Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB) and Department of Plant Biotechnology and Genetics, Ghent University, Gent, Belgium.
Plant Signal Behav. 2010 Feb;5(2):205-7. doi: 10.4161/psb.5.2.11214. Epub 2010 Feb 15.
Plant trichome initiation is steered by diverse developmental and environmental cues, through molecular mechanisms that remain elusive in most plant species. Using a robust experimental method to investigate the molecular mechanisms by which phytohormones modulate leaf trichome formation, we verified the effect of jasmonates, cytokinins and gibberellins in Arabidopsis (). All three phytohormones promoted Arabidopsis trichome initiation, but caused divergent effects on trichome maturation and other leaf parameters. Molecular analysis indicated that the phytohormones mediated trichome initiation by the transcriptional regulation of the components of the TRANSPARENT TESTA GLABRA1 (TTG1) activator/inhibitor complex. In this addendum, we additionally studied the effects of jasmonates, cytokinins and gibberellins on leaf trichome formation in a representative set of plant species, spanning the angiosperm lineage and covering different trichome types. We found that the general ability of the three phytohormones to impinge on trichome initiation is conserved across angiosperms, but that within a particular plant species distinct regulatory networks might be activated to steer the formation of the various trichome types.
植物表皮毛的起始是由多种发育和环境线索通过分子机制来调控的，但在大多数植物物种中，这些分子机制仍不明确。我们使用一种稳健的实验方法来研究植物激素调节叶片表皮毛形成的分子机制，验证了茉莉酸、细胞分裂素和赤霉素在拟南芥（Arabidopsis）中的作用（）。这三种植物激素都促进了拟南芥表皮毛的起始，但对表皮毛的成熟和其他叶片参数有不同的影响。分子分析表明，植物激素通过调节 TRANSPARENT TESTA GLABRA1（TTG1）激活/抑制复合物的组成部分的转录调控来介导表皮毛的起始。在本增刊中，我们还研究了茉莉酸、细胞分裂素和赤霉素在一组有代表性的植物物种中对叶片表皮毛形成的影响，这些植物涵盖了被子植物谱系，并具有不同的表皮毛类型。我们发现，这三种植物激素普遍能够影响表皮毛的起始，这在被子植物中是保守的，但在特定的植物物种中，可能会激活不同的调控网络来引导各种表皮毛类型的形成。
