Abscisic acid (ABA) action on plastid transcription in Arabidopsis

植物激素是植物生长发育的重要调节因子，参与植物对环境信号的反应。受体和成员的信号链已被确定是至关重要的激素作用。植物激素影响核基因组中数千个基因的活性。根据大量的数据，这是可利用的在细胞核基因的表达，特别是还包括基因编码的蛋白质定位到质体的变化，这是令人震惊的是，几乎一无所知的植物激素的作用质体/叶绿体基因的表达。这是所有更令人惊讶的能量代谢（光合作用，呼吸）的改变属于植物对生物和非生物胁迫的胁迫控制的反应，是与衰老相关的代谢变化的一部分。该项目将集中研究脱落酸（阿坝）对叶绿体基因表达的作用。阿坝是在质体中合成的，并被认为是一种参与逆行信号传递到细胞核的质体因子。本研究旨在鉴定ABA控制的叶绿体基因及其相关的顺式元件、转录因子和信号转导链的组成部分。

Plant hormones are essential regulators of growth and development and involved in the response of plants to environmental cues. Receptors and members of signalling chains have been identified that are crucial for hormone action. Plant hormones affect the activity of thousands of genes in the nuclear genome. In the light of the wealth of data that is available on hormone-induced changes in the expression of nuclear genes, notably also including genes encoding proteins that are localized to plastids, it is astounding that near to nothing is known about the action of phytohormones on the expression of plastid/chloroplast genes. This is all the more surprising as alterations in the energy metabolism (photosynthesis, respiration) belong to the hormone-controlled responses of the plant to biotic and abiotic stresses and are part of the metabolic changes associated with senescence. The project will focus on the action of abscisic acid (ABA) on chloroplast gene expression. ABA is synthesized in the plastids and discussed as a plastid factor involved in retrograde signalling to the nucleus. This study aims at the identification of ABA-controlled chloroplast genes and of involved ciselements, transcription factors and components of signal transduction chain(s).