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Plant function and evolutionary biology
RESEARCH ARTICLE

Identification and functional characterisation of aquaporins in the grapevine, Vitis vinifera

Megan C. Shelden A B , Susan M. Howitt C , Brent N. Kaiser A and Stephen D. Tyerman A D
+ Author Affiliations
- Author Affiliations

A School of Agriculture, Food and Wine, University of Adelaide, Waite Campus, Glen Osmond, SA 5064, Australia.

B Present address: Australian Centre for Plant Functional Genomics, School of Botany, University of Melbourne, Parkville, Vic. 3010, Australia.

C Biochemistry and Molecular Biology, Research School of Biology, Australian National University, Canberra, ACT 0200, Australia.

D Corresponding author. Email: stephen.tyerman@adelaide.edu.au

Functional Plant Biology 36(12) 1065-1078 https://doi.org/10.1071/FP09117
Submitted: 21 May 2009  Accepted: 28 July 2009   Published: 3 December 2009

Abstract

Plant aquaporins belong to a large superfamily of conserved proteins called the major intrinsic proteins (MIPs). There is limited information about the diversity of MIPs in grapevine, and their water transport capacity. The aim of the present study was to identify MIPs from grapevine and functionally characterise water transport of a subset of MIPs. Candidate genes were identified, by screening a Vitis vinifera L. (cv. Cabernet Sauvignon) cDNA library with gene specific probes, for aquaporin cDNAs encoding members of the plasma membrane intrinsic protein (PIP) and tonoplast intrinsic protein (TIP) subfamilies. The screen resulted in the identification of 11 full-length and two partial length aquaporin cDNAs. VvTIP2;1 isoforms had different 3′ UTRs, immediately upstream of the poly(A) tail, suggesting the presence of multiple cleavage sites for polyadenylation. Using published genome sequences of grapevine, we conducted a phylogenetic analysis of the MIPs with previously characterised MIPs from Arabidopsis. We identified 23 full-length MIP genes from the V. vinifera genome sequence of a near homozygous line (PN40024) that cluster into the four main subfamilies (and subgroups within) identified in other species. However, based on the identification of PIP2 genes in Cabernet Sauvignon that were not present in the PN40024 genome, there are likely to be more than 23 MIP genes in other heterozygous grapevine cultivars. Water transport capacity was determined for several PIPs and TIPs, by expression in Xenopus oocytes. Only VvPIP2 and VvTIP proteins function as water channels with the exception of VvPIP2;5. VvPIP2;5 differs from the water conducting VvPIP2;1 by the substitution of two highly conserved amino acids in Loop B (G97S, G100W), which was shown by homology modelling to likely form a hydrophobic block of the water pore.

Additional keywords: VvPIP1, VvPIP2, VvTIP, VvNIP, VvSIP, VvXIP.


Acknowledgements

We thank Wendy Sullivan for expert technical assistance, Christa Niemietz for assistance with Xenopus oocytes and Lars Bredmose for assistance with the macroarray. This research was supported by the Australian Research Council, and the Grape and Wine Research and Development Corporation.


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