AINTEGUMENTA and the D-type cyclin CYCD3;1 regulate root secondary growth and respond to cytokinins.


Type
Article
Change log
Authors
Randall, Ricardo S 
Miyashima, Shunsuke 
Blomster, Tiina 
Zhang, Jing 
Elo, Annakaisa 
Abstract

Higher plant vasculature is characterized by two distinct developmental phases. Initially, a well-defined radial primary pattern is established. In eudicots, this is followed by secondary growth, which involves development of the cambium and is required for efficient water and nutrient transport and wood formation. Regulation of secondary growth involves several phytohormones, and cytokinins have been implicated as key players, particularly in the activation of cell proliferation, but the molecular mechanisms mediating this hormonal control remain unknown. Here we show that the genes encoding the transcription factor AINTEGUMENTA (ANT) and the D-type cyclin CYCD3;1 are expressed in the vascular cambium of Arabidopsis roots, respond to cytokinins and are both required for proper root secondary thickening. Cytokinin regulation of ANT and CYCD3 also occurs during secondary thickening of poplar stems, suggesting this represents a conserved regulatory mechanism.

Description
Keywords
AINTEGUMENTA, Cyclin D, Cytokinins, Root development, Secondary growth
Journal Title
Biol Open
Conference Name
Journal ISSN
2046-6390
2046-6390
Volume Title
4
Publisher
The Company of Biologists
Sponsorship
Biotechnology and Biological Sciences Research Council (BB/D011914/1)
Biotechnology and Biological Sciences Research Council (BB/E024858/1)