BBX24 Interacts with DELLA to Regulate UV-B-Induced Photomorphogenesis in Arabidopsis thaliana

Huang, Yuewei; Xiong, Hui; Xie, Youhua; Lyu, Suihua; TingTing, Miao; Li, Tingting; Lyu, Guizhen; Li, Shaoshan

doi:10.3390/ijms23137386

Cited by 9 publications

(5 citation statements)

References 41 publications

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“…In simulated shade, BBX24 can sequester DELLA to promote elongation responses through PIF4 activity [23,24]. More recently, it has been suggested that the module of HY5-BBX24-DELLA can control the crosstalk between GA and UV-B signaling to regulate hypocotyl inhibition [21]. Together, our results suggest that BBX24 can promote seed germination in suboptimal stressful environments by integrating ABA and GA signals.…”

Section: Discussionsupporting

confidence: 56%

“…Several BBX proteins have been documented to be involved in seedling de-etiolation, synthesis of anthocyanins, shade avoidance, flowering and responses to abiotic and biotic stresses [13,16]. BBX24 has been documented to inhibit seedling deetiolation [17][18][19][20], repress UVB signaling [21,22] and promote shade avoidance [17,23,24] and flowering [25]. BBX24 was originally isolated as a SALT-TOLERANT (STO) protein in an Arabidopsis cDNA clone screen that conferred increased salt-tolerance in Saccharomyces cerevisiae [26,27].…”

Section: Introductionmentioning

confidence: 99%

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BBX24 Increases Saline and Osmotic Tolerance through ABA Signaling in Arabidopsis Seeds

Chiriotto

Saura-Sánchez

Barraza

et al. 2023

Plants

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Seed germination is a critical stage for survival during the life cycle of an individual plant. Genetic and environmental cues are integrated by individual seeds to determine germination, mainly achieved through regulation of the metabolism and signaling of gibberellins (GA) and abscisic acid (ABA), two phytohormones with antagonistic roles. Saline and drought conditions can arrest the germination of seeds and limit the seedling emergence and homogeneity of crops. This work aimed to study the function of BBX24, a B-Box transcription factor, in the control of germination of Arabidopsis thaliana seeds imbibed in saline and osmotic conditions. Seeds of mutant and reporter GUS lines of BBX24 were incubated at different doses of NaCl and polyethylene-glycol (PEG) solutions and with ABA, GA and their inhibitors to evaluate the rate of germination. We found that BBX24 promotes seed germination under moderated stresses. The expression of BBX24 is inhibited by NaCl and PEG. In addition, ABA suppresses BBX24-induced seed germination. Additional experiments suggest that BBX24 reduces ABA sensitivity, improving NaCl tolerance, and increases GA sensitivity in seeds imbibed in ABA. In addition, BBX24 inhibits the expression of ABI3 and ABI5 and genetically interacts upstream of HY5 and ABI5. This study demonstrates the relevance of BBX24 to induce drought and salinity tolerance in seed germination to ensure seedling emergence in sub-optimal environments.

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Section: Discussionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

BBX24 Increases Saline and Osmotic Tolerance through ABA Signaling in Arabidopsis Seeds

Chiriotto

Saura-Sánchez

Barraza

et al. 2023

Plants

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“…However, little is known about how BBX genes coordinate with genes from phytohormone signaling pathways to regulate UV-B-induced physiology and development in plants. AtBBX24 interacts with DELLA proteins in the GA pathway to regulate UV-B-induced photomorphogenesis in Arabidopsis [ 28 , 70 ]. We determined that 11 VcBBX s respond to UV-B radiation, and their expression was significantly correlated with that of many genes involved in phytohormone signaling pathways, especially the auxin, ethylene, and BR pathways.…”

Section: Discussionmentioning

confidence: 99%

Genome-wide analysis of blueberry B-box family genes and identification of members activated by abiotic stress

Liu,

Sun,

et al. 2023

BMC Genomics

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Background B-box (BBX) proteins play important roles in regulating plant growth, development, and abiotic stress responses. BBX family genes have been identified and functionally characterized in many plant species, but little is known about the BBX family in blueberry (Vaccinium corymbosum). Result In this study, we identified 23 VcBBX genes from the Genome Database for Vaccinium (GDV). These VcBBXs can be divided into five clades based on gene structures and conserved domains in their encoded proteins. The prediction of cis-acting elements in the upstream sequences of VcBBX genes and protein–protein interactions indicated that VcBBX proteins are likely involved in phytohormone signaling pathways and abiotic stress responses. Analysis of transcriptome deep sequencing (RNA-seq) data showed that VcBBX genes exhibited organ-specific expression pattern and 11 VcBBX genes respond to ultraviolet B (UV-B) radiation. The co-expression analysis revealed that the encoded 11 VcBBX proteins act as bridges integrating UV-B and phytohormone signaling pathways in blueberry under UV-B radiation. Reverse-transcription quantitative PCR (RT-qPCR) analysis showed that most VcBBX genes respond to drought, salt, and cold stress. Among VcBBX proteins, VcBBX24 is highly expressed in all the organs, not only responds to abiotic stress, but it also interacts with proteins in UV-B and phytohormone signaling pathways, as revealed by computational analysis and co-expression analysis, and might be an important regulator integrating abiotic stress and phytohormone signaling networks. Conclusions Twenty-three VcBBX genes were identified in blueberry, in which, 11 VcBBX genes respond to UV-B radiation, and act as bridges integrating UV-B and phytohormone signaling pathways according to RNA-seq data. The expression patterns under abiotic stress suggested that the functional roles of most VcBBX genes respose to drought, salt, and cold stress. Our study provides a useful reference for functional analysis of VcBBX genes and for improving abiotic stress tolerance in blueberry.

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“…Whether this is also the case for true leaves, is to our knowledge not reported. Other interaction partners include GAI‐ASSOCIATED FACTOR 1 (GAF1)/INDETERMINATE DOMAIN 2 (IDD2), with the double idd1 idd2 mutant showing a semi‐dwarf plant phenotype (Fukazawa et al., 2021), and ELONGATED HYPOCOTYL 5 (HY5), of which a loss‐of‐function hy5 mutation results in bigger cotyledons and first leaves (Huang et al., 2022; Sibout et al., 2006).…”

Section: Ga/della Pathwaymentioning

confidence: 99%

Leaf growth – complex regulation of a seemingly simple process

Schneider,

Van Bel,

Inzé

et al. 2023

The Plant Journal

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SUMMARYUnderstanding the underlying mechanisms of plant development is crucial to successfully steer or manipulate plant growth in a targeted manner. Leaves, the primary sites of photosynthesis, are vital organs for many plant species, and leaf growth is controlled by a tight temporal and spatial regulatory network. In this review, we focus on the genetic networks governing leaf cell proliferation, one major contributor to final leaf size. First, we provide an overview of six regulator families of leaf growth in Arabidopsis: DA1, PEAPODs, KLU, GRFs, the SWI/SNF complexes, and DELLAs, together with their surrounding genetic networks. Next, we discuss their evolutionary conservation to highlight similarities and differences among species, because knowledge transfer between species remains a big challenge. Finally, we focus on the increase in knowledge of the interconnectedness between these genetic pathways, the function of the cell cycle machinery as their central convergence point, and other internal and environmental cues.

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BBX24 Interacts with DELLA to Regulate UV-B-Induced Photomorphogenesis in Arabidopsis thaliana

Abstract: Abstracts: UV-B radiation, sensed by the photoreceptor UVR8, induces signal transduction for plant photomorphogenesis [...]

Cited by 9 publications

References 41 publications

BBX24 Increases Saline and Osmotic Tolerance through ABA Signaling in Arabidopsis Seeds

BBX24 Increases Saline and Osmotic Tolerance through ABA Signaling in Arabidopsis Seeds

Genome-wide analysis of blueberry B-box family genes and identification of members activated by abiotic stress

Leaf growth – complex regulation of a seemingly simple process

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