Phytochrome interacting factors 4 and 5 regulate axillary branching via bud abscisic acid and stem auxin signalling

Holalu, Srinidhi V.; Reddy, Srirama Krishna; Blackman, Benjamin K.; Finlayson, Scott A.

doi:10.1111/pce.13824

Cited by 37 publications

(26 citation statements)

References 90 publications

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“…Shade suppresses axillary bud outgrowth and thus reducing branching. phyB inactivation or PIF4/PIF5 overexpression leads to branching repression in both high and low R/FR light conditions (Holalu et al 2020;Reddy and Finlayson 2014;Xie et al 2017). A major genetic pathway regulating branch outgrowth is the TB1/FC1/BRC1 pathway that represses axillary bud outgrowth in both monocots and dicots (Wang et al 2019).…”

Section: Integration Of Light With Various Hormones In Regulating Different Aspects Of Sasmentioning

confidence: 99%

Integration of light and hormone signaling pathways in the regulation of plant shade avoidance syndrome

2021

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As sessile organisms, plants are unable to move or escape from their neighboring competitors under high-density planting conditions. Instead, they have evolved the ability to sense changes in light quantity and quality (such as a reduction in photoactive radiation and drop in red/far-red light ratios) and evoke a suite of adaptative responses (such as stem elongation, reduced branching, hyponastic leaf orientation, early flowering and accelerated senescence) collectively termed shade avoidance syndrome (SAS). Over the past few decades, much progress has been made in identifying the various photoreceptor systems and light signaling components implicated in regulating SAS, and in elucidating the underlying molecular mechanisms, based on extensive molecular genetic studies with the model dicotyledonous plant Arabidopsis thaliana. Moreover, an emerging synthesis of the field is that light signaling integrates with the signaling pathways of various phytohormones to coordinately regulate different aspects of SAS. In this review, we present a brief summary of the various cross-talks between light and hormone signaling in regulating SAS. We also present a perspective of manipulating SAS to tailor crop architecture for breeding high-density tolerant crop cultivars.

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Section: Integration Of Light With Various Hormones In Regulating Different Aspects Of Sasmentioning

confidence: 99%

Integration of light and hormone signaling pathways in the regulation of plant shade avoidance syndrome

2021

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“…It may be expected that MSTRG.52498.1, MSTRG.28198.1, and MSTRG.42201.1 increase the levels of Czrog, IPR, tZOG, and tZR, thus inhibiting the expression of CKX. ABA is another major plant hormone that plays a key role in plant responses to abiotic and biological stresses and inhibits seed germination and lateral branch growth ( Holalu et al, 2020 ). PP2C is the second messenger in the ABA signal transduction pathway.…”

Section: Discussionmentioning

confidence: 99%

Comprehensive Analysis of Long Non-coding RNA Modulates Axillary Bud Development in Tobacco (Nicotiana tabacum L.)

et al. 2022

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Long non-coding RNAs (lncRNAs) regulate gene expression and are crucial for plant growth and development. However, the mechanisms underlying the effects of activated lncRNAs on axillary bud development remain largely unknown. By lncRNA transcriptomes of axillary buds in topped and untopped tobacco plants, we identified a total of 13,694 lncRNAs. LncRNA analysis indicated that the promoted growth of axillary bud by topping might be partially ascribed to the genes related to hormone signal transduction and glycometabolism, trans-regulated by differentially expressed lncRNAs, such as MSTRG.52498.1, MSTRG.60026.1, MSTRG.17770.1, and MSTRG.32431.1. Metabolite profiling indicated that auxin, abscisic acid and gibberellin were decreased in axillary buds of topped tobacco lines, while cytokinin was increased, consistent with the expression levels of related lncRNAs. MSTRG.52498.1, MSTRG.60026.1, MSTRG.17770.1, and MSTRG.32431.1 were shown to be influenced by hormones and sucrose treatments, and were associated with changes of axillary bud growth in the overexpression of NtCCD8 plants (with reduced axillary buds) and RNA interference of NtTB1 plants (with increased axillary buds). Moreover, MSTRG.28151.1 was identified as the antisense lncRNA of NtTB1. Silencing of MSTRG.28151.1 in tobacco significantly attenuated the expression of NtTB1 and resulted in larger axillary buds, suggesting the vital function of MSTRG.28151.1 axillary bud developmen by NtTB1. Our findings shed light on lncRNA-mRNA interactions and their functional roles in axillary bud growth, which would improve our understanding of lncRNAs as important regulators of axillary bud development and plant architecture.

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“…González-Grandío et al and Zhang et al revealed that ABA signalling plays a negative role in branching downstream of BRC1 [ 15 , 46 ]. Holalu et al showed that ABA accumulation in axillary buds works downstream of PIF for shade avoidance responses [ 47 ]. In our study, the ABA level was significantly decreased after CYC treatment compared with the control at 168 h ( Figure 2 ).…”

Section: Discussionmentioning

confidence: 99%

Cyclanilide Induces Lateral Bud Outgrowth by Modulating Cytokinin Biosynthesis and Signalling Pathways in Apple Identified via Transcriptome Analysis

Xie

Zhao

et al. 2022

IJMS

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Cyclanilide (CYC), a plant growth regulator, is a potent shoot branching agent in apple. However, its mechanism remains unclear. The current study revealed that CYC treatment resulted in massive reprogramming of the axillary bud transcriptome, implicating several hormones in the response. We observed a marked increase (approximately 2-fold) in the level of zeatin riboside and a significant decrease (approximately 2-fold) in the level of abscisic acid (ABA). Zeatin metabolism gene cytokinin (CTK) oxidase 1 (CKX 1) was down-regulated at 168 h after CYC treatment compared with the control. Weighted gene co-expression network analysis of differentially expressed genes demonstrated the turquoise module clusters exhibited the highest positive correlation with zeatin riboside (r = 0.92) and the highest negative correlation with ABA (r = −0.8). A total of 37 genes were significantly enriched in the plant hormone signal transduction pathway in the turquoise module. Among them, the expressions of CTK receptor genes WOODEN LEG and the CTK type-A response regulators genes ARR3 and ARR9 were up-regulated. ABA signal response genes protein phosphatase 2C genes ABI2 and ABI5 were down-regulated in lateral buds after CYC treatment at 168 h. In addition, exogenous application of 6-benzylaminopurine (6-BA, a synthetic type of CTK) and CYC enhanced the inducing effect of CYC, whereas exogenous application of lovastatin (a synthetic type of inhibitor of CTK biosynthesis) or ABA and CYC weakened the promoting effect of CYC. These results collectively revealed that the stimulation of bud growth by CYC might involve CTK biosynthesis and signalling, including genes CKX1 and ARR3/9, which provided a direction for further study of the branching promoting mechanism of CYC.

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Phytochrome interacting factors 4 and 5 regulate axillary branching via bud abscisic acid and stem auxin signalling

Cited by 37 publications

References 90 publications

Integration of light and hormone signaling pathways in the regulation of plant shade avoidance syndrome

Integration of light and hormone signaling pathways in the regulation of plant shade avoidance syndrome

Comprehensive Analysis of Long Non-coding RNA Modulates Axillary Bud Development in Tobacco (Nicotiana tabacum L.)

Cyclanilide Induces Lateral Bud Outgrowth by Modulating Cytokinin Biosynthesis and Signalling Pathways in Apple Identified via Transcriptome Analysis

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