Plant Aquaporins: Roles in Plant Physiology.

Biochimie et Physiologie Moléculaire des Plantes, UMR 5004 CNRS/UMR 0386 INRA/Montpellier SupAgro/Université Montpellier 2, F-34060 Montpellier Cedex 2, France.
Biochimica et Biophysica Acta (Impact Factor: 4.66). 11/2013; 1840(5). DOI: 10.1016/j.bbagen.2013.11.004
Source: PubMed


Aquaporins are membrane channels that facilitate the transport of water and small neutral molecules across biological membranes of most living organisms.
Here, we present comprehensive insights made on plant aquaporins in recent years, pointing to their molecular and physiological specificities with respect to animal or microbial counterparts.
In plants, aquaporins occur as multiple isoforms reflecting a high diversity of cellular localizations and various physiological substrates in addition to water. Of particular relevance for plants is the transport by aquaporins of dissolved gases such as carbon dioxide or metalloids such as boric or silicic acid. The mechanisms that determine the gating and subcellular localization of plant aquaporins are extensively studied. They allow aquaporin regulation in response to multiple environmental and hormonal stimuli. Thus, aquaporins play key roles in hydraulic regulation and nutrient transport in roots and leaves. They contribute to several plant growth and developmental processes such as seed germination or emergence of lateral roots.
Plants with genetically altered aquaporin functions are now tested for their ability to improve plant tolerance to stresses. This article is part of a Special Issue entitled Aquaporins.

Download full-text


Available from: Guowei Li, Oct 25, 2014
  • Source
    • "Possibly these signals emerge from developing fruit. Plant water channels, aquaporins (AQPs), are understood to play significant roles in controlling plant water status, hydraulic conductivity, membrane osmotic permeability and stomatal regulation (Kaldenhoff et al. 2007, Shatil-Cohen et al. 2011, Prado and Maurel 2013, Li et al. 2014, Moshelion et al. 2015). Aquaporins are subject to rapid, substantial and stable shoot-to-root signals, regulating root hydraulic conductivity (Vandeleur et al. 2014). "
    [Show abstract] [Hide abstract]
    ABSTRACT: We tested the hypothesis that whole-tree water consumption of olives (Olea europaea L.) is fruit load-dependent and investigated the driving physiological mechanisms. Fruit load was manipulated in mature olives grown in weighing-drainage lysimeters. Fruit was thinned or entirely removed from trees at three separate stages of growth: early, mid and late in the season. Tree-scale transpiration, calculated from lysimeter water balance, was found to be a function of fruit load, canopy size and weather conditions. Fruit removal caused an immediate decline in water consumption, measured as whole-plant transpiration normalized to tree size, which persisted until the end of the season. The later the execution of fruit removal, the greater was the response. The amount of water transpired by a fruit-loaded tree was found to be roughly 30% greater than that of an equivalent low- or nonyielding tree. The tree-scale response to fruit was reflected in stem water potential but was not mirrored in leaf-scale physiological measurements of stomatal conductance or photosynthesis. Trees with low or no fruit load had higher vegetative growth rates. However, no significant difference was observed in the overall aboveground dry biomass among groups, when fruit was included. This case, where carbon sources and sinks were both not limiting, suggests that the role of fruit on water consumption involves signaling and alterations in hydraulic properties of vascular tissues and tree organs.
    Full-text · Article · Jan 2016 · Tree Physiology
  • Source
    • "shown to be particularly relevant in the transport of metalloids, including As(III) (Li et al. 2014, Mukhopadhyay et al. 2014). "
    [Show abstract] [Hide abstract]
    ABSTRACT: Arsenic (As) is a highly toxic metalloid that is classified as a non-threshold class-1 carcinogen. Millions of people worldwide suffer from As toxicity due to the intake of As-contaminated drinking water and food. Reducing the As concentration in drinking water and food is thus of critical importance. Phytoremediation of soil contaminated with As and the reduction of As contamination in food depend on a detailed understanding of As uptake and transport in plants. As transporters play essential roles in As uptake, translocation and accumulation in plant cells. In this review, we summarize the current understanding of As transport in plants, with an emphasis on As uptake, mechanisms of As resistance and the long-distance translocation of As, especially the accumulation of As in grains through phloem-mediated transport.
    Full-text · Article · Oct 2015 · Plant and Cell Physiology
  • Source
    • "The aim of this review is to provide a brief summary of such diversity. It is not intended to give a comprehensive review of aquaporin structural biology and physiology, since these aspects have recently been reviewed elsewhere (Abascal et al., 2014; Ahmadpour et al., 2014; Bienert and Chaumont, 2014; Day et al., 2014; Ishibashi et al., 2014; Kaldenhoff et al., 2014; Li et al., 2014; Mukhopadhyay et al., 2014; Song et al., 2014; Tani and Fujiyoshi, 2014). Therefore, we present a short overview of the structure and function of aquaporins, and include a section on prokaryotic aquaporins Received 15 April 2015; accepted 16 July 2015. "
    [Show abstract] [Hide abstract]
    ABSTRACT: In this review, we provide a brief synopsis of the evolution and functional diversity of the aquaporin gene superfamily in prokaryotic and eukaryotic organisms. Based upon the latest data, we discuss the expanding list of molecules shown to permeate the central pore of aquaporins, and the unexpected diversity of water channel genes in Archaea and Bacteria. We further provide new insight into the origin by horizontal gene transfer of plant glycerol-transporting aquaporins (NIPs), and the functional co-option and gene replacement of insect glycerol transporters. Finally, we discuss the origins of four major grades of aquaporins in Eukaryota, together with the increasing repertoires of aquaporins in vertebrates. © 2015 Marine Biological Laboratory.
    Full-text · Article · Aug 2015 · Biological Bulletin
Show more