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| Open AccessEIN2-dependent regulation of acetylation of histone H3K14 and non-canonical histone H3K23 in ethylene signalling
The translocation of the C-terminal domain of EIN2 to the nucleus is essential for induction of gene expression in response to the plant hormone ethylene. Here, Zhang et al.show that EIN2 is required for ethylene-inducible elevation of histone acetylation marks associated with transcriptional activation.
- Fan Zhang
- , Bin Qi
- & Hong Qiao
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| Open AccessEnrichment of hydroxylated C24- and C26-acyl-chain sphingolipids mediates PIN2 apical sorting at trans-Golgi network subdomains
Sphingolipids in the trans-Golgi network have been implicated in polar trafficking. Here Wattelet-Boyer et al. show that hydroxylated C24- and C26-acyl-chain sphingolipids are enriched in trans-Golgi network subdomains that are critical for polar sorting of the PIN2 auxin carrier in plant cells.
- Valérie Wattelet-Boyer
- , Lysiane Brocard
- & Yohann Boutté
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| Open AccessThe NF-YC–RGL2 module integrates GA and ABA signalling to regulate seed germination in Arabidopsis
Crosstalk between gibberellic acid (GA) and abscisic acid (ABA) regulates seed germination. Here the authors show that NF-YC transcription factors can interact with the RGL2 DELLA protein to regulate expression of ABI5and therefore modulate ABA- and GA-responsive gene expression.
- Xu Liu
- , Pengwei Hu
- & Xingliang Hou
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| Open AccessThe Arabidopsis MIEL1 E3 ligase negatively regulates ABA signalling by promoting protein turnover of MYB96
The phytohormone abscisic acid controls plant responses to environmental stress, partly by regulating protein turnover. Here the authors propose that abscisic acid regulates seed germination by promoting degradation of the MYB96 transcription factor via the MIEL1 E3 ubiquitin (Ub) ligase.
- Hong Gil Lee
- & Pil Joon Seo
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| Open AccessRewiring of jasmonate and phytochrome B signalling uncouples plant growth-defense tradeoffs
Plant immune responses are often associated with reduced growth. Here, the authors show that combining mutations in transcriptional repressors of the defense and light perception pathways can confer both robust growth and strong herbivore defense, demonstrating that growth-defense tradeoffs can be uncoupled.
- Marcelo L. Campos
- , Yuki Yoshida
- & Gregg A. Howe
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Article
| Open AccessDELLA proteins are common components of symbiotic rhizobial and mycorrhizal signalling pathways
Symbiotic associations between legumes and nitrogen-fixing bacteria are regulated by a CCaMK-IPD3 protein complex which promotes nodule initiation. Here, Jin et al. propose that DELLA proteins positively regulate nodulation by enhancing phosphorylation of IPD3 and acting as a positive regulator of transcription.
- Yue Jin
- , Huan Liu
- & Ertao Wang
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Article
| Open AccessCrystal structure of the plant receptor-like kinase TDR in complex with the TDIF peptide
The TDF peptide interacts with the leucine-rich repeat receptor-like kinase TDR to regulate meristem differentiation in plants. Here, the authors solve the structure of the extracellular domain of TDR in complex with TDIF and propose a mechanism for TDIF recognition.
- Junko Morita
- , Kazuki Kato
- & Osamu Nureki
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Article
| Open AccessThe Arabidopsis NPF3 protein is a GA transporter
Transport of the plant hormone gibberellin is required for normal plant growth and development. Here, Tal et al. show that NPF3 is able to transport gibberellin in vitro, and provide evidence that it is required for normal gibberellin distribution and activity in plants.
- Iris Tal
- , Yi Zhang
- & Eilon Shani
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| Open AccessArabidopsis PROTEASOME REGULATOR1 is required for auxin-mediated suppression of proteasome activity and regulates auxin signalling
Plant responses to auxin require proteasome-mediated degradation of Aux/IAA transcriptional repressor proteins. Here, Yang et al. show that auxin suppresses proteasome activity in a manner dependent on the proteasome regulator PTRE1 and propose a mechanism for fine tuning Aux/IAA homoeostasis.
- Bao-Jun Yang
- , Xin-Xin Han
- & Hong-Wei Xue
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| Open AccessA coherent transcriptional feed-forward motif model for mediating auxin-sensitive PIN3 expression during lateral root development
Lateral root development is dependent on precise control of the distribution of the plant hormone auxin. Here Chen et al. propose the transcription factors ARF7 and FLP participate in a feed forward motif to mediate expression of the auxin transporter PIN3and consequently regulate lateral root development.
- Qian Chen
- , Yang Liu
- & Steffen Vanneste
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Cytokinin response factors regulate PIN-FORMED auxin transporters
The concerted action of the hormones cytokinin and auxin is an important regulator of plant development. Here Šimášková et al. propose a mechanistic basis by which cytokinin-responsive transcription factors regulate transport of auxin in Arabidopsisroots.
- Mária Šimášková
- , José Antonio O’Brien
- & Eva Benková
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An Arabidopsis PWI and RRM motif-containing protein is critical for pre-mRNA splicing and ABA responses
The phytohormone ABA plays a critical role in plant stress responses. Here, using a forward-genetic screen, Zhan et al. discover a splicing factor that plays an important role in splicing HAB1 phosphatase and fine-tuning ABA sensitivity in Arabidopsis.
- Xiangqiang Zhan
- , Bilian Qian
- & Jianhua Zhu
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ABA signalling is fine-tuned by antagonistic HAB1 variants
Protein phosphatases are central regulators of abscisic acid (ABA) signalling and stress responses in plants. Here, Wang et al. show that different splice variants of the phosphatase HAB1 antagonistically influence ABA sensitivity in Arabidopsisand propose that alternative splicing fine tunes ABA signalling.
- Zhijuan Wang
- , Hongtao Ji
- & Xia Li
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Peptidyl-prolyl isomerization targets rice Aux/IAAs for proteasomal degradation during auxin signalling
Auxin signalling requires the degradation of Aux/IAA transcriptional repressors which is mediated by their interaction with F-box proteins. Jing et al. show that in rice, OsIAA11 interaction with the F-box protein TIR1 is enhanced by cyclophilin-dependent cis/transisomerisation of the repressor.
- Hongwei Jing
- , Xiaolu Yang
- & Jianru Zuo
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| Open AccessThe jasmonate-responsive GTR1 transporter is required for gibberellin-mediated stamen development in Arabidopsis
GTR1 is known to transport glucosinolates in Arabidopsis. Here, Saito et al. show that GTR1 also transports the plant hormones jasmonate and gibberellin when heterologously expressed in Xenopus oocytes, and that gtr1mutant plants show a gibberellin-related fertility phenotype.
- Hikaru Saito
- , Takaya Oikawa
- & Hiroyuki Ohta
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| Open AccessA fluorescent hormone biosensor reveals the dynamics of jasmonate signalling in plants
Jasmonate regulates multiple aspects of plant growth, development and stress responses. Here, Larrieu et al. develop a fluorescent biosensor that allows jasmonate perception to be monitored at previously unobtainable levels of spatiotemporal resolution in Arabidopsis.
- Antoine Larrieu
- , Antony Champion
- & Laurent Laplaze
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Arabidopsis ERF109 mediates cross-talk between jasmonic acid and auxin biosynthesis during lateral root formation
Jasmonic acid induces lateral root formation in Arabidopsis by promoting auxin biosynthesis. Here, Cai et al. identify a jasmonate-induced transcription factor that regulates the expression of two auxin biosynthetic enzymes revealing a molecular mechanism for hormonal cross-talk in the root.
- Xiao-Teng Cai
- , Ping Xu
- & Cheng-Bin Xiang
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| Open AccessControl of cotton fibre elongation by a homeodomain transcription factor GhHOX3
Cotton fibre is the most important renewable material for textiles, with a huge economic output. Here the authors show that a homeodomain-leucine zipper transcription factor, GhHOX3, transduces a gibberellin signal that in turn promotes fibre cell elongation.
- Chun-Min Shan
- , Xiao-Xia Shangguan
- & Xiao-Ya Chen
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FCA mediates thermal adaptation of stem growth by attenuating auxin action in Arabidopsis
The PIF4 transcription factor promotes stem elongation by inducing auxin biosynthesis at elevated temperature in Arabidopsis. Here, Lee et al.show that the RNA-binding protein FCA attenuates PIF4 activity by promoting its dissociation from the promoter of a gene encoding an auxin biosynthetic enzyme.
- Hyo-Jun Lee
- , Jae-Hoon Jung
- & Chung-Mo Park
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Shoot-derived cytokinins systemically regulate root nodulation
Legumes regulate the number of nitrogen-fixing nodules on their roots through long-distance root–shoot communication. Here, Sasaki et al. identify shoot-derived cytokinins, produced downstream of CLE-RS1/2-HAR1 signalling, as important soluble factors limiting nodulation.
- Takema Sasaki
- , Takuya Suzaki
- & Masayoshi Kawaguchi
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Interplay between phosphorylation and SUMOylation events determines CESTA protein fate in brassinosteroid signalling
Brassinosteroid hormones control plant growth by regulating phosphorylation of a family of transcription factors. Here Khan et al.find that the stability and nuclear localization of the brassinosteroid-sensitive transcription factor CESTA is regulated by antagonistic SUMOylation and phosphorylation.
- Mamoona Khan
- , Wilfried Rozhon
- & Brigitte Poppenberger
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The Arabidopsis transcription factor bZIP11 activates auxin-mediated transcription by recruiting the histone acetylation machinery
Histone acetylation has been proposed to be crucial for the regulation of gene transcription controlled by the plant hormone auxin. Here, the authors show that the bZIP11 transcription factor activates auxin-mediated transcription by recruiting the histone acetylation machinery.
- Christoph Weiste
- & Wolfgang Dröge-Laser
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Structural basis for oligomerization of auxin transcriptional regulators
The transcriptional effects of auxin signalling are mediated by auxin response factors (ARFs) that interact with inhibitory IAA proteins. Nanao et al.present the crystal structure of domain III/IV of ARF5, revealing the structural basis for its interaction with IAAs and its potential to trigger ARF5 oligomerization.
- Max H. Nanao
- , Thomas Vinos-Poyo
- & Renaud Dumas
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Arabidopsis ABCG14 protein controls the acropetal translocation of root-synthesized cytokinins
Cytokinins are a major group of plant hormones that control plant development and some of these hormone species are translocated from roots to shoots, but how they are transported in planta is unknown. Here, ABCG14 is shown to transport cytokinins from the roots of Arabidopsisto the shoots.
- Kewei Zhang
- , Ondrej Novak
- & Chang-Jun Liu
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Auxin transport and activity regulate stomatal patterning and development
Stomata regulate gas exchange between plants and the atmosphere but whether the plant hormone auxin regulates stomatal development has not been investigated. Here, the authors reveal dynamic changes of auxin activity levels during stomatal development and show that auxin transporters are required for stomatal patterning.
- Jie Le
- , Xu-Guang Liu
- & Fred Sack
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Molecular mechanism of strigolactone perception by DWARF14
Both strigolactone and DELLA plant signalling pathways have a role in shoot branching. In this study, Nakamura et al.show that DWARF14 cleaves strigolactones creating a binding surface for the DELLA protein SLR1, thereby providing a mechanism for pathway crosstalk.
- Hidemitsu Nakamura
- , You-Lin Xue
- & Tadao Asami
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| Open AccessArabidopsis WAT1 is a vacuolar auxin transport facilitator required for auxin homoeostasis
The plant hormone auxin is essential for plant development and growth and is transported across cellular membranes via specialized transporter proteins. In this study, Ranocha et al. identify the first vacuolar auxin transporter, WAT1, suggesting an involvement of the vacuole in auxin signalling.
- Philippe Ranocha
- , Oana Dima
- & Deborah Goffner
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Auxin-Binding Protein 1 is a negative regulator of the SCFTIR1/AFB pathway
The plant hormone auxin controls growth and development, and is recognized by auxin-binding protein 1 (ABP1) and other receptors. In this study, Tromas et al.investigate the role of ABP1 and show that the protein functions upstream of other auxin receptors and controls auxin repressors via the SCF ubiquitin ligase pathway.
- Alexandre Tromas
- , Sébastien Paque
- & Catherine Perrot-Rechenmann
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S-nitrosylation of phosphotransfer proteins represses cytokinin signaling
The interaction between nitric oxide and the plant phytohormone cytokinin has a critical role in regulating adaptation growth. Here Feng et al. find that nitric oxide-mediated S-nitrosylation of a phosphotransfer protein inhibits its phosphorylation, thereby repressing cytokinin signalling.
- Jian Feng
- , Chun Wang
- & Jianru Zuo
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| Open AccessER-localized auxin transporter PIN8 regulates auxin homeostasis and male gametophyte development in Arabidopsis
Plant hormones, such as auxin, coordinate plant development. In this study, an auxin transporter—PIN8—that is expressed in the male gametophyte ofArabidopsis thaliana, is found to regulate cellular homoeostasis and maintain optimal levels of auxin for pollen development.
- Zhaojun Ding
- , Bangjun Wang
- & Jiří Friml
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| Open AccessThe Gibberellin perception system evolved to regulate a pre-existing GAMYB-mediated system during land plant evolution
Plant male reproduction is controlled by gibberellin signalling via the transcription factor GAMYB. Here, deletion of GAMYB in a moss species lacking a gibberellin signalling pathway gives rise to abnormal spores, suggesting that primitive plants used GAMYB for the control of sexual organ development.
- Koichiro Aya
- , Yuji Hiwatashi
- & Makoto Matsuoka
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| Open AccessThe NMR structure of stomagen reveals the basis of stomatal density regulation by plant peptide hormones
Stomagen is a positive regulator of stomatal development in plants, whereas epidermal patterning factors 1 and 2 are negative regulators. Ohkiet al. present the NMR structure of stomagen and show that the stomagen loop domain is sufficient to positively regulate stomatal development.
- Shinya Ohki
- , Makoto Takeuchi
- & Masashi Mori