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Molecular physiology of aquaporins in plants

Molecular physiology of aquaporins in plants,10.1016/S0074-7696(02)15007-8,International Review of Cytology-a Survey of Cell Biology,C. Maurel,H. Javo

Molecular physiology of aquaporins in plants   (Citations: 76)
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In plants, membrane channels of the major intrinsic protein (MIP) super-family exhibit a high diversity with, for instance, 35 homologues in the model species Arabidopsis thaliana. As has been found in other organisms, plant MIPs function as membrane channels permeable to water (aquaporins) and in some cases to small nonelectrolytes. The aim of the present article is to integrate into plant physiology what has been recently learned about the molecular and functional properties of aquaporins in plants. Exhaustive compilation of data in the literature shows that the numerous aquaporin isoforms of plants have specific expression patterns throughout plant development and in response to environmental stimuli. The diversity of aquaporin homologues in plants can also be explained in part by their presence in multiple subcellular compartments. In recent years, there have been numerous reports that describe the activity of water channels in purified membrane vesicles, in isolated organelles or protoplasts, and in intact plant cells or even tissues. Altogether, these data suggest that the transport of water and solutes across plant membranes concerns many facets of plant physiology. Because of the high degree of compartmentation of plant cells, aquaporins may play a critical role in cell osmoregulation. Water uptake in roots represents a typical process in which to investigate the role of aquaporins in transcellular water transport, and the mechanisms and regulations involved are discussed.
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    • ...Subsequently, thirteen aquaporin paralogs (AQP0-12) have been identified in mammals [1], and up to 38 MIP-related sequences, divided into four types, plasma membrane intrinsic proteins (PIPs), tonoplast intrinsic proteins (TIPs), small and basic intrinsic proteins (SIPs) and nodulin 26-like intrinsic proteins (NIPs), have been documented in plants [4-6]...

    Angèle Tingaud-Sequeiraet al. The zebrafish genome encodes the largest vertebrate repertoire of func...

    • ...In plant cells, PIP and TIP aquaporins predominate and most transcellular and intracellular water flows occur through them [2, 3]. The third subfamily contains nodulin�like membrane proteins (NIP, from N odulin Intrinsic Pro� teins); their name originated from aquaporin of the peribacteroid membrane in symbiotic nitrogen�fixing nodules on legume roots, but they were detected also in other plants [4]...

    N. V. Obrouchevaet al. Aquaporins and cell growth

    • ...Expression studies, as well as studies using AQP inhibitors such as mercurial compounds, have indicated that AQPs fulfil two main functions in plants, namely cell osmoregulation and control of transcellular water flow (Tyerman et al. 1999; Maurel et al. 2002)...
    • ...It is generally assumed that the high water permeability of the tonoplast allows the vacuole to buffer the cytoplasm in case of an intense water flow, thus providing an efficient means to dissipate any osmotic gradient across this membrane and to prevent any cellular damages caused by a sudden change in cytoplasmic volume (Barrieu et al. 1999; Maurel et al. 2002; Tyerman et al. 2002)...
    • ...It has been reported that a very efficient cytosol osmoregulation can occur as long as the tonoplast has a C5-fold higher osmotic water permeability than the plasma membrane (Maurel et al. 2002)...

    Azeez Beeboet al. Life with and without AtTIP1;1, an Arabidopsis aquaporin preferentiall...

    • ...The function of MIPs is regulated by factors including phosphorylation, cytosolic pH, and abiotic stress (reviewed in Maurel et al. 2002; Chaumont et al. 2005), and specific Ser residues involved in phosphorylation (Johnson and Chrispeels 1992; Johansson et al. 1998; Törnroth-Horsefield et al. 2006 )a nd aH is involved in response to cytosolic pH (Tournaire-Roux et al. 2003; Törnroth-Horsefield et al. 2006) have been identified...

    Kerrie L. Forrestet al. The PIP and TIP aquaporins in wheat form a large and diverse family wi...

    • ...Roots show a remarkable capacity to adjust their properties to the physiological water demand of the whole plant and can alter their water permeability over the short term in response to several environmental stresses (see Maurel et al. 2002 for review; Javot and Maurel 2002)...
    • ...While studies on purified membrane vesicles indicate a constitutively high Pf in the tonoplast of all plants investigated, these studies point to a lower Pf in the plasma membrane (reviewed in Maurel et al. 2002)...

    M. Carmen Martínez-Ballestaet al. Two different effects of calcium on aquaporins in salinity-stressed pe...

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