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| Open AccessStructural basis for high selectivity of a rice silicon channel Lsi1
The rice Lsi1 aquaporin mediates uptake of silicic acid via the roots. Here the authors show the crystal structure of rice Lsi1 and characterize a unique five residue hydrophilic selectivity filter providing a structural basis for the highly selective activity of Lsi1 in Si uptake.
- Yasunori Saitoh
- , Namiki Mitani-Ueno
- & Michihiro Suga
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Article
| Open AccessStructure and function of an Arabidopsis thaliana sulfate transporter
Plant sulfate transporters mediate absorption and distribution of sulfate. Here the authors present functional assays and a cryo-EM structure of the Arabidopsis SULTR4;1 transporter identifying key domains for dimerization, substrate binding and coupling of transport activity to a proton gradient.
- Lie Wang
- , Kehan Chen
- & Ming Zhou
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| Open AccessGABA signalling modulates stomatal opening to enhance plant water use efficiency and drought resilience
GABA accumulates during stress in plants but how, where and when GABA acts is not clear. Here the authors show that GABA production in Arabidopsis guard cells reduces stomatal opening and transpirational water loss, thereby improving water use efficiency.
- Bo Xu
- , Yu Long
- & Matthew Gilliham
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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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| Open AccessAtSWEET13 and AtSWEET14 regulate gibberellin-mediated physiological processes
SWEET proteins are known to function as sugar transporters. Here, Kannoet al. show that Arabidopsis SWEET13 and SWEET14 are also able to transport the plant hormone gibberellin (GA) in heterologous systems and that sweetmutants display phenotypes consistent with altered GA response.
- Yuri Kanno
- , Takaya Oikawa
- & Mitsunori Seo
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| Open AccessThe Arabidopsis Golgi-localized GDP-L-fucose transporter is required for plant development
Nucleotide sugars are transported from the cytoplasm to the Golgi lumen where they are incorporated into cell wall polysaccharides and used for glycosylation of proteins and lipids. Here the authors identify GFT1, an ArabidopsisGolgi-localized GDP-fucose transporter that is required for plant growth and development
- Carsten Rautengarten
- , Berit Ebert
- & Joshua L. Heazlewood
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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 AccessIdentification of a plastidial phenylalanine exporter that influences flux distribution through the phenylalanine biosynthetic network
Phenylalanine is synthesized in plant chloroplasts and is then exported to the cytosol, where it is a precursor for various secondary metabolites. Here, the authors identify PhpCAT as a plastid phenylalanine transporter required to maintain metabolic flux in petunia.
- Joshua R. Widhalm
- , Michael Gutensohn
- & Natalia Dudareva
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Article
| Open AccessAbscisic acid transporters cooperate to control seed germination
Seed germination is repressed by release of the plant hormone abscisic acid (ABA) to the embryo from the surrounding endosperm tissue. Here Kang et al. characterize four different ABA transporters and propose that they act in concert to control ABA release and regulate germination.
- Joohyun Kang
- , Sojeong Yim
- & Youngsook Lee
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| Open AccessGABA signalling modulates plant growth by directly regulating the activity of plant-specific anion transporters
GABA is an important neurotransmitter in animals, and while it accumulates in plants under stress, its potential role in plant signalling was poorly understood. Here, Rameshet al. show that GABA rapidly alters the activity of plant ALMT anion channels modifying root growth and stress tolerance.
- Sunita A. Ramesh
- , Stephen D. Tyerman
- & Matthew Gilliham
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Article
| Open AccessAtPHT4;4 is a chloroplast-localized ascorbate transporter in Arabidopsis
In plants, ascorbate is synthesized in the mitochondria yet plays essential roles as an antioxidant in the chloroplast. Here, Miyaji et al.show that AtPHT4;4 is a chloroplast envelope ascorbate transporter and suggest it is required for dissipation of excess energy under light stress.
- Takaaki Miyaji
- , Takashi Kuromori
- & Yoshinori Moriyama
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Article |
CHOLINE TRANSPORTER-LIKE1 is required for sieve plate development to mediate long-distance cell-to-cell communication
Phloem is responsible for long-distance transport of molecules in plants and conducting phloem cells are joined by sieve areas that facilitate cell-to-cell transport. Here the authors identify mutations in the gene encoding CHOLINE TRANSPORTER-LIKE1 that cause abnormalities in sieve areas and impaired phloem conduction.
- Jan Dettmer
- , Robertas Ursache
- & Ykä Helariutta
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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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Article
| 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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| 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 rice mitochondrial iron transporter is essential for plant growth
Increasing the nutritional content of plant crops and the identification of iron transporters in rice would facilitate the improvement of rice varieties. In this study, the authors identify a mitochondrial iron transporter in rice — MIT — and suggest that this gene is important for rice growth and development.
- Khurram Bashir
- , Yasuhiro Ishimaru
- & Naoko K. Nishizawa