MYB30 Is a Key Negative Regulator of Arabidopsis Photomorphogenic Development That Promotes PIF4 and PIF5 Protein Accumulation in the Light

Yan, Yan; Cong, Li; Dong, Xiaojing; Li, Hong; Zhang, Dun; Zhou, Yalin; Jiang, Bochen; Peng, Jing; Qin, Xinyan; Cheng, Jinkui; Wang, Xiaoji; Song, Pengyu; Qi, Lijuan; Zheng, Yuan; Li, Bosheng; Terzaghi, William; Yang, Shuhua; Guo, Yan; Li, Jigang

doi:10.1105/tpc.19.00645

Cited by 80 publications

(72 citation statements)

References 99 publications

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“…Nevertheless, the question of whether MYB30 is a negative regulator of the ROS wave remains to be answered. A recent study found that MYB30 interacts with phytochrome-interacting factor4 (PIF4) to regulate light responses in Arabidopsis (Yan et al, 2020). Interestingly, PIF4 was found by our analysis to be a MYB30-dependent light stress response systemic transcript (Supplemental Table S1), suggesting that MYB30 could, at least partially, regulate systemic light responses via PIF4 (Fig.…”

Section: Discussionmentioning

confidence: 62%

MYB30 Orchestrates Systemic Reactive Oxygen Signaling and Plant Acclimation

et al. 2020

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Systemic acquired acclimation (SAA) is a key biological process essential for plant survival under conditions of abiotic stress. SAA was recently shown to be controlled by a rapid systemic signaling mechanism termed the reactive oxygen species (ROS) wave in Arabidopsis (Arabidopsis thaliana). MYB30 is a key transcriptional regulator mediating many different biological processes. MYB30 was found to act downstream of the ROS wave in systemic tissues of Arabidopsis in response to local high light (HL) stress treatment. However, the function of MYB30 in systemic signaling and SAA is unknown. To determine the relationship among MYB30, the ROS wave, and systemic acclimation in Arabidopsis, the SAA response to HL stress of myb30 mutants and wild-type plants was determined. Although myb30 plants were found to display enhanced rates of ROS wave propagation and their local tissues acclimated to the HL stress, they were deficient in SAA to HL stress. Compared to wild type, the systemic transcriptomic response of myb30 plants was also deficient, lacking in the expression of over 3,500 transcripts. A putative set of 150 core transcripts directly associated with MYB30 function during HL stress was determined. Our study identifies MYB30 as a key regulator that links systemic ROS signaling with systemic transcriptomic responses, SAA, and plant acclimation to HL stress. In addition, it demonstrates that plant acclimation and systemic ROS signaling are interlinked and that the lack of systemic acclimation drives systemic ROS signaling to occur at faster rates, suggesting a feedback mechanism (potentially involving MYB30) between these two processes.

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Section: Discussionmentioning

confidence: 62%

MYB30 Orchestrates Systemic Reactive Oxygen Signaling and Plant Acclimation

et al. 2020

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“…DELLA, HY5, and freezing tolerance related APETALA2 (AP2) family transcription factor C-repeat binding factor (CBF) [ 42 – 44 ]. Second, a few reports have been shown that PIF4 and PIF5 proteins accumulated to higher levels in light than in dark though PIF3 accumulated to the highest level in dark [ 45 , 46 ]. Here, we provide evidence that PIF proteins also act as direct positive regulators in plant defense against whitefly vector ( Fig 4 ).…”

Section: Discussionmentioning

confidence: 99%

Red-light is an environmental effector for mutualism between begomovirus and its vector whitefly

et al. 2021

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Environments such as light condition influence the spread of infectious diseases by affecting insect vector behavior. However, whether and how light affects the host defense which further affects insect preference and performance, remains unclear, nor has been demonstrated how pathogens co-adapt light condition to facilitate vector transmission. We previously showed that begomoviral βC1 inhibits MYC2-mediated jasmonate signaling to establish plant-dependent mutualism with its insect vector. Here we show red-light as an environmental catalyzer to promote mutualism of whitefly-begomovirus by stabilizing βC1, which interacts with PHYTOCHROME-INTERACTING FACTORS (PIFs) transcription factors. PIFs positively control plant defenses against whitefly by directly binding to the promoter of terpene synthase genes and promoting their transcription. Moreover, PIFs interact with MYC2 to integrate light and jasmonate signaling and regulate the transcription of terpene synthase genes. However, begomovirus encoded βC1 inhibits PIFs’ and MYC2’ transcriptional activity via disturbing their dimerization, thereby impairing plant defenses against whitefly-transmitted begomoviruses. Our results thus describe how a viral pathogen hijacks host external and internal signaling to enhance the mutualistic relationship with its insect vector.

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“…PIF4 promotes hypocotyl elongation mainly by regulating downstream auxin signaling, which promotes cell elongation (Sun et al, 2013). In addition to the circadian clock, multiple signaling cascades (phytochromes, cryptochromes, UV-B, low and high ambient temperature) converge on PIF4 and the PIF4-mediated auxin signal transduction pathway to control hypocotyl growth (Huq and Quail, 2002;Jung et al, 2016;Legris et al, 2016;Ma et al, 2016;Pedmale et al, 2016;Hayes et al, 2017;Dong et al, 2020;Jiang et al, 2020;Yan et al, 2020). Thus, PIF4 functions as a central hub, acting downstream of multiple signaling pathways, to gate seedling growth.…”

Section: Introductionmentioning

confidence: 99%

COLD-REGULATED GENE27 Integrates Signals from Light and the Circadian Clock to Promote Hypocotyl Growth in Arabidopsis

et al. 2020

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Light and the circadian clock are two essential external and internal cues affecting seedling development. COLD-REGULATED GENE27 (COR27), which is regulated by cold temperatures and light signals, functions as a key regulator of the circadian clock. Here, we report that COR27 acts as a negative regulator of light signaling. COR27 physically interacts with the CONSTITUTIVELY PHOTOMORPHOGENIC1 (COP1)-SUPPRESSOR OF PHYTOCHROME A1 (SPA1) E3 ubiquitin ligase complex and undergoes COP1-mediated degradation via the 26S proteasome system in the dark. cor27 mutant seedlings exhibit shorter hypocotyls, while transgenic lines overexpressing COR27 show elongated hypocotyls in the light. In addition, light induces the accumulation of COR27. On one hand, accumulated COR27 interacts with ELONGATED HYPOCOTYL5 (HY5) to repress HY5 DNA binding activity. On the other hand, COR27 associates with the chromatin at the PHYTOCHROME INTERACTING FACTOR4 (PIF4) promoter region and upregulates PIF4 expression in a circadian clock-dependent manner. Together, our findings reveal a mechanistic framework whereby COR27 represses photomorphogenesis in the light and provide insights toward how light and the circadian clock synergistically control hypocotyl growth.

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MYB30 Is a Key Negative Regulator of Arabidopsis Photomorphogenic Development That Promotes PIF4 and PIF5 Protein Accumulation in the Light

Cited by 80 publications

References 99 publications

MYB30 Orchestrates Systemic Reactive Oxygen Signaling and Plant Acclimation

MYB30 Orchestrates Systemic Reactive Oxygen Signaling and Plant Acclimation

Red-light is an environmental effector for mutualism between begomovirus and its vector whitefly

COLD-REGULATED GENE27 Integrates Signals from Light and the Circadian Clock to Promote Hypocotyl Growth in Arabidopsis

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