PCH1 integrates circadian and light-signaling pathways to control photoperiod-responsive growth in Arabidopsis

Huang, He; Yoo, Chan Yul; Bindbeutel, Rebecca K.; Goldsworthy, Jessica; Tielking, Allison; Alvarez, Sophie; Naldrett, Michael J.; Evans, Bradley S.; Chen, Meng; Nusinow, Dmitri A.

doi:10.7554/elife.13292

Cited by 86 publications

(181 citation statements)

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“…but also with red-light signaling components (all five phytochromes, and COP1, etc.) in vivo (Huang et al, 2016). Interestingly, ELF3 loses its interaction with all light-signaling components in the phytochrome B (phyB) mutant background, suggesting that the phyB-ELF3 complex is one of the signaling hubs that connects red light signaling with the circadian clock.…”

Section: A Molecular Framework Of the Circadian Oscillatormentioning

confidence: 99%

“…Interestingly, ELF3 loses its interaction with all light-signaling components in the phytochrome B (phyB) mutant background, suggesting that the phyB-ELF3 complex is one of the signaling hubs that connects red light signaling with the circadian clock. (Huang et al, 2016). This type of biochemical approach is powerful for deciphering the complex network architecture of the clock protein interactome, as well as for discovering new regulators overlooked by genetic screening.…”

Section: A Molecular Framework Of the Circadian Oscillatormentioning

confidence: 99%

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Circadian Clock and Photoperiodic Flowering in Arabidopsis: CONSTANS Is a Hub for Signal Integration

2016

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Plants sense changes in day length (= photoperiod) as a reliable seasonal cue to regulate important developmental transitions such as flowering. Integration of various external light information into the circadian clock-controlled mechanisms enables plants to precisely measure photoperiod changes in the surrounding environment. The core mechanism of photoperiodic measurement is regulation of CONSTANS (CO) activity, which takes place in phloem companion cells in leaves. Until recently, it remained unclear whether plants possess specific variations of the clock for this regulation. Now it is known that a specific circadian timing mechanism in the vascular tissue is essential for photoperiodic flowering. In addition to spatial tissue-specific regulation, temporal regulation of CO activity is also important. The identification and characterization of multiple regulators that physically interact with CO and influence its function in the morning in long days are two recent advances in photoperiodic regulation of flowering time. It seems that CO acts as a network hub to integrate various external and internal signals into the photoperiodic flowering pathway. CO regulates the amount of FLOWERING LOCUS T (FT) transcripts and FT protein moves from companion cells of leaf phloem to the shoot apical meristem. The protein that helps long-distance transport of FT protein was also identified recently. Here, we introduce recent advances in tissue-specific variations of the circadian clock and the emerging picture of the intricate connections of transcriptional regulators through CO in the morning, which all facilitate plants knowing when to flower.Properly timing the floral transition is crucial for reproductive success. It can also influence the early development of offspring. To optimize this timing, plants constantly monitor changes in the surrounding environment. Among various environmental factors, observing changes in day length (= photoperiod) is the most reliable way for many organisms to know the specific time of year. Therefore, photoperiodic regulation is one of the major flowering time mechanisms and it has been studied since it was first reported in 1920 (Song et al., 2015). Arabidopsis (Arabidopsis thaliana), as it flowers mainly in spring, can sense lengthening days to induce flowering and became a suitable model to study photoperiodic flowering regulation. (Andrés and Coupland, 2012;Song et al., 2013;Pajoro et al., 2014;Shim and Imaizumi, 2015).In principle, photoperiodic flowering mechanisms can be divided into three parts: light input, circadian clock, and output. Light information is integrated into innate photoperiodic timing mechanisms governed by the circadian clock to induce genes that trigger flowering.

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Section: A Molecular Framework Of the Circadian Oscillatormentioning

confidence: 99%

Section: A Molecular Framework Of the Circadian Oscillatormentioning

confidence: 99%

Circadian Clock and Photoperiodic Flowering in Arabidopsis: CONSTANS Is a Hub for Signal Integration

2016

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“…Reaching the soil surface and the light, the young seedling has to establish a photoautotrophic lifestyle. The light is perceived by several classes of photoreceptors, which induce a signaling cascade toward photomorphogenic development (Box 1; Galvão and Fankhauser, 2015;Chen et al, 2010;Kaiserli et al, 2015;Huang et al, 2016b;Leivar and Monte, 2014;Ni et al, 2014;Pedmale et al, 2016;Dong et al, 2017;Ni et al, 2017;Pham et al, 2017;Bae and Choi, 2008;Leivar et al, 2008;Hoecker, 2017;Osterlund et al, 2000;Dong et al, 2014) that leads to extreme, organ-specific developmental changes that require local promotion (cotyledons, roots) and inhibition (hypocotyl) of growth ( Fig. 1).…”

Section: Out Of the Dark And Into The Light: Switching The Balance Frmentioning

confidence: 99%

Seedling Establishment: A Dimmer Switch-Regulated Process between Dark and Light Signaling

2017

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“…In Arabidopsis, RL prolonged phyB activity and inhibited phyB-mediated hypocotyl elongation. 16 A mutation of phytochrome-interacting factor 3 (PIF3) results in short hypocotyls under red light, indicating that RL has negative effects on light-mediated hypocotyl growth. 17,18 It seems likely that phytochrome-mediated signaling differs in soybean and cowpea pods.…”

Section: Resultsmentioning

confidence: 99%

“…In Arabidopsis, RL prolonged phyB activity and inhibited phyB-mediated hypocotyl elongation. 16 A CONTACT Yushi Ishibashi …”

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confidence: 99%

Effects of light quality on pod elongation in soybean (Glycine max (L.) Merr.) and cowpea (Vigna unguiculata (L.) Walp.)

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Nakagawa

et al. 2017

Plant Signaling & Behavior

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Effects of light quality on pod elongation in soybean (Glycine max (L.) Merr.) and cowpea (Vigna unguiculata (L.) Walp.)Seiya Tanaka a , Nobuyuki Ario a , Andressa Camila Seiko Nakagawa a , Yuki Tomita a , Naoki Murayama a , Takatoshi Taniguchi ABSTRACTSoybean pods are located at the nodes, where they are in the shadow, whereas cowpea pods are located outside of the leaves and are exposed to sunlight. To compare the effects of light quality on pod growth in soybean and cowpea, we measured the length of pods treated with white, blue, red or far-red light. In both species, pods elongated faster during the dark period than during the light period in all light treatments except red light treatment in cowpea. Red light significantly suppressed pod elongation in soybean during the dark and light periods. On the other hand, the elongation of cowpea pods treated with red light markedly promoted during the light period. These results suggested that the difference in the pod set sites between soybean and cowpea might account for the difference in their red light responses for pod growth. IntroductionPods encapsulate the developing seeds and protect them from pests and pathogens. 1 Pod length and width are positively correlated with final seed size. 2 In soybean, cultured seeds continue to grow compared with seeds in pod, which suggests that soybean seed growth is physically suppressed by the pod wall. 3 Decreasing of soybean pod size by brasinosteroid biosynthesis inhibitor resulted in reduction of 100-seed weight. 4 These data suggest that seed weight could be controlled by restriction of pod growth. However, the mechanisms of pod growth have not yet been clarified even though 100-seed weight is one of the crucial yield components in legume.Light is an important environmental signal that regulates plant growth and development. Blue light (BL), red light (RL), and far red light (FRL), which are sunlight components, regulate plant growth. Plants perceive BL via the photoreceptors cryptochromes (CRY1 and CRY2) and phototropins (phot1 and phot2), and RL and FRL via phytochromes (phyA-phyE). 5-7 Arabidopsis hypocotyl elongation is induced in the dark and is inhibited by light. 8 BL and RL suppress Arabidopsis hypocotyl growth through the CRY1 and phyB photosensory pathways, respectively. 9,10 In soybean, RL increases plant height, 11 and BL suppresses stem elongation. 12 Soybean pods are located at the nodes and receive weakened sunlight due to shading, whereas cowpea pods are located outside of the leaves and receive sunlight directly (Fig. 1). However, the effects of light on pod growth of soybean and cowpea has never been studied so far. Therefore, we investigated the effects of light quality on pod growth in these species. Results and discussionTo investigate the effects of light on pod growth in soybean and cowpea, we treated the plants with WL or monochromatic light (BL, RL or FRL). The elongation rate of soybean and cowpea pods was higher during the dark period than during the light period in all light treatments (Fi...

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PCH1 integrates circadian and light-signaling pathways to control photoperiod-responsive growth in Arabidopsis

Cited by 86 publications

References 87 publications

Circadian Clock and Photoperiodic Flowering in Arabidopsis: CONSTANS Is a Hub for Signal Integration

Circadian Clock and Photoperiodic Flowering in Arabidopsis: CONSTANS Is a Hub for Signal Integration

Seedling Establishment: A Dimmer Switch-Regulated Process between Dark and Light Signaling

Effects of light quality on pod elongation in soybean (Glycine max (L.) Merr.) and cowpea (Vigna unguiculata (L.) Walp.)

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