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      Take a Trip Through the Plant and Fungal Transportome of Mycorrhiza

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      Journal: Trends in Plant Science
      Publisher: Elsevier BV

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          Sugar transporters for intercellular exchange and nutrition of pathogens.

          Li-Qing Chen, Bi-Huei Hou, Sylvie Lalonde … (2010)
          Sugar efflux transporters are essential for the maintenance of animal blood glucose levels, plant nectar production, and plant seed and pollen development. Despite broad biological importance, the identity of sugar efflux transporters has remained elusive. Using optical glucose sensors, we identified a new class of sugar transporters, named SWEETs, and show that at least six out of seventeen Arabidopsis, two out of over twenty rice and two out of seven homologues in Caenorhabditis elegans, and the single copy human protein, mediate glucose transport. Arabidopsis SWEET8 is essential for pollen viability, and the rice homologues SWEET11 and SWEET14 are specifically exploited by bacterial pathogens for virulence by means of direct binding of a bacterial effector to the SWEET promoter. Bacterial symbionts and fungal and bacterial pathogens induce the expression of different SWEET genes, indicating that the sugar efflux function of SWEET transporters is probably targeted by pathogens and symbionts for nutritional gain. The metazoan homologues may be involved in sugar efflux from intestinal, liver, epididymis and mammary cells.
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            Nitrate-regulated auxin transport by NRT1.1 defines a mechanism for nutrient sensing in plants.

            Gabriel Krouk, Benoît Lacombe, Agnieszka Bielach … (2010)
            Nitrate is both a nitrogen source for higher plants and a signal molecule regulating their development. In Arabidopsis, the NRT1.1 nitrate transporter is crucial for nitrate signaling governing root growth, and has been proposed to act as a nitrate sensor. However, the sensing mechanism is unknown. Herein we show that NRT1.1 not only transports nitrate but also facilitates uptake of the phytohormone auxin. Moreover, nitrate inhibits NRT1.1-dependent auxin uptake, suggesting that transduction of nitrate signal by NRT1.1 is associated with a modification of auxin transport. Among other effects, auxin stimulates lateral root development. Mutation of NRT1.1 enhances both auxin accumulation in lateral roots and growth of these roots at low, but not high, nitrate concentration. Thus, we propose that NRT1.1 represses lateral root growth at low nitrate availability by promoting basipetal auxin transport out of these roots. This defines a mechanism connecting nutrient and hormone signaling during organ development. Copyright 2010 Elsevier Inc. All rights reserved.
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              Plant aquaporins: membrane channels with multiple integrated functions.

              Christophe Maurel, Lionel Verdoucq, Doan-Trung Luu … (2008)
              Aquaporins are channel proteins present in the plasma and intracellular membranes of plant cells, where they facilitate the transport of water and/or small neutral solutes (urea, boric acid, silicic acid) or gases (ammonia, carbon dioxide). Recent progress was made in understanding the molecular bases of aquaporin transport selectivity and gating. The present review examines how a wide range of selectivity profiles and regulation properties allows aquaporins to be integrated in numerous functions, throughout plant development, and during adaptations to variable living conditions. Although they play a central role in water relations of roots, leaves, seeds, and flowers, aquaporins have also been linked to plant mineral nutrition and carbon and nitrogen fixation.
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                Author and article information

                Journal
                Title: Trends in Plant Science
                Abbreviated Title: Trends in Plant Science
                Publisher: Elsevier BV
                ISSN (Print): 13601385
                Publication date Created: November 2016
                Publication date (Print): November 2016
                Volume: 21
                Issue: 11
                Pages: 937-950
                Article
                DOI: 10.1016/j.tplants.2016.07.010
                PubMed ID: 27514454
                SO-VID: 452d1ad8-0de2-49cd-a76e-015e92504ac3
                Copyright © © 2016
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