B‐box proteins: Pivotal players in light‐mediated development in plants

Song, Zhaoqing; Bian, Yeting; Liu, Jiujie; Sun, Yuting; Xu, Dongqing

doi:10.1111/jipb.12935

Cited by 100 publications

(94 citation statements)

References 95 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Upon light exposure, seedlings then switch to the light-mediated developmental program known as photomorphogenesis. These two distinct developmental processes enable the proper and healthy development of a young seedling (Jiao et al, 2007;Song et al, 2020). During the transition from the dark-to the light-driven developmental process, the expression of approximately onethird of genes throughout the Arabidopsis (Arabidopsis thaliana) genome is significantly altered, indicating that light orchestrates massive transcriptomic reprogramming in plants (Ma et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…This binding leads to the activation of BBX22 but repression of BBX30 and BBX31 by HY5 at the transcriptional level (Chang et al ., 2008; Yadav et al ., 2019; Heng et al ., 2019a). Thus, a set of BBXs together with HY5 form a sophisticated transcriptional regulatory network that precisely controls light‐mediated transcriptomic alterations and seedling development in response to dynamically changing light conditions (Vaishak et al ., 2019; Xu, 2019; Song et al ., 2020).…”

Section: Introductionmentioning

confidence: 99%

BBX28/BBX29, HY5 and BBX30/31 form a feedback loop to fine‐tune photomorphogenic development

et al. 2020

Self Cite

View full text Add to dashboard Cite

Light is one of the key environmental cues controlling photomorphogenic development in plants. A group of B-box (BBX) proteins play critical roles in this developmental process through diverse regulatory mechanisms. In this study we report that BBX29 acts as a negative regulator of light signaling. BBX29 interacts with CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) and undergoes COP1-mediated degradation in the dark. Mutant seedlings with loss of BBX29 function show shortened hypocotyls, while transgenic plants overexpressing BBX29 display elongated hypocotyls in the light. Both BBX28 and BBX29 interfere with the binding of ELONGATED HYPOCOTYL 5 (HY5) to the promoters of BBX30 and BBX31, consequently leading to the upregulation of their transcript levels. BBX30 and BBX31 associate with the promoter regions of BBX28 and BBX29, which in turn promotes the expression of these genes. Taken together, this study reveals a transcriptional feedback loop consisting of BBX28, BBX29, BBX30, BBX31, and HY5 that serves to fine-tune photomorphogenesis in response to light in plants.

show abstract

“…B-box transcription factors are a class of zinc finger binding proteins, which contain one or two B-box domains in the N-terminus and sometimes a CCT (CONTANS, CO-like and TOC1) domain in the C-terminus 27 , 28 . Based on the numbers of B-box domains and the existence of CCT domain, the 32 B-box proteins in Arabidopsis are classified into five groups.…”

Section: Introductionmentioning

confidence: 99%

B-box transcription factor 28 regulates flowering by interacting with constans

Liu

Lin

Yin

et al. 2020

Sci Rep

View full text Add to dashboard Cite

B-box transcription factors (BBXs) are important regulators of flowering, photomorphogenesis, shade-avoidance, abiotic and biotic stresses and plant hormonal pathways. In Arabidopsis, 32 BBX proteins have been identified and classified into five groups based on their structural domains. Little is known about the fifth group members (BBX26–BBX32) and the detailed molecular mechanisms relevant to their functions. Here we identified B-box transcription factor 28 (BBX28) that interacts with Constans (CO), a transcriptional activator of Flowering Locus T (FT). Overexpressing BBX28 leads to late flowering with dramatically decreased FT transcription, and bbx28 deficient mutant displays a weak early flowering phenotype under long days (LD), indicating that BBX28 plays a negative and redundant role in flowering under LD. Additionally, the interaction between BBX28 and CO decreases the recruitment of CO to FT locus without affecting the transcriptional activation activity of CO. Moreover, the N-terminal cysteines, especially those within the B-box domain, are indispensable for the heterodimerization between BBX28 and CO and activation of CO on FT transcription. Genetic evidences show that the later flowering caused by BBX28 overexpression is compromised by CO ectopic expression. Collectively, these results supported that BBX28 functions with CO and FT to negatively regulate Arabidopsis flowering, in which the N-terminal conserved cysteines of BBX28 might play a central role.

show abstract

B‐box proteins: Pivotal players in light‐mediated development in plants

Cited by 100 publications

References 95 publications

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

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

BBX28/BBX29, HY5 and BBX30/31 form a feedback loop to fine‐tune photomorphogenic development

B-box transcription factor 28 regulates flowering by interacting with constans

Contact Info

Product

Resources

About