Phytochromes A and B Mediate Light Stabilization of BIN2 to Regulate Brassinosteroid Signaling and Photomorphogenesis in Arabidopsis

Zhao, Jiachen; Yang, Guangqiong; Jiang, Lu; Zhang, Shilong; Miao, Langxi; Xu, Peng; Chen, Huiru; Chen, Li; Mao, Zhilei; Guo, Tongtong; Kou, Shuang; Hong-yuan, Yang; Wang, Wenxiu

doi:10.3389/fpls.2022.865019

Cited by 9 publications

(6 citation statements)

References 69 publications

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“…The BR pathway intersects with light and ABA signalling at many levels. Light is known to inhibit BR biosynthesis, to stabilize or activate BIN2 and to impact BR-responsive transcriptional regulation [53][54][55][56][57]; reviewed by [36,58,59]. BIN2 modulates light responses by phosphorylating PIFs, transcriptional regulators inhibited by phytochromes, thereby targeting them for degradation [60,61].…”

Section: Discussionmentioning

confidence: 99%

A role for brassinosteroid signalling in decision-making processes in the Arabidopsis seedling

Kalbfuß

Strohmayr²,

Kegel³

et al. 2022

PLoS Genet

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Plants often adapt to adverse conditions via differential growth, whereby limited resources are discriminately allocated to optimize the growth of one organ at the expense of another. Little is known about the decision-making processes that underly differential growth. In this study, we developed a screen to identify decision making mutants by deploying two tools that have been used in decision theory: a well-defined yet limited budget, as well as conflict-of-interest scenarios. A forward genetic screen that combined light and water withdrawal was carried out. This identified BRASSINOSTEROID INSENSITIVE 2 (BIN2) alleles as decision mutants with “confused” phenotypes. An assessment of organ and cell length suggested that hypocotyl elongation occurred predominantly via cellular elongation. In contrast, root growth appeared to be regulated by a combination of cell division and cell elongation or exit from the meristem. Gain- or loss- of function bin2 mutants were most severely impaired in their ability to adjust cell geometry in the hypocotyl or cell elongation as a function of distance from the quiescent centre in the root tips. This study describes a novel paradigm for root growth under limiting conditions, which depends not only on hypocotyl-versus-root trade-offs in the allocation of limited resources, but also on an ability to deploy different strategies for root growth in response to multiple stress conditions.

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Section: Discussionmentioning

confidence: 99%

A role for brassinosteroid signalling in decision-making processes in the Arabidopsis seedling

Kalbfuß

Strohmayr²,

Kegel³

et al. 2022

PLoS Genet

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“…PhyA controlling the stability of light-responsive genes is well studied. However, how phyA rapidly controls the transcription of light-responsive transcription factors remains largely unknown ( 46 , 47 ). It is necessary to explore whether other phyA-activated light-responsive genes exhibit similar characteristics and whether this is a universal mechanism for the pattern of gene expression regulated by phyA signaling after etiolated seedlings are exposed to light.…”

Section: Discussionmentioning

confidence: 99%

Cooperative transcriptional regulation by ATAF1 and HY5 promotes light-induced cotyledon opening in Arabidopsis thaliana

Yao,

Fang,

Qiao

et al. 2024

Sci. Signal.

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The opening of the embryonic leaves (cotyledons) as seedlings emerge from the dark soil into the light is crucial to ensure the survival of the plant. Seedlings that sprout in the dark elongate rapidly to reach light but keep their cotyledons closed. During de-etiolation, the transition from dark to light growth, elongation slows and the cotyledons open. Here, we report that the transcription factor ACTIVATING FACTOR1 (ATAF1) participates in de-etiolation and facilitates light-induced cotyledon opening. The transition from dark to light rapidly induced ATAF1 expression and ATAF1 accumulation in cotyledons. Seedlings lacking or overexpressing ATAF1 exhibited reduced or enhanced cotyledon opening, respectively, and transcriptomic analysis indicated that ATAF1 repressed the expression of genes associated with growth and cotyledon closure. The activation of the photoreceptor phytochrome A (phyA) by far-red light induced its association with the ATAF1 promoter and stimulation of ATAF1 expression. The transcription factor ELONGATED HYPOCOTYL5 (HY5), which is also activated in response far-red light, cooperated with phyA to induce ATAF1 expression. ATAF1 and HY5 interacted with one another and cooperatively repressed the expression of growth-promoting and cotyledon closure genes. Together, our study reveals a mechanism through which far-red light promotes cotyledon opening.

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“…Notably, in the plant hormone transduction pathway of the iSAS-root based on RNA-seq analysis, three genes were obviously upregulated. Among them, BIN2 has been proven to directly interact with phyB and regulate BR signaling and photomorphogenesis in Arabidopsis ( Zhao et al, 2022 ). The hypocotyls of BIN2 bin2-1 gain-of-function mutants were found to be shorter than those of the wild type under R and FR light.…”

Section: Discussionmentioning

confidence: 99%

Genetic and transcriptome analyses reveal the candidate genes and pathways involved in the inactive shade-avoidance response enabling high-density planting of soybean

Zhao

Shi²,

Chen³

et al. 2022

Front. Plant Sci.

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High-density planting is a major way to improve crop yields. However, shade-avoidance syndrome (SAS) is a major factor limiting increased planting density. First Green Revolution addressed grass lodging problem by using dwarf/semi-dwarf genes. However, it is not suitable for soybean, which bear seeds on stalk and whose seed yield depends on plant height. Hence, mining shade-tolerant germplasms and elucidating the underlying mechanism could provide meaningful resources and information for high-yield breeding. Here, we report a high-plant density-tolerant soybean cultivar, JiDou 17, which exhibited an inactive SAS (iSAS) phenotype under high-plant density or low-light conditions at the seedling stage. A quantitative trait locus (QTL) mapping analysis using a recombinant inbred line (RIL) population showed that this iSAS phenotype is related to a major QTL, named shade-avoidance response 1 (qSAR1), which was detected. The mapping region was narrowed by a haplotype analysis into a 554 kb interval harboring 44 genes, including 4 known to be key regulators of the SAS network and 4 with a variance response to low-light conditions between near isogenic line (NIL) stems. Via RNA-seq, we identified iSAS-specific genes based on one pair of near isogenic lines (NILs) and their parents. The iSAS-specific genes expressed in the stems were significantly enriched in the “proteasomal protein catabolic” process and the proteasome pathway, which were recently suggested to promote the shade-avoidance response by enhancing PIF7 stability. Most iSAS-specific proteasome-related genes were downregulated under low-light conditions. The expression of genes related to ABA, CK, and GA significantly varied between the low- and normal-light conditions. This finding is meaningful for the cloning of genes that harbor beneficial variation(s) conferring the iSAS phenotype fixed in domestication and breeding practice.

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Phytochromes A and B Mediate Light Stabilization of BIN2 to Regulate Brassinosteroid Signaling and Photomorphogenesis in Arabidopsis

Cited by 9 publications

References 69 publications

A role for brassinosteroid signalling in decision-making processes in the Arabidopsis seedling

A role for brassinosteroid signalling in decision-making processes in the Arabidopsis seedling

Cooperative transcriptional regulation by ATAF1 and HY5 promotes light-induced cotyledon opening in Arabidopsis thaliana

Genetic and transcriptome analyses reveal the candidate genes and pathways involved in the inactive shade-avoidance response enabling high-density planting of soybean

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