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Int. J. Mol. Sci. 2015, 16(6), 12199-12212; doi:10.3390/ijms160612199

Synergistic and Antagonistic Action of Phytochrome (Phy) A and PhyB during Seedling De-Etiolation in Arabidopsis thaliana

1
Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China
2
Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
3
Beijing Radiation Center, Beijing 100875, China
4
Graduate School, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Current affiliation: Whitehead Institute for Biomedical Research, Nine Cambridge Center, Cambridge, MA 02142, USA.
*
Author to whom correspondence should be addressed.
Academic Editor: Marcello Iriti
Received: 16 March 2015 / Revised: 13 May 2015 / Accepted: 15 May 2015 / Published: 28 May 2015
(This article belongs to the Special Issue Plant Molecular Biology)
View Full-Text   |   Download PDF [1721 KB, uploaded 28 May 2015]   |  

Abstract

It has been reported that Arabidopsis phytochrome (phy) A and phyB are crucial photoreceptors that display synergistic and antagonistic action during seedling de-etiolation in multiple light signaling pathways. However, the functional relationship between phyA and phyB is not fully understood under different kinds of light and in response to different intensities of such light. In this work, we compared hypocotyl elongation of the phyA-211 phyB-9 double mutant with the wild type, the phyA-211 and phyB-9 single mutants under different intensities of far-red (FR), red (R), blue (B) and white (W) light. We confirmed that phyA and phyB synergistically promote seedling de-etiolation in B-, B plus R-, W- and high R-light conditions. The correlation of endogenous ELONGATED HYPOCOTYL 5 (HY5) protein levels with the trend of hypocotyl elongation of all lines indicate that both phyA and phyB promote seedling photomorphogenesis in a synergistic manner in high-irradiance white light. Gene expression analyses of RBCS members and HY5 suggest that phyB and phyA act antagonistically on seedling development under FR light. View Full-Text
Keywords: antagonistic action; Arabidopsis thaliana; photomorphogenesis; phytochrome A; phytochrome B; synergistic action antagonistic action; Arabidopsis thaliana; photomorphogenesis; phytochrome A; phytochrome B; synergistic action
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Su, L.; Hou, P.; Song, M.; Zheng, X.; Guo, L.; Xiao, Y.; Yan, L.; Li, W.; Yang, J. Synergistic and Antagonistic Action of Phytochrome (Phy) A and PhyB during Seedling De-Etiolation in Arabidopsis thaliana. Int. J. Mol. Sci. 2015, 16, 12199-12212.

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