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Plant and Cell Physiology, 1995, Vol. 36, No. 7 1349-1359
© 1995

Cytokinin Induces a Rapid Decrease in the Levels of mRNAs for Catalase, 3-Hydroxy-3-methylglutaryl CoA reductase, Lectin and Other Unidentified Proteins in Etiolated Cotyledons of Cucumber

Tomoko Toyama1, Haruhiko Teramoto1, Go Takeba2 and Hideo Tsuji3

1 Department of Botany, Faculty of Science, Kyoto University Kyoto, 606-01 Japan
2 Laboratory of Applied Biology, Faculty of Living Science, Kyoto Prefectural University Kyoto, 606 Japan
3 Department of Biology, Faculty of General Education, Kobe Women's University Kobe, 654 Japan

Large-scale differential hybridization was performed to examine rapid changes in gene expression caused by a phytohormone, cytokinin, in etiolated cotyledons of cucumber (Cucumis sativus L.). We isolated 86 cDNA clones for mRNAs whose levels decreased within 2 h of the start of treatment with N6-benzyladenine (BA). Partial nucleotide sequences showed that some of the cDNAs were homologous to those for catalase, 3-hydroxy-3-methylglutaryl CoA reductase (HMGR) and a lectin. This is the first report that the levels of the mRNAs for those proteins are regulated by a cytokinin in darkness. Together with previous results [Teramoto et al. (1993) Physiol. Plant. 87: 584, (1994) Planta 193: 573, (1995) Planta 196: 387], the present study suggests that the cytokinin act to lower the levels of mRNAs transcribed from various genes in etiolated cotyledons.

(Received May 18, 1995; Accepted August 17, 1995)
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