Rhododendron catawbiense plasma membrane intrinsic proteins are aquaporins, and their over-expression compromises constitutive freezing tolerance and cold acclimation ability of transgenic Arabidopsis plants.

Abstract excerpt

Extracellular freezing results in cellular dehydration caused by water efflux, which is likely regulated by aquaporins (AQPs). In a seasonal cold acclimation (CA) study of Rhododendron catawbiense, two AQP cDNAs, RcPIP2;1 and RcPIP2;2, were down-regulated as the leaf freezing tolerance (FT) increased from -7 to approximately -50 degrees C. We hypothesized this down-regulation to be an adaptive component of CA...

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