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In higher plants, aquaporin proteins (AQPs) play important roles in the uptake of water across cell membranes. However, their functions in halophytes are still largely unknown. In this work, we isolated, cloned, and identified  KvTIP3 , a tonoplast intrinsic protein gene from  Kosteletzkya virginica . Bioinformatic analyses demonstrated that  KvTIP3  encoded a tonoplast protein with the common properties of AQPs. Further multiple sequence alignment and phylogenetic analyses showed that KvTIP3 shared 65%–82% homology with other AQPs from  Arabidopsis , cotton, polar, and cocoa. Quantitative real-time PCR (qPCR) analyses revealed that  KvTIP3  was ubiquitously expressed in various tissues such as leaves, stems, and roots, with a predominant expression in roots. In addition,  KvTIP3  transcript was strongly induced by NaCl, low temperature, and ABA in  K. virginica . Our findings suggest that  KvTIP3  encodes a new AQP possibly involved in multiple abiotic stress responses in  K. virginica , and  KvTIP3  could be used as a potential candidate gene for the improvement of plants resistant to various abiotic stresses.

The Tonoplast Intrinsic Protein Gene KvTIP3 is Responsive to Different Abiotic Stresses in Kosteletzkya virginica