Abstract
The genomic organization of two extracellular invertase genes from tomato (Lin5 and Lin7), which are linked in a direct tandem repeat, and their tissue-specific and hormone-inducible expression are shown. Transient expression analysis ofLin5 promoter sequences fused to the β-glucuronidase (GUS) reporter gene (uidA) demonstrates a specific expression of Lin5during tomato fruit development. A Lin5 promoter fragment was fused to the truncated nos promoter to analyse hormone induction via GUS reporter gene activity in transiently transformed tobacco leaves. A specific up-regulation of GUS activity conferred by this Lin5 promoter fragment in response to gibberellic acid (GA), auxin and abscisic acid (ABA) treatment was observed, indicating a critical role of the regulation of Lin5 by phytohormones in tomato flower and fruit development. In situ hybridization analysis of Lin7 shows a high tissue-specific expression in tapetum and pollen. These results support an important role for Lin5 and Lin7 extracellular invertases in the development of reproductive organs in tomato and contribute to unravel the underlying regulatory mechanisms.
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Proels, R., Hause, B., Berger, S. et al. Novel mode of hormone induction of tandem tomato invertase genes in floral tissues. Plant Mol Biol 52, 191–201 (2003). https://doi.org/10.1023/A:1023973705403
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DOI: https://doi.org/10.1023/A:1023973705403