IPA1: a direct target of SL signaling

Kerr, Stephanie C.; Beveridge, Christine A.

doi:10.1038/cr.2017.114

Cited by 15 publications

(10 citation statements)

References 10 publications

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“…SL signaling-related knowledge has been rapidly increasing. Recently, a study indicated that a transcription factor, IDEAL PLANT ARCHITECTURE1 ( IPA1 ), is directly involved to SL signaling and regulates shoot branching [67] (Figure 5). However, this pathway still lacks basic answer, particularly, the molecular mechanism which identifies its downstream genes, and those genes are the direct or indirect target.…”

Section: Discussionmentioning

confidence: 99%

Strigolactone Signaling Genes Showing Differential Expression Patterns in Arabidopsis max Mutants

Kumar

Kim

et al. 2019

Plants

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Strigolactone (SL) is a recently discovered class of phytohormone that inhibits shoot branching. The molecular mechanism underlying SL biosynthesis, perception, and signal transduction is vital to the plant branching phenotype. Some aspects of their biosynthesis, perception, and signaling include the role of four MORE AXILLARY GROWTH genes, MAX3, MAX4, MAX1, and MAX2. It is important to identify downstream genes that are involved in SL signaling. To achieve this, we studied the genomic aspects of the strigolactone biosynthesis pathway using microarray analysis of four max mutants. We identified SL signaling candidate genes that showed differential expression patterns in max mutants. More specifically, 1-AMINOCYCLOPROPANE-1-CARBOXYLATE SYNTHASE 4 (ACC4) and PROTEIN KINASE 3 (PKS3) displayed contrasting expression patterns, indicating a regulatory mechanism in SL signaling pathway to control different phenotypes apart from branching phenotype.

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Section: Discussionmentioning

confidence: 99%

Strigolactone Signaling Genes Showing Differential Expression Patterns in Arabidopsis max Mutants

Kumar

Kim

et al. 2019

Plants

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“…Mutants deficient in D53 -like genes indeed displayed constitutive BRC1 upregulation (Soundappan et al, 2015; Wang et al, 2015; Seale et al, 2017). Moreover, SL perception by D14 (α/β hydrolase) and the recruitment of the SCF complex resulted in the polyubiquitination and 26S-proteasome–mediated degradation of D53 (Kerr and Beveridge, 2017; Waters et al, 2017). D53 physically interacts with IPA1 (IDEAL PLANT ARCHITECTURE1), a repressor of shoot branching, and prevents it from upregulating TB1 expression (Figure 1) (Song et al, 2017).…”

Section: Brc1 Is An Integrator Of Diverse Hormonal Signaling Networkmentioning

confidence: 99%

BRANCHED1: A Key Hub of Shoot Branching

et al. 2019

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Shoot branching is a key process for plant growth and fitness. Newly produced axes result from axillary bud outgrowth, which is at least partly mediated through the regulation of BRANCHED1 gene expression (BRC1/TB1/FC1). BRC1 encodes a pivotal bud-outgrowth-inhibiting transcription factor belonging to the TCP family. As the regulation of BRC1 expression is a hub for many shoot-branching-related mechanisms, it is influenced by endogenous (phytohormones and nutrients) and exogenous (light) inputs, which involve so-far only partly identified molecular networks. This review highlights the central role of BRC1 in shoot branching and its responsiveness to different stimuli, and emphasizes the different knowledge gaps that should be addressed in the near future.

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“…IPA1 also influences immunity and particular IPA1 alleles can significantly enhance grain yield in rice (Wang et al, 2018b). Thus, SLs induce D53 degradation and subsequent de-repression of the activity of IPA1 and other transcription factors, which in turn activates downstream genes to suppress tillering (Fang et al, 2020;Kerr and Beveridge, 2017;Song et al, 2017;Yao et al, 2018). Recently, CYTOKININ OXIDASE/DEHYDROGENASE 9 (OsCKX9) has been identified as an SL-responsive gene required for cytokinin degradation and rice tillering independently of IPA1 (Duan et al, 2019).The level of SLs is therefore thought to be a key factor in controlling bud outgrowth.…”

Section: Introductionmentioning

confidence: 99%

ζ-Carotene Isomerase Suppresses Tillering in Rice through the Coordinated Biosynthesis of Strigolactone and Abscisic Acid

Yan

et al. 2020

Molecular Plant

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Rice tillering is an important agronomic trait affecting grain yield. Here, we identified a high-tillering mutant tillering20 (t20), which could be restored to the wild type by treatment with the strigolactone (SL) analog rac-GR24. T20 encodes a chloroplast z-carotene isomerase (Z-ISO), which is involved in the biosynthesis of carotenoids and their metabolites, SL and abscisic acid (ABA). The t20 mutant has reduced SL and ABA, raising the question of how SL and ABA biosynthesis is coordinated, and whether they have overlapping functions in tillering. We discovered that rac-GR24 stimulated T20 expression and enhanced all-transb-carotene biosynthesis. Importantly, rac-GR24 also stimulated expression of Oryza sativa 9-CIS-EPOXY-CAROTENOID DIOXYGENASE 1 (OsNCED1) through induction of Oryza sativa HOMEOBOX12 (OsHOX12), promoting ABA biosynthesis in shoot base. On the other hand, ABA treatment significantly repressed SL biosynthesis and the ABA biosynthetic mutants displayed elevated SL biosynthesis. ABA treatment reduced the number of basal tillers in both t20 and wild-type plants. Furthermore, while ABA-deficient mutants aba1 and aba2 had the same number of basal tillers as wild type, they had more unproductive upper tillers at maturity. This work demonstrates complex interactions in the biosynthesis of carotenoid, SLs and ABA, and reveals a role for ABA in the regulation of rice tillering.

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IPA1: a direct target of SL signaling

Cited by 15 publications

References 10 publications

Strigolactone Signaling Genes Showing Differential Expression Patterns in Arabidopsis max Mutants

Strigolactone Signaling Genes Showing Differential Expression Patterns in Arabidopsis max Mutants

BRANCHED1: A Key Hub of Shoot Branching

ζ-Carotene Isomerase Suppresses Tillering in Rice through the Coordinated Biosynthesis of Strigolactone and Abscisic Acid

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