期刊
PLANT AND CELL PHYSIOLOGY
卷 53, 期 2, 页码 457-469出版社
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcr192
关键词
Branching; Cell differentiation; Gibberellic acid signaling; GIS; Trichome
资金
- National Natural Science Foundation of China [30970167, 31000093]
- Transgenic Plant Breeding Program of China [[2009ZX08005]015B]
- Ministry of Education of China [PhD Programs Foundation] [20090101110097]
- Scientific Research Foundation for Returned Scholars [20101174]
- Zhejiang Province of China [Scientific Research Foundation for Returned Scholars] [20100129]
Cell differentiation generally corresponds to the cell cycle, typically forming a non-dividing cell with a unique differentiated morphology, and Arabidopsis trichome is an excellent model system to study all aspects of cell differentiation. Although gibberellic acid is reported to be involved in trichome branching in Arabidopsis, the mechanism for such signaling is unclear. Here, we demonstrated that GLABROUS INFLORESCENCE STEMS (GIS) is required for the control of trichome branching through gibberellic acid signaling. The phenotypes of a loss-of-function gis mutant and an overexpressor showed that GIS acted as a repressor to control trichome branching. Our results also show that GIS is not required for cell endoreduplication, and our molecular and genetic study results have shown that GIS functions downstream of the key regulator of trichome branching, STICHEL (STI), to control trichome branching through the endoreduplication-independent pathway. Furthermore, our results also suggest that GIS controls trichome branching in Arabidopsis through two different pathways and acts either upstream or downstream of the negative regulator of gibbellic acid signaling SPINDLY (SPY).
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