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Aquaporins are channel proteins which transport water across cell membranes. We show that the bread wheat aquaporin gene  TaTIP2;2  maps to the long arm of chromosome 7b and that its product localizes to the endomembrane system. The gene is expressed constitutively in both the root and the leaf, and is down-regulated by salinity and drought stress. Salinity stress induced an increased level of C-methylation within the CNG trinucleotides in the  TaTIP2;2  promoter region. The heterologous expression of  TaTIP2;2  in  Arabidopsis thaliana  compromised its drought and salinity tolerance, suggesting that  TaTIP2;2  may be a negative regulator of abiotic stress. The proline content of transgenic  A. thaliana  plants fell, consistent with the down-regulation of  P5CS1 , while the expression of  SOS1 ,  SOS2 ,  SOS3 ,  CBF3  and  DREB2A , which are all stress tolerance-related genes acting in an ABA-independent fashion, was also down-regulated. The supply of exogenous ABA had little effect either on  TaTIP2;2  expression in wheat or on the phenotype of transgenic  A. thaliana . The expression level of the ABA signalling genes  ABI1 ,  ABI2  and  ABF3  remained unaltered in the transgenic  A. thaliana  plants. Thus  TaTIP2;2  probably regulates the response to stress via an ABA-independent pathway(s).

Heterologous Expression of the Wheat Aquaporin Gene TaTIP2;2 Compromises the Abiotic Stress Tolerance of Arabidopsis thaliana