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Distinct cis-acting sequences are required for the germination and sugar responses of the cucumber isocitrate lyase gene
journal contribution
posted on 2023-05-18, 11:27 authored by de Bellis, L, Ismail, I, Reynolds, SJ, Barrett, MD, Steven SmithSteven SmithRecent data have shown that distinct DNA sequence elements direct the germination and sugar responses of the cucumber (Cucumis sativus, L.) malate synthase (Ms) gene ( Sarah et al. (1996)Mol. Gen. Genet., 250, 153–161). Such information is, however, lacking for the isocitrate lyase (Icl) gene which is coordinately regulated with Ms. Deletions from the 5′ end of the Icl promoter were therefore created specifically to address this question. Analysis of expression in seeds of transgenic Nicotiana plumbaginifolia plants showed that whereas a promoter sequence of 2.9 kilobases (kb) produced a normal germination response, deletion to −1568 base pairs (bp) dramatically reduced this response. Examination of the sugar response employed a transgenic cucumber root system. In this case, the 2900 bp and 1568 bp promoters both gave a strong sugar response, but further deletion to −1367 bp eliminated the response. Therefore, the germination and sugar responses of the Icl gene require distinct cis-acting elements, located respectively upstream and downstream of −1568 bp. This observation is consistent with distinct signal transduction systems regulating gene expression in each case.
History
Publication title
GeneVolume
197Issue
1-2Pagination
375-378ISSN
0378-1119Department/School
School of Natural SciencesPublisher
Elsevier Science BvPlace of publication
Po Box 211, Amsterdam, Netherlands, 1000 AeRepository Status
- Restricted