Summary
Two different promoters, a cauliflower mosaic virus (CaMV) 35S promoter with a 5′-untranslated leader sequence from alfalfa mosaic virus RNA4 (designated as CaMV 35S/AMV) and an E-8 fruit-ripening-specific promoter, were compared to evaluate their effects on expression of the uidA reporter gene in transgenic tomato plants. In order to generate sufficient numbers of transgenic tomato plants, both a reliable regeneration system and an efficient Agrobacterium transformation protocol were developed using 8-d-old cotyledons of tomato (Lycopersicon ecsulentum Mill. cv. Swifty Belle). Two sets of constructs, both derivatives of the binary vector pBI121, were used in transformation of tomato whereby the uidA gene was driven either by the CaMV 35S/AMV or the E-8 fruit-ripening-specific promoter. Southern blot hybridization confirmed the stable integration of the chimeric uidA gene into the tomato genome. Fruit and leaf tissues were collected from T0 and T1 plants, and assayed for β-glucuronidase (GUS) enzyme activity. As expected, both vegetative and fruit tissues of transgenic plants carrying the uidA gene under the control of CaMV 35S/AMV showed varying levels of GUS activity, while no expression was observed in vegetative tissues of transgenic plants carrying the uidA gene driven by the E-8 promoter. All fruits from transgenic plants produced with both sets of constructs displayed expression of the uidA gene. However, when this reporter gene was driven by the CaMV 35S/AMV, GUS activity levels were significantly higher than when it was driven by the E-8 fruit-specific promoter. The presence/absence of the uidA gene in T1 plants segregated in a 3∶1 Mendelian ratio.
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Krasnyanski, S.F., Sandhu, J., Domier, L.L. et al. Effect of an enhanced CaMV 35S promoter and a fruit-specific promoter on uida gene expression in transgenic tomato plants. In Vitro Cell.Dev.Biol.-Plant 37, 427–433 (2001). https://doi.org/10.1007/s11627-001-0075-1
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DOI: https://doi.org/10.1007/s11627-001-0075-1