Major intrinsic proteins (MIPs) are a family of channel proteins that are mainly represented by aquaporins in plants. These are divided into TIPs (tonoplast intrinsic proteins) and PIPs (plasma membrane intrinsic proteins) according to their subcellular localization. Homologues to PIPs and TIPs were isolated from the desiccation-tolerant resurrection plant Craterostigma plantagineum by two approaches: firstly, a cDNA library constructed from RNA of dehydrated C. plantagineum leaves was screened with an Arabidopsis thaliana Ath-PIP1b cDNA probe and, secondly, a cDNA library was screened differentially to isolate early drought-induced transcripts. According to sequence homologies the isolated cDNA clones were grouped as follows: Cp-PIPa, Cp-PIPb, Cp-PIPc and Cp-TIP.
Plant Molecular Biology – Springer Journals
Published: Oct 6, 2004
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