Identification of grapevine aquaporins and expression analysis in developing berries.
Aquaporins are membrane water channels that play critical roles in controlling the water content of cells and tissues. In this work, nine full-length cDNAs encoding putative aquaporins were isolated from grape berry cDNA libraries. A phylogenetic analysis conducted with 28 aquaporin genes identified in the grapevine genome and previously characterized aquaporins from Arabidopsis indicates that three cDNAs encode putative tonoplast aquaporins (TIPs) whereas six cDNAs belong to the plasma membrane aquaporin subfamily (PIPs). Specific probes designed on the 3' untranslated regions of each cDNA were used for the preparation of cDNA macroarray filters and in situ hybridization experiments. Macroarray data indicate that expression levels of most TIP and PIP genes depend on grape berry developmental stages and point out to a global decrease of aquaporin gene expression during berry ripening. In young berries, high expression of aquaporin genes was preferentially observed in dividing and elongating cells and in cells involved in water and solutes transport. Taken together, the data provided in this paper indicate that aquaporins are implicated in various physiological aspects of grape berry development.
Institut des Sciences de la Vigne et du Vin, Unité Mixte de Recherche Ecophysiologie et Génomique Fonctionnelle de la Vigne, Domaine de la Grande Ferrade, Université de Bordeaux 1, Villenave d'Ornon, France.
Romain
R
Fouquet
Céline
C
Léon
Nathalie
N
Ollat
François
F
Barrieu
D000595:Amino Acid Sequence; D020346:Aquaporins / Q000235:genetics / Q000378:metabolism*; D017360:Arabidopsis / Q000235:genetics / Q000254:growth & development; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D015723:Gene Library; D017343:Genes, Plant; D018745:Genome, Plant; D008969:Molecular Sequence Data; D020411:Oligonucleotide Array Sequence Analysis; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D018749:RNA, Plant / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D027843:Vitis / Q000235:genetics* / Q000254:growth & development
D020346:Aquaporins; D018076:DNA, Complementary; D010940:Plant Proteins; D018749:RNA, Plant