Chin Bull Bot ›› 2019, Vol. 54 ›› Issue (1): 9-22.doi: 10.11983/CBB18147

• INVITED REVIEW • Previous Articles     Next Articles

Advances in Photoreceptor-mediated Signaling Transduction in Flowering Time Regulation

Ma Chaofeng(),Dai Silan()   

  1. College of Landscape Architecture, Beijing Forestry University, Beijing 100083, China
  • Received:2018-06-25 Accepted:2018-09-17 Online:2019-07-31 Published:2019-01-01
  • Contact: Ma Chaofeng,Dai Silan E-mail:silandai@sina.com

Abstract:

Light is an important environmental factor that affects plant growth and development. Flowering is the most important event in higher plants. Plants perceive accurately changes in the surrounding light environments by photoreceptors, thus activating a series of signaling transduction processes and initiating flowering. Here, we summarized the current understanding of the structural characteristics and physiological functions of various photoreceptors in higher plants. We reviewed the molecular mechanisms of phytochromes, cryptochromes, and FKF1/ZTL/LKP2 in mediating signaling transduction and flowering time, including transcriptional and post-transcriptional regulation of CO and FT. Finally, we described the advances in photoreceptor-mediated-integration of light, temperature, and gibberellin signals in regulating flowering. Future directions in this area were also proposed.

Key words: photoreceptor, flowering, phytochrome, cryptochrome

Figure 1

Schematic structural diagrams of plant photoreceptors The N-terminus of phytochromes is a photosensory region (containing PAS, GAF, and PHY), which covalently binds chromophores. The C-terminal light regulatory domains, including PAS and HKRD, are involved in phytochrome dimer formation and downstream signaling transduction. The N-terminus of cryptochromes is a PHR domain, which non-covalently binds FAD and MTHF, and the C-terminal CCE domain is important for protein-protein interactions and signaling transduction. The two N-terminal LOV domains (LOV1 and LOV2) of phototropins bind FMN to perceive light signals and are required for interaction with other proteins. ZTL proteins contain three important functional conserved domains: the N-terminal LOV domain, the intermediate F-box motif, and the C-terminal Kelch repeat region. The LOV domain binds to FMN, and the Kelch domain mediates protein-protein interactions."

Table 1

Photoreceptors and their physiological functions in Arabidopsis thaliana"

光受体 基因 生理功能 主要参考文献
光敏色素
PHYA 促进开花, 幼苗去黄化, 种子萌发, 避阴反应 Johnson et al., 1994; Sch?fer and Bowler, 2002; Tepperman et al., 2006; Heschel et al., 2007
PHYB 抑制开花, 幼苗去黄化, 种子萌发, 气孔发育,
避阴反应
Guo et al., 1998; Sch?fer and Bowler, 2002; Heschel et al., 2007; Wang et al., 2010; Kami et al., 2010
PHYC 短日照下抑制开花, 长日照下促进开花 Monte et al., 2003
PHYD 抑制开花, 种子萌发, 避阴反应 Devlin and Kay, 2000; Sch?fer and Bowler, 2002; Heschel et al., 2007
PHYE 抑制开花, 种子萌发, 避阴反应 Devlin and Kay, 2000; Sch?fer and Bowler, 2002; Heschel et al., 2007
隐花色素
CRY1 促进开花, 气孔发育, 幼苗去黄化 Ahmad and Cashmore, 1993; Mao et al., 2005
CRY2 促进开花, 幼苗去黄化, 昼夜节律调控 Koornneef et al., 1991; Guo et al., 1998
向光素
PHOT1 向光性, 光诱导的气孔开放和叶绿体运动,
抑制下胚轴伸长
Briggs and Christie, 2002; Celaya and Liscum, 2005
PHOT2 向光性, 光诱导的气孔开放和叶绿体运动,
抑制下胚轴伸长
Briggs and Christie, 2002; Celaya and Liscum, 2005
ZTLs FKF1 促进开花, 昼夜节律信号输入 Imaizumi et al., 2005; Baudry et al., 2010
ZTL 长日照下抑制开花, 昼夜节律信号输入 Somers et al., 2000; Baudry et al., 2010
LKP2 抑制开花 Takase et al., 2011
紫外受体
UVR8 抑制下胚轴伸长, 光形态建成, 抑制开花 Favory et al., 2009; Gruber et al., 2010; Yang et al., 2018; Liang et al., 2018

Figure 2

A schematic diagram of flowering time regulation by photoreceptor-mediated environmental signaling in Arabidopsis Six flowering regulatory pathways have been identified in plants, including photoperiodic pathway, vernalization pathway, temperature pathway, autonomous pathway, gibberellin pathway, and age pathway. Phytochromes, cryptochromes, and ZTL/FKF1/ LKP2 perceive light signals in leaves, and transmit the signals to the circadian clock. After signaling integration through multiple flowering pathways, the photoreceptors eventually directly or indirectly regulate CO, FT and FLC expression and protein stability. In the ambient temperature pathway, the phytochromes indirectly regulate the transcription of FT by FLM, SVP and PIF4 through FCA/FVE. SRR1 integrates signals from the gibberellin pathway and vernalization pathway and regulate FT transcription through GA3OX1/2 and DELLA proteins in the GA pathway. In the vernalization pathway, VOZ1/2 and phytochromes regulates FT expression through FLC, SVP, and TEM1/2. The autonomous pathway promotes flowering by repressing FLC. Photoreceptors play an important role in the photoperiodic pathway. GI, CDF1, DNF, FBH1-4, COP1, SPA1, HOS1, and NF-Ys directly or indirectly interact with photoreceptors to regulate CO transcription, CO stability, and FT transcription. The age pathway regulates FT expression through miR156/172 and SPLs. There are signal integration mechanisms between different flowering pathways. The signals are integrated into FT, SOC1, and LFY, leading to the activation of AP1 and LFY and eventually the initiation of flowering. Solid arrows indicate direct promotion; dotted arrows indicate indirect promotion; blunted lines indicate direct inhibition; red ovals indicate red/far-red light photoreceptors; blue ovals indicate blue light photoreceptors, and gray ovals indicates signaling intermediate proteins."

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