title: Identification and expression of nine oak aquaporin genes in the primary root axis of two oak species, Quercus petraea and Quercus robur.
abstract: Aquaporins (AQPs) belong to the Major Intrinsic Protein family that conducts water and other small solutes across biological membranes. This study aimed to identify and characterize AQP genes in the primary root axis of two oak species, Quercus petraea and Quercus robur. Nine putative AQP genes were cloned, and their expression was profiled in different developmental root zones by real-time PCR. A detailed examination of the predicted amino acid sequences and subsequent phylogenetic analysis showed that the isolated AQPs could be divided into two subfamilies, which included six plasma membrane intrinsic proteins (PIPs) and three tonoplast intrinsic proteins (TIPs). We characterized the anatomical features of the roots and defined three developmental root zones: the immature, transition and mature zones. Expression analysis of the AQPs was performed according to these root developmental stages. Our results showed that the expression of PIP2;3 and TIP1 was significantly higher in Quercus petraea compared with Quercus robur in the three root zones. However, PIP2;1 and TIP2;1 were found to be differentially expressed in the mature zone of the two oak species. Of the nine AQP genes identified and analyzed, we highlighted four genes that might facilitate a deeper understanding of how these two closely related tree species adapted to different environments.
authors.affiliation: Université de Franche-Comté, UMR 6249 Chrono-Environnement, Besançon, France.
authors.forename: Claire
authors.initials: C
authors.lastname: Rasheed-Depardieu
authors.forename: Claire
authors.initials: C
authors.lastname: Parent
authors.forename: Michèle
authors.initials: M
authors.lastname: Crèvecoeur
authors.forename: Julien
authors.initials: J
authors.lastname: Parelle
authors.forename: Fabienne
authors.initials: F
authors.lastname: Tatin-Froux
authors.forename: Grégoire
authors.initials: G
authors.lastname: Le Provost
authors.forename: Nicolas
authors.initials: N
authors.lastname: Capelli
mesh_terms: D000595:Amino Acid Sequence; D020346:Aquaporins / Q000235:genetics*; D003001:Cloning, Molecular; D008969:Molecular Sequence Data; D010802:Phylogeny; D018517:Plant Roots / Q000737:chemistry / Q000235:genetics*; D029963:Quercus / Q000145:classification / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid
chemical_list: D020346:Aquaporins; D012333:RNA, Messenger