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

International Journal of Molecular Sciences

Liang Su²  Pei Hou¹  Meifang Song¹  Xu Zheng¹  Lin Guo¹  Yang Xiao³  Lei Yan¹  Wanchen Li²  Jianping Yang¹ 

[1] Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China; E-Mails:;Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China; E-Mail:;Graduate School, Chinese Academy of Agricultural Sciences, Beijing 100081, China; E-Mail:

关键词: antagonistic action;    Arabidopsis thaliana;    photomorphogenesis;    phytochrome A;    phytochrome B;    synergistic action;   

DOI  :  10.3390/ijms160612199

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.