The E3 Ubiquitin Ligase HAF1 Modulates Circadian Accumulation of EARLY FLOWERING3 to Control Heading Date in Rice under Long-Day Conditions

Zhu, Chunmei; Peng, Qiang; Fu, Debao; Zhuang, Dongxia; Yu, Yiming; Duan, Min; Xie, Weibo; Cai, Yaohui; Ouyang, Yidang; Lian, Xingming; Wu, Changyin

doi:10.1105/tpc.18.00653

Cited by 32 publications

(29 citation statements)

References 75 publications

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“…OsPRR73 directly or indirectly repressed its own expression, leading to arrhythmic expression patterns of OsPRR73 in OsPRR73OX under LD and SD conditions (Figure 3a). In addition, the expression of OsPRR73 was increased in the oself3 mutant compared with the wild type, while the transcript abundance of OsLHY was reduced (Yang et al, 2013; Zhao et al, 2012; Zhu et al, 2018). Thus, OsPRR73 forms transcriptional feedback loops with other rice clock‐related proteins, including OsLHY, with which it forms a morning loop.…”

Section: Discussionmentioning

confidence: 99%

“…PhyB physically interacts with ELF3 to provide direct light input to the clock in Arabidopsis (Kolmos et al, 2011; Liu, Covington, Fankhauser, Chory, & Wagner, 2001). OsELF3 promotes rice flowering and negatively regulates the transcript level of OsPRR73 under LD conditions (Yang et al, 2013; Zhu et al, 2018). Thus, OsPRR73 responds to light as a component of the clock to integrate light signalling into input pathways.…”

Section: Discussionmentioning

confidence: 99%

“…Osgi mutants exhibit late flowering under SD conditions, and OsGI confers robust diurnal rhythms in the field (Izawa et al, 2011). OsELF3 promotes flowering by repressing Ghd7 at the transcriptional regulation level and maintains circadian accumulation by interacting with HAF1 under LDs (Yang, Peng, Chen, Li, & Wu, 2013; Zhao et al, 2012; Zhu et al, 2018). Ghd7.1/OsPRR37 represses expression of Ehd1 and Hd3a under LDs (Koo, Yoo, Park, Kwon, & Lee, 2013; Liu et al, 2018; Yan et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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The transcriptional repressor OsPRR73 links circadian clock and photoperiod pathway to control heading date in rice

Liang

Zhang

Cheng

et al. 2021

Plant Cell & Environment

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The phase transition from vegetative to reproductive growth is triggered by internal and external signals that participate in circadian clock in plants. We identified a rice floral inhibitor OsPRR73 encoding a CONSTANS protein. Overexpression of OsPRR73 resulted in late heading under both long‐day (LD) and short‐day (SD) conditions. Knockout mutants led to early heading under LD conditions but no change under SD. OsPRR73 mRNA accumulated at noon and exhibited a robust oscillation under constant light (LL) and constant darkness (DD) conditions. OsPRR73 overexpression exerted negative feedback on endogenous OsPRR73 expression and altered diurnal expressions of key flowering genes and circadian clock genes. OsPRR73 bound to the promoters of the floral gene Ehd1 and the circadian gene OsLHY, and significantly suppressed their expression at dawn. In LL and DD, the oscillatory patterns of the circadian genes OsLHY, OsTOC1, OsGI and OsELF3 were varied in OsPRR73OX and osprr73 mutants. OsPRR73 expression was decreased in osphyb mutants, and overexpression of OsPRR73 complemented the early heading date phenotype of osphyb, indicating OsPRR73 works downstream of OsPhyB. Therefore, OsPRR73 is involved in a feedback loop of the rice clock and connects the photoperiod flowering pathway by binding to the Ehd1 promoter in rice.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The transcriptional repressor OsPRR73 links circadian clock and photoperiod pathway to control heading date in rice

Liang

Zhang

Cheng

et al. 2021

Plant Cell & Environment

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“…The recent finding that the variation of a single a.a. in an E3-ubiquitin ligase target protein may have contributed to the geographic variation in heading date among japonica rice accessions, i.e., differential rice adaptation to different environments, opens up new prospects for the search for natural variability either in E3-ubiquitin ligases or in the target proteins ( Zhu et al, 2018 ) in rice and other crops. In rice, although more than 3000 genomes are available ( Sun et al, 2016 ) and SNPs identified, the phenotypic characterization under stress is still very scarce.…”

Section: Discussionmentioning

confidence: 99%

Modulation of Abiotic Stress Responses in Rice by E3-Ubiquitin Ligases: A Promising Way to Develop Stress-Tolerant Crops

et al. 2021

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Plants are unable to physically escape environmental constraints and have, therefore, evolved a range of molecular and physiological mechanisms to maximize survival in an ever-changing environment. Among these, the post-translational modification of ubiquitination has emerged as an important mechanism to understand and improve the stress response. The ubiquitination of a given protein can change its abundance (through degradation), alter its localization, or even modulate its activity. Hence, ubiquitination increases the plasticity of the plant proteome in response to different environmental cues and can contribute to improve stress tolerance. Although ubiquitination is mediated by different enzymes, in this review, we focus on the importance of E3-ubiquitin ligases, which interact with the target proteins and are, therefore, highly associated with the mechanism specificity. We discuss their involvement in abiotic stress response and place them as putative candidates for ubiquitination-based development of stress-tolerant crops. This review covers recent developments in this field using rice as a reference for crops, highlighting the questions still unanswered.

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“…The haf1 hd1 double mutant flowers as late as hd1 plants only in SD conditions, suggesting that HAF1 is essential for regulating heading by modulation of the diurnal rhythm of Hd1 protein in SDs (Yang et al ., 2015). Additional research revealed that HAF1 also mediates ubiquitination and modulates the diurnal rhythm of OsELF3 (an orthologue of the Arabidopsis ELF3, also known as Hd17) under LDs (Zhu et al ., 2018).…”

Section: Transcriptional and Post‐transcriptional Regulation Of Key Hmentioning

confidence: 99%

Transcriptional and post‐transcriptional regulation of heading date in rice

et al. 2021

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Rice is a facultative short day (SD) plant. In addition to serving as a model plant for molecular genetic studies of monocots, rice is a staple crop for about half of the world's population. Heading date is a critical agronomic trait, and many genes controlling heading date have been cloned over the last 2 decades. The mechanism of flowering in rice from recognition of day length by leaves to floral activation in the shoot apical meristem has been extensively studied. In this review, we summarise current progress on transcriptional and post-transcriptional regulation of heading date in rice, with emphasis on post-translational modifications of key regulators, including Heading date 1 (Hd1), Early heading date 1 (Ehd1), Grain number, plant height, and heading date7 (Ghd7). The contribution of heading date genes to heterosis and the expansion of rice cultivation areas from low-latitude to high-latitude regions are also discussed. To overcome the limitations of diverse genetic backgrounds used in heading date studies and to gain a clearer understanding of flowering in rice, we propose a systematic collection of genetic resources in a common genetic background. Strategies in breeding adapted cultivars by rational design are also discussed.

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The E3 Ubiquitin Ligase HAF1 Modulates Circadian Accumulation of EARLY FLOWERING3 to Control Heading Date in Rice under Long-Day Conditions

Cited by 32 publications

References 75 publications

The transcriptional repressor OsPRR73 links circadian clock and photoperiod pathway to control heading date in rice

The transcriptional repressor OsPRR73 links circadian clock and photoperiod pathway to control heading date in rice

Modulation of Abiotic Stress Responses in Rice by E3-Ubiquitin Ligases: A Promising Way to Develop Stress-Tolerant Crops

Transcriptional and post‐transcriptional regulation of heading date in rice

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