Surveying the future of mangroves
Mangroves form important but fragile coastline ecosystems in many tropical and warm temperate areas. Research programs must be shaped by their contribution to ecosystem services, their responses to extreme climatic events and their social-ecological significance.
PLANT PHYSIOLOGY:华中农大揭示ABA通过糖代谢调控植物耐受干旱胁迫的分子机制
β-Amylase (BAM)介导的对淀粉的降解可以协助植物应对干旱胁迫。本研究通过酵母单杂交的方法显示干旱胁迫诱导的来自枸桔的ABA信号途径中的两个转录因子PtrABF4 (P. trifoliata abscisic acid-responsive element-binding factor 4) and PtrABR1 (P. trifoliata ABA repressor 1)可以诱导表达PtrBAM3来提高植株对干旱胁迫的耐受性。其中 PtrABF4又可以结合到PtrABR1的启动子上来诱导它的表达，在蛋白水平上这两个转录因子可以形成蛋白复合物来共同诱导PtrBAM3的表达。
小结：本研究解释了在干旱胁迫条件下ABA信号途径转导组分调控淀粉降解的分子机制。
A model showing the co-action of ABA-responsive transcription factors in regulating starch degradation during drought stress. In trifoliate orange, drought-induced transcription factors ABF4 and ABR1 act together to activate the expression of the BAM3 gene. ABF4 transcriptionally activates ABR1 expression and physically interacts with ABR1, which leads to enhanced BAM3 expression. The β-amylase enzyme produced as a result of BAM3 expression catalyses the conversion of starch into soluble sugars in chloroplasts and subsequently promotes drought tolerance.
Abbreviations: ABA, abscisic acid; ABF4, ABRE-BINDING FACTOR 4; ABR1, ABA REPRESSOR1; BAM3, β-amylase 3.
原文信息：Transcription factors ABF4 and ABR1 synergistically regulate amylase-mediated starch catabolism in drought tolerance
