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BIN2/DWF12 Antagonistically Transduces Brassinosteroid and Auxin Signals in the Roots of Arabidopsis

Cited 19 time in Web of Science Cited 21 time in Scopus
Authors
Maharjan, Puna Maya; Schulz, Burkhard; Choe, Sunghwa
Issue Date
2011-04-01
Publisher
SPRINGER
Citation
JOURNAL OF PLANT BIOLOGY; Vol.54 2; 126-134
Keywords
BrassinosteroidsAuxinABABIN2DWF4Lateral rootDWF4 pro:GUS
Abstract
Plant growth-stimulating hormones brassinosteroids (BRs) function via interactions with other hormones. However, the mechanism of these interactions remains to be elucidated. The unique phenotypes of brassinosteroid insensitive2/dwarf12-D (bin2/dwf12-D) mutants, such as twisted inflorescences and leaves, suggested that BIN2, a negative regulator of BR signaling, may be involved in auxin signaling. Furthermore, previously, we showed that auxin stimulates DWF4 expression. To determine the possible role of BIN2/DWF12 in Auxin signaling, we measured DWARF4pro:GUS activity through both GUS histochemical staining and in vivo GUS assay. We found that the GUS activity in the bin2/dwarf12-1D background dramatically increased relative to control. In addition, the number of lateral roots (LR) in bin2/dwf12-1D was greater than wild type, and the optimal concentration for auxin-mediated lateral root induction was lower in bin2/dwf12-1D; these findings suggest that BIN2 plays a positive role in auxin signaling. In contrast, ABA repressed both DWF4pro:GUS expression and lateral root development. However, the degree of repression was lower in bin2/dwf12-1D background, suggesting that BIN2 plays a role in ABA-mediated DWF4pro:GUS expression and subsequently in lateral root development, too. Therefore, it is likely that BIN2 plays a role of signal integrator for multiple hormones, such as BRs, auxin, and ABA.
ISSN
1226-9239
Language
English
URI
http://hdl.handle.net/10371/75074
DOI
https://doi.org/10.1007/s12374-010-9138-3
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Architecture and Architectural Engineering (건축학과)Journal Papers (저널논문_건축학과)
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