Auxin Contributes to the Intraorgan Regulation of Gene Expression in Response to Shade

Kim, Sujung; Mochizuki, Naoki; Deguchi, Ayumi; Nagano, Atsushi J.; Suzuki, Tomoo; Nagatani, Akira

doi:10.1104/pp.17.01259

Cited by 14 publications

(11 citation statements)

References 78 publications

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“…2e). This is consistent with tissue-specific expression analysis of PIF4 , PIF5 , and PIF7 35,36 , indicating that PIF4 , PIF5 , PIF7 , FT , and TSF are expressed in the vasculature. FT mRNA expression in the wild type displayed two strong peaks in response to low R/FR, the first early in the light period and the highest peak around dusk, and a third smaller peak during the night (Fig.…”

Section: Resultssupporting

confidence: 88%

PIF transcription factors link a neighbor threat cue to accelerated reproduction in Arabidopsis

et al. 2019

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Changes in light quality indicative of competition for this essential resource influence plant growth and developmental transitions; however, little is known about neighbor proximity-induced acceleration of reproduction. Phytochrome B (phyB) senses light cues from plant competitors, ultimately leading to the expression of the floral inducers FLOWERING LOCUS T ( FT ) and TWIN SISTER of FT ( TSF ). Here we show that PHYTOCHROME INTERACTING FACTORs 4, 5 and 7 (PIF4, PIF5 and PIF7) mediate neighbor proximity-induced flowering, with PIF7 playing a prominent role. These transcriptional regulators act directly downstream of phyB to promote expression of FT and TSF . Neighbor proximity enhances PIF accumulation towards the end of the day, coinciding with enhanced floral inducer expression. We present evidence supporting direct PIF-regulated TSF expression. The relevance of our findings is illustrated by the prior identification of FT , TSF and PIF4 as loci underlying flowering time regulation in natural conditions.

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Section: Resultssupporting

confidence: 88%

PIF transcription factors link a neighbor threat cue to accelerated reproduction in Arabidopsis

et al. 2019

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“…DEGs related to hormone functions (e.g., biosynthesis, signal transduction) were also identified. The following studies were used to select each hormone-related genes from DEGs : Auxin (Kim et al 2018;Ljung 2013;Winkler et al 2017), Brassinosteroids (Chung and Choe 2013; Clouse 2011), Gibberellins (Sun 2008), Cytokinins (Kieber and Schaller 2014), ABA (Fujita et al 2009;Hauser et al 2011;Hauser et al 2017;Kwak et al 2002;Nambara and Marion-poll 2005;Schweighofer et al 2004;Yoshida et al 2015), Ethylene (Guo and Ecker 2004;Schaller and Kieber 2002;Yoo et al 2009), Jasmonates (Acosta and Farmer 2010; Wasternack and Hause 2013), Salicylic acid (Dempsey et al 2011;Seyfferth and Tsuda 2014).…”

Section: Methodsmentioning

confidence: 99%

Regulation of hormone-related genes involved in adventitious root formation in sweetpotato

et al. 2020

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The sweetpotatoes (Ipomoea batatas) generate adventitious roots (ARs) from cut stems that develop into storage roots and make for an important means of propagation. However, few studies have investigated the hormones involved in AR development in sweetpotato. In this study, the expression patterns of hormone-related genes involved in AR formation were identified using the transcriptome data. RNA-seq data from stems grown for 0 and 3 days after cutting were analyzed. In addition, hormone-related genes were identified among differentially expressed genes (DEGs) and filtered genes, and cluster analysis was used to characterize expression patterns by function. Most hormone-related regulated genes expressed 3 days after growing the cut stems were abscisic acid (ABA)related genes, followed by ethylene-and auxin-related genes. For ABA, the biosynthesis genes (including genes annotated to NINE-CIS-EPOXYCAROTENOID DIOXYGENASE 3 (NCED3)) and signal transduction and perception genes (including genes annotated to PROTEIN PHOSPHATASE 2Cs (PP2Cs)) tended to decrease. Expression patterns of auxin-and ethylene-related genes differed by function. These results suggest that ABA, auxin, and ethylene genes are involved in AR formation and that they may be regulated in a hormone function-dependent manner. These results contribute to the identification of hormone functions during AR formation and may contribute to understanding the mechanism of AR formation in the sweetpotato.

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“…Subjecting the tip of the cotyledon or leaf to low R:FR significantly induces hyponastic growth. Interestingly, this only occurs in the abaxial side of the petiole of the leaf that has perceived FR, but not in other rosette leaves (Figure 1) (Muller-Moule et al, 2016; Michaud et al, 2017; Pantazopoulou et al, 2017; Kim et al, 2018). By contrast, subjecting whole plants to low R:FR conditions induces elongation of both the abaxial and adaxial sides of the petiole (Figure 1; Michaud et al, 2017; Pantazopoulou et al, 2017).…”

Section: Introductionmentioning

confidence: 96%

Auxin-Dependent Cell Elongation During the Shade Avoidance Response

2019

Front. Plant Sci.

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Plant uses multiple photoreceptors and downstream components to rapidly respond to dynamic changes in environmental light. Under shade conditions, many species exhibit shade avoidance responses that promote stem and petiole elongation, thus helping plants reach the sunlight. In the last few years, the regulatory molecular mechanisms by which plants respond to shade signals have been intensively studied. This review discusses the regulatory mechanisms underlying auxin-mediated cell elongation in the shade avoidance responses. In the early response to shade signals, auxin biosynthesis, transport, and sensitivity are all rapidly activated, thus promoting cell elongation of the hypocotyls and other organs. Under prolonged shade, increased auxin sensitivity—rather than increased auxin biosynthesis—plays a major role in cell elongation. In addition, we discuss the interaction network of photoreceptors and Phytochrome-Interacting Factors, and the antagonistic regulation of Auxin/Indole Acetic Acid proteins by auxin and light. This review provides perspectives to reframe how we think about shade responses in the natural environment.

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Auxin Contributes to the Intraorgan Regulation of Gene Expression in Response to Shade

Cited by 14 publications

References 78 publications

PIF transcription factors link a neighbor threat cue to accelerated reproduction in Arabidopsis

PIF transcription factors link a neighbor threat cue to accelerated reproduction in Arabidopsis

Regulation of hormone-related genes involved in adventitious root formation in sweetpotato

Auxin-Dependent Cell Elongation During the Shade Avoidance Response

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