Abstract
A cDNA clone, pBN59, was isolated by differential screening of a cDNA library of winter Brassica napus during cold acclimation. Nucleotide sequence of BN59 was found to be homologous to that encoding the 70 kDa subunit of the vacuolar H(+)-ATPase in plants. Transcripts hybridizing to BN59 accumulated during exposure to low temperatures and to the exogenous application of abscisic acid (ABA). Western blot analyses also indicated an increase in the 70 kDa subunit during cold acclimation. The accumulation of an endomembrane H(+)-ATPase is consistent with the observation of osmotic adjustment, increases in endogenous ABA and the proliferation of endomembranes during cold acclimation.
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