Abstract
Electrical discharge particle acceleration was used to test the transient expression of numerous inducible angiosperm promoters in a gymnospermPicea glauca (white spruce). Promoter expression was assayed in three different tissues capable ofin vitro regeneration, zygotic embryos, seedlings and embryogenic callus. The promoters tested include the light-inducibleArabidopsis and soybean ribulose-1,5-bisphosphate small subunit promoters and a maize phosphoenolpyruvate carboxylase promoter; a soybean heat-shock-inducible promoter, a soybean auxin inducible promoter and a maize alcohol dehydrogenase promoter. Promoters were cloned into a promoter-less expression vector to form a promoter-β-glucuronidase-nopaline synthase 3′ fusion. A similar construct was made using the cauliflower mosaic virus 35S (CaMV 35S) promoter as a control. All promoters were expressed in white spruce embryos, yet at levels lower than CaMV 35S. In addition, in the embryos the heat-shock and the alcohol dehydrogenase promoters showed inducible expression when given the proper induction stimulus. In seedlings, expression of all promoters was lower than in the embryos and expression was only inducible with the heat-shock promoter in the cotyledons. Of the tissues tested, the expression level of all promoters was lowest in embryogenic callus. Interestingly, the expression of the β-glucuronidase gene in embryogenic callus was restricted to the proembryonal head cells regardless of the promoter used. These results clearly demonstrate the use of particle bombardment to test the transient expression of heterologous promoters in organized tissue and the expression of angiosperm promoters in a gymnosperm.
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Ellis, D.D., McCabe, D., Russell, D. et al. Expression of inducible angiosperm promoters in a gymnosperm,Picea glauca (white spruce). Plant Mol Biol 17, 19–27 (1991). https://doi.org/10.1007/BF00036802
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DOI: https://doi.org/10.1007/BF00036802