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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1991 Jun 15;88(12):5212–5216. doi: 10.1073/pnas.88.12.5212

In vivo random beta-glucuronidase gene fusions in Arabidopsis thaliana.

S Kertbundit 1, H De Greve 1, F Deboeck 1, M Van Montagu 1, J P Hernalsteens 1
PMCID: PMC51842  PMID: 2052601

Abstract

Vectors were constructed for the isolation of random transcriptional and translational beta-glucuronidase gene fusions in plants. This system is based on the random integration of the transferred DNA (T-DNA) into the plant nuclear genome. The Escherichia coli beta-glucuronidase coding sequence without promoter, and also devoid of its ATG initiation site in the translational gene fusion vector, was inserted in the T-DNA with its 5' end at a distance of 4 base pairs from the right T-DNA border sequence. Transgenic plants can be selected by using a chimeric (P35S-nptII-3' ocs) kanamycin-resistance gene present in the same T-DNA. Subsequent screening of these for beta-glucuronidase expression allows the identification of clones harboring a fusion of the beta-glucuronidase coding sequence with plant 5' regulatory sequences. After transformation of Arabidopsis thaliana C24 root explants, beta-glucuronidase expression was detected in 54% and 1.6% of the plants transformed with the transcriptional and translational fusion vectors, respectively. Several different patterns of tissue-specific beta-glucuronidase expression were identified. The plant upstream sequence of a beta-glucuronidase fusion that is specifically expressed in the phloem of all organs was cloned and sequenced. After introduction in A. thaliana C24 and Nicotiana tabacum SR1, this sequence mediates the same highly phloem-specific beta-glucuronidase expression pattern as in the original transgenic plant from which it was isolated. These data demonstrate that this system facilitates the isolation and analysis of plant DNA sequences mediating regulated gene expression.

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Selected References

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