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Abstract
ATP binding cassette (ABC) transporters retain increasing attention since their implication in multidrug resistance has been demonstrated in several prokaryotic and eukaryotic cells. Many ABC proteins are known in various organisms but only few in higher plants. We report here on the characterization of a partial 955 bp clone (Cr-ABC1) isolated from a Catharanthus roseus cDNA library, which shows high homology (65% identity) with the TUR2 cDNA previously isolated from the water lens Spirodela polyrrhiza. Accumulation of Cr-ABC1 transcripts in cultured C. roseus cells was enhanced by cytokinin or methyl jasmonate addition to, or auxin suppression from the culture medium. In whole plants, the gene was mainly expressed in flowers.
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