Role of PIN-mediated auxin efflux in apical hook development of Arabidopsis thaliana
| Authors | |
|---|---|
| Year of publication | 2010 |
| Type | Article in Periodical |
| Magazine / Source | Development |
| MU Faculty or unit | |
| Citation | |
| Web | http://apps.isiknowledge.com/full_record.do?product=UA&search_mode=GeneralSearch&qid=506&SID=N1GpfJdJ64p57Eeheen&page=1&doc=2&colname=WOS |
| Field | Genetics and molecular biology |
| Keywords | PIN3 Apical hook Auxin Arabidopsis |
| Description | The apical hook is a simple structure that develops to protect the meristem during emergence and that opens upon exposure to light. Differential growth at the apical hook proceeds in three sequential steps that are regulated by multiple hormones, principally auxin and ethylene. We show that the progress of the apical hook depends on the dynamic, asymmetric distribution of auxin, which is regulated by auxin efflux carriers of the PIN family. Several PIN proteins exhibited specific and temporal expression patterns, and their subcellular localization suggested auxin fluxes during hook development. Genetic manipulation of individual PIN activities interfered with different stages of hook development, implying that specific combinations of PIN genes are required for progress of the apical hook through the development. Furthermore, ethylene might modulate the formation and the maintenance phase. This ethylene effect is in part mediated by regulation of PIN-dependent auxin efflux and auxin signaling. |
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