Research article2015Peer reviewedOpen access
AINTEGUMENTA and the D-type cyclin CYCD3;1 regulate root secondary growth and respond to cytokinins
Randall, Ricardo S.; Miyashima, Shunsuke; Blomster, Tiina; Zhang, Jing; Elo, Annakaisa; Karlberg, Anna; Immanen, Juha; Nieminen, Kaisa; Lee, Ji-Young; Kakimoto, Tatsuo; Blajecka, Karolina; Melnyk, Charles W.; Alcasabas, Annette; Forzani, Celine; Matsumoto-Kitano, Miho; Maehoenen, Ari Pekka; Bhalerao, Rishikesh; Dewitte, Walter; Helariutta, Ykae; Murray, James A. H.
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.
Keywords
Cytokinins; Secondary growth; Cyclin D; AINTEGUMENTA; Root development
Published in
Biology Open
2015, Volume: 4, number: 10, pages: 1229-1236
Publisher: COMPANY OF BIOLOGISTS LTD
UKÄ Subject classification
Developmental Biology
Publication identifier
DOI: https://doi.org/10.1242/bio.013128
Permanent link to this page (URI)
https://res.slu.se/id/publ/84632