不同, 为进一步研究GS同工酶调控机制奠定了基础。
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