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| Open AccessA phyB-PIF1-SPA1 kinase regulatory complex promotes photomorphogenesis in Arabidopsis
SPA proteins repress plant photomorphogenesis by promoting the E3 ligase activity of COP1. Here the authors show that SPAs also act as serine/threonine kinase and are required for phyB-mediated light-dependent phosphorylation and degradation of the PIF1 transcription factor.
- Inyup Paik
- , Fulu Chen
- & Enamul Huq
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Article
| Open AccessBES1 is activated by EMS1-TPD1-SERK1/2-mediated signaling to control tapetum development in Arabidopsis thaliana
BES1 and BZR1 transcription factors are activated by the BRI1-BAK1 receptor complex during brassinosteroid signaling. Here the authors show that BES1-family members also act in anthers, downstream of another receptor-like kinase-mediated signaling pathway, EMS1-TPD1-SERK1/2, to promote tapetum development.
- Weiyue Chen
- , Minghui Lv
- & Jia Li
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Article
| Open AccessEMS1 and BRI1 control separate biological processes via extracellular domain diversity and intracellular domain conservation
EMS1 is a receptor-like kinase that recognizes the peptide ligand TPD1 to specify tapeta in Arabidopsis. Here, via a reciprocal complementation approach, the authors provide evidence that intracellular signaling by EMS1 is interchangeable with that of the brassinosteroid receptor BRI1.
- Bowen Zheng
- , Qunwei Bai
- & Guang Wu
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Article
| Open AccessEthylene-mediated nitric oxide depletion pre-adapts plants to hypoxia stress
Plant hypoxia responses are controlled by oxygen and nitric oxide (NO)-dependent proteolysis of ERFVII transcription factors. Here Hartman et al. show that passive ethylene entrapment during root submergence enhances NO-scavenger PHYTOGLOBIN1, ERFVII stability and promotes subsequent hypoxia tolerance.
- Sjon Hartman
- , Zeguang Liu
- & Laurentius A. C. J. Voesenek
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Article
| Open AccessCytokinin functions as an asymmetric and anti-gravitropic signal in lateral roots
Lateral roots emerge from the primary root at right angles but briefly grow asymmetrically to set a distinct growth angle. Here Waidmann et al. show that cytokinin acts as an anti-gravitropic signal that impairs growth on the upper side of emerged lateral roots to promote radial expansion of the root system.
- Sascha Waidmann
- , Michel Ruiz Rosquete
- & Jürgen Kleine-Vehn
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Article
| Open AccessSHB1 and CCA1 interaction desensitizes light responses and enhances thermomorphogenesis
The PIF4 transcription factor promotes adaptation to elevated temperature but is degraded under red light to trigger photomorphogenesis. Here Sun et al. show that the core circadian component CCA1 recruits SHB1 to sustain PIF4 expression after dawn to balance thermomorphogenesis and light responses.
- Qingbin Sun
- , Shulei Wang
- & Min Ni
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Article
| Open AccessOrthogonal regulation of phytochrome B abundance by stress-specific plastidial retrograde signaling metabolite
MEcPP is an evolutionarily conserved metabolite that acts as a plastid-to-nucleus retrograde signal to regulate adaptive responses to fluctuating light. Here the authors show that MEcPP regulates seedling development by stabilizing the phyB photoreceptor in an auxin and Ca2+ dependent manner.
- Jishan Jiang
- , Liping Zeng
- & Katayoon Dehesh
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Article
| Open AccessSLR1 inhibits MOC1 degradation to coordinate tiller number and plant height in rice
Due to reduced gibberellin sensitivity, modern rice cultivars are shorter than traditional varieties but produce more tillers and have higher yields. Here Liao et al. show that gibberellin contributes to decreased tiller number by degrading the MOC1 protein that suppresses bud outgrowth.
- Zhigang Liao
- , Hong Yu
- & Jiayang Li
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Article
| Open AccessVoltage-dependent gating of SV channel TPC1 confers vacuole excitability
Electrical excitability in animals and plants is associated with voltage-gated Shaker-type K+ channels at the plasma membrane. Here, Jaślan et al. show that electrical excitability of the central organelle of plant cells, the vacuole, is based on the action of Ca2+-activated and K+-conducting TPC1 and TPK channels.
- Dawid Jaślan
- , Ingo Dreyer
- & Rainer Hedrich
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Article
| Open AccessNCP activates chloroplast transcription by controlling phytochrome-dependent dual nuclear and plastidial switches
Phytochrome signaling in the nucleus can activate expression of photosynthesis-associated genes in plastids. Here Yang et al. show that NCP is a dual-targeted protein that promotes phytochrome B localization to photobodies in the nucleus while facilitating PEP polymerase assembly in the plastids.
- Emily J. Yang
- , Chan Yul Yoo
- & Meng Chen
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Article
| Open AccessMYB96 recruits the HDA15 protein to suppress negative regulators of ABA signaling in Arabidopsis
MYB96 can regulate both positive and negative regulators of ABA signaling to maximize plant drought tolerance. Here, the authors show that MYB96 represses expression of ABA negative regulators in Arabidopsis by interacting with HDA15 and promoting histone deacetylation at the cognate regions.
- Hong Gil Lee
- & Pil Joon Seo
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Article
| Open AccessNetwork Walking charts transcriptional dynamics of nitrogen signaling by integrating validated and predicted genome-wide interactions
Temporal control of transcriptional networks enables organisms to adapt to changing environment. Here, the authors use a scaled-up cell-based assay to identify direct targets of nitrogen-early responsive transcription factors and validate a network path mediating dynamic nitrogen signaling in Arabidopsis.
- Matthew D. Brooks
- , Jacopo Cirrone
- & Gloria M. Coruzzi
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Article
| Open AccessWater impacts nutrient dose responses genome-wide to affect crop production
Scarcity of water and nutrients limit crop yields. Here Swift et al. show that gene expression in rice responds differently to changes in the absolute amount of nitrogen available compared to nitrogen concentration and identify expression profiles associated with crop performance in arid, low-nutrient soils.
- Joseph Swift
- , Mark Adame
- & Gloria M. Coruzzi
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Article
| Open AccessThe apocarotenoid metabolite zaxinone regulates growth and strigolactone biosynthesis in rice
Strigolactone and abscisic acid are carotenoid-derived plant hormones. Here the authors describe the identification of zaxinone, a further apocarotenoid metabolite, which down-regulates strigolactone content and is required for normal growth and development in rice.
- Jian You Wang
- , Imran Haider
- & Salim Al-Babili
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Article
| Open AccessStrigolactone perception and deactivation by a hydrolase receptor DWARF14
Cleavage of strigolactone by the D14 receptor was assumed to produce an active intermediate that promotes signaling. Here the authors show that D14 activity is not dependent on cleavage activity and propose a new model whereby ligand hydrolysis serves to deactivate strigolactone signaling.
- Yoshiya Seto
- , Rei Yasui
- & Shinjiro Yamaguchi
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Article
| Open AccessOxygen-dependent proteolysis regulates the stability of angiosperm polycomb repressive complex 2 subunit VERNALIZATION 2
VRN2 is a Polycomb Repressive Complex 2 subunit, best known as a regulator of vernalization that accumulates during prolonged cold. Here Gibbs et al. show that VRN2 is degraded via the N-end rule pathway, which prevents ectopic accumulation of VRN2 in the absence of appropriate environmental stimuli.
- Daniel J. Gibbs
- , Hannah M. Tedds
- & Michael J. Holdsworth
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Article
| Open AccessArabidopsis AGDP1 links H3K9me2 to DNA methylation in heterochromatin
DNA methylation and H3K9 dimethylation are two linked epigenetic marks of silenced chromatin in plants that depend on the activity of CMT3/2 and SUVH4/5/6. Here the authors identify AGDP1 as an H3K9me2-binding protein required for heterochromatic non-CG DNA methylation, H3K9 dimethylation, and transcriptional silencing.
- Cuijun Zhang
- , Xuan Du
- & Jian-Kang Zhu
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Article
| Open AccessThe DNA binding landscape of the maize AUXIN RESPONSE FACTOR family
AUXIN RESPONSE FACTORS (ARFs) are a family of plant-specific transcriptional factors involved in auxin signaling. Here, the authors adapt DAP-seq technology to show the binding landscape of 14 maize ARFs and reveal class-specific binding properties and transcriptional coordination by ARFs from different classes.
- Mary Galli
- , Arjun Khakhar
- & Andrea Gallavotti
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Article
| Open AccessA genetic network mediating the control of bud break in hybrid aspen
Molecular mechanism of how temperature-mediated control of bud break in perennial plants remains unclear. Here, the author show that transcriptional factor SHORT VEGETATIVE PHASE-LIKE and its downstream target TCP18 are negative regulators of hybrid aspen bud break.
- Rajesh Kumar Singh
- , Jay P. Maurya
- & Rishikesh P. Bhalerao
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Article
| Open AccessInterplay of the two ancient metabolites auxin and MEcPP regulates adaptive growth
MEcPP is an evolutionarily conserved plastidial metabolite functioning as a retrograde signal to the nucleus in response to environmental stresses. Here Jiang et al. show that MEcPP can reduce the abundance of auxin and an auxin transporter, providing a mechanistic link between plastids and adaptive growth responses.
- Jishan Jiang
- , Cecilia Rodriguez-Furlan
- & Katayoon Dehesh
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Article
| Open AccessControl of seed dormancy and germination by DOG1-AHG1 PP2C phosphatase complex via binding to heme
The hormone abscisic acid (ABA) prevents seeds from germination when conditions are not suitable. Here the authors show that DOG1, a positive regulator of germination, impairs ABA signaling via genetic and physical interactions with the AHG1 phosphatase and that DOG1 binding to heme is required for this activity.
- Noriyuki Nishimura
- , Wataru Tsuchiya
- & Toshimasa Yamazaki
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Article
| Open AccessBRI1 and BAK1 interact with G proteins and regulate sugar-responsive growth and development in Arabidopsis
G-proteins regulate sugar-responsive growth in plants. Here the authors show that brassinosteroid (BR) signaling is also involved in sugar responses and present evidence that the BR receptor BRI1 and its co-receptor BAK1 can phosphorylate G-protein subunits to regulate sugar signaling in Arabidopsis.
- Yuancheng Peng
- , Liangliang Chen
- & Yunhai Li
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Article
| Open AccessA NIGT1-centred transcriptional cascade regulates nitrate signalling and incorporates phosphorus starvation signals in Arabidopsis
Plants respond to nutrients by modulating gene expression. Here, the authors show that nitrate suppresses NRT2.1 nitrate transporter expression via NIGT1 transcriptional repressors and that phosphate starvation enhances this pathway via PHR1, thus linking phosphorus and nitrogen signalling.
- Yoshie Maeda
- , Mineko Konishi
- & Shuichi Yanagisawa
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Article
| Open AccessHydrogen peroxide positively regulates brassinosteroid signaling through oxidation of the BRASSINAZOLE-RESISTANT1 transcription factor
Hydrogen peroxide and brassinosteroids (BR) both regulate plant development and stress responses. Here Tian et al. show that hydrogen peroxide can trigger oxidation of the BR-responsive BZR1 transcription factor and promote its transcriptional activity, thereby linking BR and redox signaling.
- Yanchen Tian
- , Min Fan
- & Ming-Yi Bai
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Article
| Open AccessLeucine-rich repeat receptor-like gene screen reveals that Nicotiana RXEG1 regulates glycoside hydrolase 12 MAMP detection
The role of most plant leucine-rich repeat (LRR) receptors in innate immunity is unknown. Here, the authors develop virus-based constructs to silence LRR receptor-like genes in the Nicotiana benthamiana genome and identify Response to XEG1 that specifically recognizes the glycoside hydrolase 12 protein XEG1.
- Yan Wang
- , Yuanpeng Xu
- & Yuanchao Wang
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Article
| Open AccessExtracellular ATP elicits DORN1-mediated RBOHD phosphorylation to regulate stomatal aperture
Extracellular ATP acts as a damage-associated molecular pattern that triggers signaling responses to wounding and environmental stimuli in plants. Here Chen et al. show that ATP perception by DORN1 can trigger stomatal closure mediated via RBOHD phosphorylation and ROS production.
- Dongqin Chen
- , Yangrong Cao
- & Gary Stacey
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Article
| Open AccessPCH1 and PCHL promote photomorphogenesis in plants by controlling phytochrome B dark reversion
Dark reversion of the red-light receptor phytochrome B (phyB) converts the receptor to the inactive state. Here, Enderle et al. show that PCH1 and PCHL bind phyB and suppress dark reversion, and that far-red and blue-light induced upregulation of PCH1 and PCHL increases red light sensitivity in Arabidopsis.
- Beatrix Enderle
- , David J. Sheerin
- & Andreas Hiltbrunner
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Article
| Open AccessFunctional reduction in pollination through herbivore-induced pollinator limitation and its potential in mutualist communities
Herbivory-induced volatile organic compounds reduce pollinator visits to plants. Here, Glaum and Kessler show that despite reducing individual fitness, herbivore-induced changes can indirectly benefit overall community resilience, explaining species persistence in antagonized mutualistic communities.
- Paul Glaum
- & André Kessler
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Article
| Open AccessMechanism of early light signaling by the carboxy-terminal output module of Arabidopsis phytochrome B
Plant phytochromes mediate the degradation of PIF transcription factors to transduce light signaling. Here, contrary to previous models, Qiu et al. show that degradation of PIF3 does not require the N-terminal photosensory module of PHYB but can instead be mediated by the C-terminal output module.
- Yongjian Qiu
- , Elise K. Pasoreck
- & Meng Chen
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Article
| Open AccessAntagonistic bacteria disrupt calcium homeostasis and immobilize algal cells
Predatory or competitive interactions between microbes are poorly understood but likely influence global nutrient cycles. Here, the authors show that Pseudomonas bacteria could immobilize algal cells, potential prey, by releasing secondary metabolites that induce a Ca2+ signal and algal deflagellation.
- Prasad Aiyar
- , Daniel Schaeme
- & Maria Mittag
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Article
| Open AccessBlue light and CO2 signals converge to regulate light-induced stomatal opening
Stomata open in response to low CO2 conditions in the light to maximise photosynthesis. Here, Hiyama et al. identify two kinases that promote stomatal opening by inhibiting S-type anion channels downstream of phototropin and HT1 thereby acting as a convergence point for blue light and CO2 signaling.
- Asami Hiyama
- , Atsushi Takemiya
- & Ken-ichiro Shimazaki
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Article
| Open AccessRETRACTED ARTICLE: Sulfur availability regulates plant growth via glucose-TOR signaling
Plants lack the amino acid sensors that regulate TOR in metazoans. Here Dong et al. show that Arabidopsis GCN2 senses carbon and nitrogen availability for cysteine synthesis while sulfur limitation activates TOR via glucose metabolism, providing a mechanism whereby plants control growth according to nutrient availability.
- Yihan Dong
- , Marleen Silbermann
- & Markus Wirtz
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Article
| Open AccessA mechanosensitive Ca2+ channel activity is dependent on the developmental regulator DEK1
A rise in cytoplasmic Ca2+ concentration is a well-described response of plant cells to mechanical stimulation. Here the authors show that the DEK1 protein, which is essential for epidermis specification and development in plants, is required for triggering a mechanically-activated Ca2+ channel.
- Daniel Tran
- , Roberta Galletti
- & Gwyneth C. Ingram
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Article
| Open AccessTyrosine phosphorylation of the GARU E3 ubiquitin ligase promotes gibberellin signalling by preventing GID1 degradation
Plants respond to gibberellins via GID1-dependent degradation of DELLA proteins. Here, Nemoto et al. show that the gibberellin response is positively regulated by tyrosine phosphorylation of GARU, an E3 ubiquitin ligase that mediates degradation of GID1.
- Keiichirou Nemoto
- , Abdelaziz Ramadan
- & Tatsuya Sawasaki
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Article
| Open AccessControl of chrysanthemum flowering through integration with an aging pathway
The mechanisms by which plant age regulates flowering remain incompletely understood. Here the authors show that age dependent regulation of SPL transcription factors by miR156 influence flowering via control of NF-YB8 expression in Chrysanthemum.
- Qian Wei
- , Chao Ma
- & Junping Gao
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Article
| Open AccessBrassinosteroid signaling-dependent root responses to prolonged elevated ambient temperature
Moderate heat stimulates the growth of Arabidopsis shoots in an auxin-dependent manner. Here, Martins et al. show that elevated ambient temperature modifies root growth by reducing the BRI1 brassinosteroid-receptor protein level and downregulating brassinosteroid signaling.
- Sara Martins
- , Alvaro Montiel-Jorda
- & Grégory Vert
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Article
| Open AccessPhotosynthesis-dependent H2O2 transfer from chloroplasts to nuclei provides a high-light signalling mechanism
Multiple plastid-derived signals have been proposed but not shown to move to the nucleus to promote plant acclimation to fluctuating light. Here the authors use a fluorescent hydrogen peroxide sensor to provide evidence that H2O2 is transferred directly from chloroplasts to nuclei to control nuclear gene expression.
- Marino Exposito-Rodriguez
- , Pierre Philippe Laissue
- & Philip M. Mullineaux
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Article
| Open AccessDifferential regulation of the Epr3 receptor coordinates membrane-restricted rhizobial colonization of root nodule primordia
TheLotus japonicus LysM receptor kinase EPR3 perceives rhizobial exopolysaccharides to initiate infection of the root epidermis. Here the authors show that EPR3 also mediates infection thread progression in the root cortex and show that key transcription factors that regulate symbiosis specify the expression of Epr3.
- Yasuyuki Kawaharada
- , Mette W. Nielsen
- & Jens Stougaard
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Article
| Open AccessCryptic bioactivity capacitated by synthetic hybrid plant peptides
Peptide hormones play versatile roles in plant development and environmental responses. Here the authors report the engineering of a synthetic plant peptide that acts on meristems through interaction with both the CLV1 and TDR/PXY receptors ofArabidopsis thaliana.
- Yuki Hirakawa
- , Hidefumi Shinohara
- & Naoyuki Uchida
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Article
| Open AccessTOC1–PIF4 interaction mediates the circadian gating of thermoresponsive growth in Arabidopsis
The PIF4 transcription factor mediates the response of Arabidopsis seedlings to elevated temperature. Here the authors show that PIF4 interacts with the circadian clock component TOC1 which acts to suppress the PIF4-mediated temperature response in the evening.
- Jia-Ying Zhu
- , Eunkyoo Oh
- & Zhi-Yong Wang
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Article
| Open AccessNIN-like protein 8 is a master regulator of nitrate-promoted seed germination in Arabidopsis
Nitrate stimulates seed germination in many plant species. Here, Yan et al. show that the Arabidopsistranscription factor NIN-like protein 8 is required to stimulate germination in response to nitrate and induces expression of an enzyme involved in ABA catabolism.
- Dawei Yan
- , Vanathy Easwaran
- & Eiji Nambara
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Article
| 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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Article
| 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 AccessPhytochrome B and REVEILLE1/2-mediated signalling controls seed dormancy and germination in Arabidopsis
Seed dormancy prevents germination under adverse environmental conditions. Here the authors show that the RVE1 and RVE2 transcription factors suppress biosynthesis of the germination-promoting hormone GA and act downstream of phytochrome signalling to promote dormancy and repress light-induced germination.
- Zhimin Jiang
- , Gang Xu
- & Rongcheng Lin
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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 AccessPlastid-nucleus communication involves calcium-modulated MAPK signalling
Retrograde signalling co-ordinates nuclear gene expression in response to stress perceived in the chloroplast. Here Guo et al. show that a MAPK cascade acting downstream of a plastid derived Ca2+signal contributes to the regulation of nuclear gene expression by phosphorylation of ABI4 during retrograde signalling.
- Hailong Guo
- , Peiqiang Feng
- & Lixin Zhang
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Article
| Open AccessCalredoxin represents a novel type of calcium-dependent sensor-responder connected to redox regulation in the chloroplast
Calcium and redox signalling have important roles in acclimation processes. Here, the authors characterise a protein from Chlamydomonas reinhardtiithat can integrate calcium and redox-related signalling.
- Ana Karina Hochmal
- , Karen Zinzius
- & Michael Hippler
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Article
| Open AccessDELLA-mediated PIF degradation contributes to coordination of light and gibberellin signalling in Arabidopsis
Gibberellins (GA) negatively regulate light-mediated suppression of hypocotyl elongation in plants. Here, Li et al. show that GA-mediated destabilization of DELLA proteins promotes accumulation of the light-regulated PIF transcription factors thus contributing to the crosstalk between light and GA signalling.
- Kunlun Li
- , Renbo Yu
- & Xing Wang Deng
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Article
| Open AccessA voltage-dependent chloride channel fine-tunes photosynthesis in plants
Plants have evolved to maximize energy capture while protecting their photosynthetic machinery in response to rapid variation in light conditions. Here, the authors describe a chloroplast voltage-dependent anion channel that contributes to photoprotection by fine-tuning the ion balance across the thylakoid membrane.
- Andrei Herdean
- , Enrico Teardo
- & Björn Lundin