种子萌发及其调控的研究进展

徐恒恒¹, 黎妮², 刘树君¹, 王伟青¹, 王伟平², 张红¹, 程红焱¹, 宋松泉^1,^*

Research Progress in Seed Germination and Its Control

XU Heng-Heng¹, LI Ni², LIU Shu-Jun¹, WANG Wei-Qing¹, WANG Wei-Ping², ZHANG Hong¹, CHENG Hong-Yan¹, SONG Song-Quan^1,^*

图3 ABA信号途径 A: 由PYRPYLRCAR蛋白家族介导的ABA信号途径。左边, 没有ABA: SnRK2激酶被蛋白磷酸酶2C PP2C失活, 因此, 包括ABI5的下游靶子被失活。右边, ABA的结合改变了PYRPYLRCAR的构型, 抑制了PP2C 的活性。去阻遏的SnRK2激酶活化下游的靶子。B: 种子中ABA介导的转录作用的组分。ABI5是bZIP转录因子的一个成员, 能与含有ABA反应元件ABRE的ACGT核心结合。ABI3和ABI4分别与RYSph元件和偶联元件1 CE1结合。RYSph和CE1是协同促进ABRE介导的转录的顺式元件。ABI3和ABI5相互作用, 但ABI4和ABI5不相互作用。引自Nambara等 [ 60 ] 。
Fig. 3 The pathway for ABA signalling A: The pathway for ABA signalling mediated by the PYRPYLRCAR family of proteins. Left, no ABA: SnRK2 kinase is inactivated by protein phosphatase 2C PP2C, and thus the downstream targets, including ABI5, are inactive. Right, ABA-binding alters the conformation of PYRPYLRCAR and inhibits the activity of PP2C. De-repressed SnRK2 kinase activates the downstream targets. B: The components of ABA-mediated transcription in seeds. ABI5 is a member of the bZIP transcription factors that bind to the ACGT-core containing the ABA responsive element ABRE. ABI3 and ABI4 bind to the RYSph element and coupling element 1 CE1, respectively. RYSph and CE1 are cis elements that synergistically enhance ABRE-mediated transcription. ABI3 and ABI5 interact with each other, but ABI4 and ABI5 do not. From Nambara et al. [ 60 ]