A Positive Feedback Loop of BBX11–BBX21–HY5 Promotes Photomorphogenic Development in Arabidopsis

Zhao, Xiaoling; Heng, Yueqin; Wang, Xuncheng; Deng, Xing Wang; Xu, Dongqing

doi:10.1016/j.xplc.2020.100045

Cited by 50 publications

(47 citation statements)

References 55 publications

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“…The converse pattern in mRNA and protein level suggested the complex regulatory roles of these BBXs in photomorphogenesis. On the contrary, BBX11 accumulated both in transcript level and protein level when dark-grown seedlings transferred to light for 24 h [58]. In addition, BBX22 and BBX25 accumulated at transcriptional level when treated with light conditions for 10 h [59].…”

Section: Discussionmentioning

confidence: 92%

“…6). Photoreceptors PHYA, PHYB, CRY1, and CRY2 promoted BBX11 transcripts expression under light [58]. Therefore, PHYA, PHYB, CRY1 and CRY2 may play important roles in regulating BBXs transcriptional level.…”

Section: Discussionmentioning

confidence: 93%

“…Recently, many studies revealed the importance of BBXs in photomorphogenesis in Arabidopsis (Xu et al, 2016b;Zhang et al, 2017b;Zhao et al, 2020). Previous study reported that BBX21 expression decreased in transcriptome at rst and then gradually increased after 6 to 48 h of light exposure.…”

Section: Discussionmentioning

confidence: 99%

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Transcriptional Regulation of Photomorphogenesis in Brassica Napus Under Different Light Quality

Zhang¹,

Liu²,

Huang³

et al. 2020

Preprint

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Background: Plants undergo skotomorphogenesis or photomorphogenesis upon the absence or presence of light. Although the light signaling pathway has been well documented in Arabidopsis, relatively little is known in other plant species including Brassica napus.Results: In this study, we examined the response of hypocotyl elongation to different light quality (white, blue, red and far-red light) in B. napus. The result showed each of tested light quality promoted photomorphogenesis, with less effect of red light than blue/far-red light. Subsequently, RNA-sequencing was performed to obtain the transcriptomic profile in B. napus in response to dark and different light quality. A total of 9748 genes were differentially expressed among treatments. Correlation analysis and hierarchical cluster analysis of differentially expressed genes (DEGs) indicated the transcriptomic profile in red light exhibited an analogous pattern with that in dark to some extent, while blue/far-red light induced transcriptional profiles showed distinct patterns. Moreover, we found the differential expressions of PHYB, COP1 and BBXs homologs between two subgenomes, which may affect their interactions with up/downstream pathway. Finally, we constructed a transcriptional network including light signaling, phytohormone and cell elongation/modification, which explained the observed hypocotyl phenotype under different light quality.Conclusions: We partially explained why red light has reduced effect on photomorphogenesis in B. napus by RNA-seq and displayed gene expression of the key regulators in light signaling pathway and their contribution to photomorphogenesis under different light quality in B. napus. The result could improve new sight into understanding on transcriptional regulation of photomorphogenesis of B. napus.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 93%

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Transcriptional Regulation of Photomorphogenesis in Brassica Napus Under Different Light Quality

Zhang¹,

Liu²,

Huang³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Upon light irradiation, BBX21 directly binds to BBX22, HY5 and its own promoter regions and activates their transcription [11][12][13]. Moreover, both BBX21 and HY5 can associates with the BBX11 promoter to promote its transcription, while BBX11 binds to the HY5 promoter to activate its transcription [14]. Thus, these three TFs (BBX21, HY5 and BBX11), regulate the transcription, forming a positive feedback loop that precisely regulates plants photomorphogenesis.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, BBX2-9 and BBX13-16 interacts with COP1 in vitro, indicating a role for COP1 in controlling the stability of these proteins in darkness [33]. Nevertheless, COP1 preferentially stabilizes BBX11 instead of promoting its degradation [14], which suggests that COP1 likely regulates a yet unidenti ed protein degradating BBX11.…”

Section: Introductionmentioning

confidence: 99%

Genome-Wide Characterization of B-BOX Gene Family and Their Responses to Light Quality and Cold Stress in Tomato

Wang

Yan

et al. 2020

Preprint

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Background: Perceiving incoming environmental information is critical for optimizing plant growth and development. Multiple B-box proteins (BBXs) play essential roles in light-dependent developmental processes in plants. However, whether BBXs function as a signal integrator between light and temperature in tomato plants remains elusive.Results: In this study, 31 SlBBX genes were identified from the newly released tomato (Solanum lycopersicum) genome sequences, and were clustered into five subgroups with phylogenetic analysis. Gene structure and protein motif analyses showed relatively high conservation of closely clustered SlBBX genes within each subgroup; however, genome mapping analysis indicated the uneven distribution of the SlBBX genes on tomato chromosomes. Synteny analysis indicated that segmental duplication events happened in the expansion of the SlBBX genes in tomato. Promoter cis-regulatory elements prediction indicated that SlBBX genes were highly responsive to light, hormones, and stress conditions. Furthermore, the transcript analysis revealed that various SlBBX genes differed significantly in expression after exposure to different light quality and low temperatures, while 61.3% of SlBBX genes were responsive to both light and low temperatures. Conclusions: Our study presented a genome-wide survey of SlBBX gene family in tomato, and emphasized their functions in perceiving light quality and low temperature, which may improve the current understanding of SlBBX gene functions in integrating light and temperature signals for plant adaptation to adverse environments.

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Transcriptional regulation of photomorphogenesis in seedlings of Brassica napus under different light qualities

Zhang

Fang

Huang

et al. 2022

Planta

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A Positive Feedback Loop of BBX11–BBX21–HY5 Promotes Photomorphogenic Development in Arabidopsis

Cited by 50 publications

References 55 publications

Transcriptional Regulation of Photomorphogenesis in Brassica Napus Under Different Light Quality

Transcriptional Regulation of Photomorphogenesis in Brassica Napus Under Different Light Quality

Genome-Wide Characterization of B-BOX Gene Family and Their Responses to Light Quality and Cold Stress in Tomato

Transcriptional regulation of photomorphogenesis in seedlings of Brassica napus under different light qualities

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