Functional interrelation of <scp>MYC</scp>2 and <scp>HY</scp>5 plays an important role in Arabidopsis seedling development

Chakraborty, Moumita; Gangappa, Sreeramaiah N.; Maurya, Jay P.; Sethi, Vishmita; Srivastava, Archana; Singh, Aparna; Dutta, Siddhartha; Ojha, Madhusmita; Gupta, Nisha; Sengupta, Mandar; Ram, Hasthi; Chattopadhyay, Sudip

doi:10.1111/tpj.14381

Cited by 44 publications

(58 citation statements)

References 64 publications

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“…A recent report concluded that MYC2 acts as a negative regulator of blue light response based on analysis of the single mutant myc2-3 showing shorter hypocotyl under blue light (Chakraborty et al, 2019), which is inconsistent with our observation. We showed multiple lines of genetic and molecular evidence, through analysis of single, double, and triple mutants as well as overexpression lines of MYC2/ MYC3/MYC4, to reveal that MYC2/MYC3/MYC4 are positive regulators to transcriptionally activate HY5 expression and promote JA inhibition on hypocotyl elongation in the blue light, red and far-red light conditions.…”

Section: Discussioncontrasting

confidence: 99%

Light promotes jasmonate biosynthesis to regulate photomorphogenesis in Arabidopsis

Rong

Yan

Xie

2020

Sci. China Life Sci.

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Light acts as the pivotal external environment cue to modulate plant growth and development. Seeds germinate in the soil without light to undergo skotomorphogenesis with rapidly elongating hypocotyls that facilitate emergence from the soil, while seedlings upon light exposure undergo photomorphogenesis with significantly inhibited hypocotyl elongation that benefits plants to stand up firmly and cope with the changing environment. In this study, we demonstrate that light promotes jasmonate (JA) biosynthesis to inhibit hypocotyl elongation and orchestrate seedling photomorphogenesis in Arabidopsis. We showed that JAinhibition on hypocotyl elongation is dependent on JA receptor COI1 and signaling components such as repressor proteins JAZs and transcription activators MYC2/MYC3/MYC4. Furthermore, we found that MYC2/MYC3/MYC4 activate the expression of photomorphogenesis regulator HY5 to repress cell elongation-related genes (such as SAUR62 and EXP2) essential for seedling photomorphogenesis. Our findings provide a novel insight into molecular mechanisms underlying how plants integrate light signal with hormone pathway to establish seedling photomorphogenesis.

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Section: Discussioncontrasting

confidence: 99%

Light promotes jasmonate biosynthesis to regulate photomorphogenesis in Arabidopsis

Rong

Yan

Xie

2020

Sci. China Life Sci.

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“…The BRI1-EMS-SUPPRESSOR1 transcription factor controlled by Brassinosteroids was reported to participate in this process by antagonizing JA-activated plant defenses [105]. Moreover, the JAZ and MYC proteins interact with central proteins, such as DELLA, HY5, and IAA59 in other plant growth-related hormone-dependent pathways to fine tune defense and growth [106][107][108][109][110]. For instance, in Arabidopsis thaliana, gibberellin (GA) is often related to plant growth regulation.…”

Section: The Plant Defense-growth Trade-off Regulated By Jasmentioning

confidence: 99%

Manipulation of Jasmonate Signaling by Plant Viruses and Their Insect Vectors

Jian

2020

Viruses

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Plant viruses pose serious threats to stable crop yield. The majority of them are transmitted by insects, which cause secondary damage to the plant host from the herbivore-vector’s infestation. What is worse, a successful plant virus evolves multiple strategies to manipulate host defenses to promote the population of the insect vector and thereby furthers the disease pandemic. Jasmonate (JA) and its derivatives (JAs) are lipid-based phytohormones with similar structures to animal prostaglandins, conferring plant defenses against various biotic and abiotic challenges, especially pathogens and herbivores. For survival, plant viruses and herbivores have evolved strategies to convergently target JA signaling. Here, we review the roles of JA signaling in the tripartite interactions among plant, virus, and insect vectors, with a focus on the molecular and biochemical mechanisms that drive vector-borne plant viral diseases. This knowledge is essential for the further design and development of effective strategies to protect viral damages, thereby increasing crop yield and food security.

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“…HY5, encoding a bZIP-type transcription factor, is a hub gene in the early light response [3]. Loss-of-function mutants show inhibition of photomorphogenesis, such as long hypocotyls and small cotyledons, when they are young seedlings [7][8][9][10][11]. Our previous transcriptomic analyses revealed that the response of some light-responsive genes to blue light exposure after darkness was reduced in hy5 [6,23].…”

Section: Discussionmentioning

confidence: 99%

Time-Course Transcriptome Study Reveals Mode of bZIP Transcription Factors on Light Exposure in Arabidopsis

Kurihara

Makita

Shimohira

et al. 2020

IJMS

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The etiolation process, which occurs after germination, is terminated once light is perceived and then de-etiolation commences. During the de-etiolation period, monochromatic lights (blue, red and far-red) induce differences in gene expression profiles and plant behavior through their respective photoreceptors. ELONGATED HYPOCOTYL 5 (HY5), a bZIP-type transcription factor (TF), regulates gene expression in the de-etiolation process, and other bZIP TFs are also involved in this regulation. However, transcriptomic changes that occur in etiolated seedlings upon monochromatic light irradiation and the relationship with the bZIP TFs still remain to be elucidated. Here, we track changes in the transcriptome after exposure to white, blue, red and far-red light following darkness and reveal both shared and non-shared trends of transcriptomic change between the four kinds of light. Interestingly, after exposure to light, HY5 expression synchronized with those of the related bZIP TF genes, GBF2 and GBF3, rather than HY5 HOMOLOG (HYH). To speculate on the redundancy of target genes between the bZIP TFs, we inspected the genome-wide physical binding sites of homodimers of seven bZIP TFs, HY5, HYH, GBF1, GBF2, GBF3, GBF4 and EEL, using an in vitro binding assay. The results reveal large overlaps of target gene candidates, indicating a complicated regulatory literature among TFs. This work provides novel insight into understanding the regulation of gene expression of the plant response to monochromatic light irradiation.

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Functional interrelation of MYC2 and HY5 plays an important role in Arabidopsis seedling development

Cited by 44 publications

References 64 publications

Light promotes jasmonate biosynthesis to regulate photomorphogenesis in Arabidopsis

Light promotes jasmonate biosynthesis to regulate photomorphogenesis in Arabidopsis

Manipulation of Jasmonate Signaling by Plant Viruses and Their Insect Vectors

Time-Course Transcriptome Study Reveals Mode of bZIP Transcription Factors on Light Exposure in Arabidopsis

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