To grow or not to grow:: what can we learn on ethylene-gibberellin cross-talk by in silico gene expression analysis?
To grow or not to grow:: what can we learn on ethylene-gibberellin cross-talk by in silico gene expression analysis?
复制标题
DOI：
10.1093/jxb/erm349
复制
发表时间：
2008-01-01
影响因子：
6.9
通讯作者：
Van Der Straeten, Dominique
中科院分区：
文献类型：
--
作者：
Dugardeyn, Jasper;Vandenbussche, Filip;Van Der Straeten, Dominique
已知乙烯和赤霉素（GAs）通过相互串扰和通过与其它激素的相互作用来影响植物生长。转录本荟萃分析表明，GA和乙烯代谢基因在大多数植物器官中表达。因此，GA和乙烯前体1-氨基-环丙烷-1-羧酸（ACC）都可以普遍合成。这两种激素的运输已被描述，因此可能导致受控分布。转录本荟萃分析还表明，施加外源乙烯植物抑制GA代谢基因的表达。相反，在用GA处理后，一些乙烯合成基因的表达上调。分析进一步表明，编码这些激素的信号成分的基因在整个植物中表达。然而，拟南芥根中乙烯合成和信号传导基因的组织特异性转录物荟萃分析表明，乙烯在快速伸长和专业化区的功能更本地化，而GA似乎在分生区和过渡区发挥作用。最近的研究表明，油菜素类固醇和生长素在表皮发挥作用，从而驱动器官生长。从拟南芥根的转录元分析数据，它似乎也可以在一个细胞类型特异性的方式发挥作用。
Ethylene and gibberellins (GAs) are known to influence plant growth by mutual cross-talk and by interaction with other hormones. Transcript meta-analysis shows that GA and ethylene metabolism genes are expressed in the majority of plant organs. Both GAs and the ethylene precursor 1-amino-cyclopropane-1-carboxylic acid (ACC) may thus be synthesized ubiquitously. Transport of both hormones has been described and might hence lead to a controlled distribution. Transcript meta-analysis also suggests that applying exogenous ethylene to plants represses the expression of GA metabolism genes. Conversely, upon treatment with GAs, the expression of some ethylene synthesis genes is up-regulated. The analysis further shows that the genes coding for signalling components of these hormones are expressed throughout the entire plant. However, a tissue-specific transcript meta-analysis of ethylene synthesis and signalling genes in Arabidopsis roots suggests a more localized function of ethylene in the fast elongation and specialization zone, while GA seems to act in the (pro)meristematic zone and in the transition zone. Recent research has shown that brassinosteroids and auxins exert their function at the epidermis, consequently driving organ growth. From transcript meta-analysis data of Arabidopsis roots, it appears that GAs might also act in a cell type-specific manner.