Rook Fred, Hadingham Sophie A, Li Yunhai, Bevan Michael W
Department of Cell and Developmental Biology, John Innes Centre, Colney Lane, Norwich NR4 7UH, UK.
Plant Cell Environ. 2006 Mar;29(3):426-34. doi: 10.1111/j.1365-3040.2005.01477.x.
Sugars are essential to plant growth and metabolism, both as energy source and as structural components. Sugar production and use are in part controlled at the level of gene expression by the sugars themselves. Responses to sugar are closely integrated with response pathways that indicate environmental conditions such as light and water availability. High sugar levels inhibit seedling development, repress photosynthetic gene expression and induce genes of storage metabolism such as those of starch biosynthesis. Genetic approaches have demonstrated the importance of abscisic acid (ABA) and the transcriptional regulator ABA-insensitive4 (ABI4) in sugar response pathways. Recent analysis of both photosynthetic and starch biosynthetic gene promoters suggest a direct role for ABI4 in their control. The increased understanding of the regulatory promoter elements controlling gene expression, in response to sugar and ABA, allows transcriptional networks to be understood at a molecular level.
糖类对于植物生长和新陈代谢至关重要，既作为能量来源，也作为结构成分。糖的产生和利用部分受到糖类自身在基因表达水平上的调控。对糖的响应与指示光照和水分可利用性等环境条件的响应途径紧密整合。高糖水平会抑制幼苗发育、抑制光合基因表达并诱导储存代谢相关基因，如淀粉生物合成相关基因的表达。遗传学方法已证明脱落酸（ABA）和转录调节因子ABA不敏感4（ABI4）在糖响应途径中的重要性。最近对光合基因和淀粉生物合成基因启动子的分析表明，ABI4在它们的调控中起直接作用。对响应糖和ABA控制基因表达的调控启动子元件的深入了解，使得转录网络在分子水平上得以理解。
