Please use this identifier to cite or link to this item:
|Title:||Genetic and molecular regulation by DELLA proteins of trichome development in Arabidopsis|
|Source:||Gan, Y., Yu, H., Peng, J., Broun, P. (2007-11). Genetic and molecular regulation by DELLA proteins of trichome development in Arabidopsis. Plant Physiology 145 (3) : 1031-1042. ScholarBank@NUS Repository. https://doi.org/10.1104/pp.107.104794|
|Abstract:||Gibberellins (GA) are known to influence phase change in Arabidopsis (Arabidopsis thaliana) as well as the development of trichomes, which are faithful epidermal markers of shoot maturation. They modulate these developmental programs in part by antagonizing DELLA repressors of growth, GIBBERELLIC ACID INSENSITIVE (GAI) and REPRESSOR OF ga1-3 (RGA). In this study, we have probed the relative roles played by RGA, GAI, and two homologs, RGA-LIKE1 (RGL1) and RGL2, in these processes and investigated molecular mechanisms through which they influence epidermal differentiation. We found that the DELLAs act collectively to regulate trichome initiation on all aerial organs and that the onset of their activity is accompanied by the repression of most genes known to regulate trichome production. These effects are consistent with the results of genetic analysis, which conclusively place theses genes downstream of the DELLAs. We find that repression of trichome regulatory genes is rapid, but involves an indirect, rather than a direct, molecular mechanism, which requires de novo protein synthesis. DELLA activity also influences postinitiation events and we show that GAI is a major repressor of trichome branching, a role in which it is antagonized by RGL1 and RGL2. Finally, we report that, in contrast to most other effects, the repression by GA applications of flower trichome initiation is not dependent on RGA, GAI, RGL1, or RGL2. In summary, our data show that DELLA proteins are central to trichome development in Arabidopsis and that their effect can be largely explained by their transcriptional influence on trichome initiation activators. © 2007 American Society of Plant Biologists.|
|Source Title:||Plant Physiology|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jan 16, 2018
WEB OF SCIENCETM
checked on Jan 16, 2018
checked on Jan 12, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.