Summary
False positive transformants obtained during plant transformation experiments on species of the monocotyledonous genus Dioscorea (yam) are described. The false positive results were found to be due to endophytic bacteria which exist within aseptically micropropagated shoot cultures and which express β-glucuronidase (GUS). The bacteria were isolated and identified as two species of Curtobacterium. The expression of GUS in these organisms was found to be induced by a variety of glucuronide substrates. The induction of GUS activity in the bacteria can be inhibited by chloramphenicol, tetracycline, ticarcillin and sodium azide. Implications of these results for use of the gus gene in plant transformation work are discussed.
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Abbreviations
- DTT:
-
Dithiothreitol
- EDTA:
-
Ethylenediamine tetra-acetic acid
- ELISA:
-
Enzyme-linked immuno-sorbent assay
- GUS:
-
β-glucuronidase
- LB:
-
Luria Bertani
- MUG:
-
4-Methylumbelliferyl-β-D-glucuronide
- PNPG:
-
p-nitrophenyl-β-D-glucuronide
- PVP:
-
Polyvinylpyrrolidone
- SDS:
-
Sodium dodecyl sulphate
- TAE:
-
Tris-acetate-EDTA buffer
- X-Gluc:
-
5-Bromo-4-chloro-3-indolyl-β-D-glucuronide
References
Ausubel FM, Brent R, Kingston RE, Moore DD, Seidmen JG, Smith JA and Struhl K (1989) Short protocols in molecular biology. A compendium of methods from current protocols in molecular biology. John Wiley and Sons, New York p61.
Bradford MM (1976) Anal. Biochem. 72:248–254.
Buehler HJ, Katzman PA, Doisy PP and Doisy EA (1949) Proc. Soc. Exptl. Biol. Med. 72:297–299.
Fishman WH (1955) Adv. Enzymol. 16:361–409.
Hu CY, Chee PP, Chesney RH, Zhou JH, Miller PD and O'Brien WT (1990) Plant Cell Reports 9:1–5.
Jefferson RA (1987) Plant Molec. Biol. Reporter 5:387–405.
Jefferson RA, Burgess SM and Hirsh D (1986) Proc. Natl. Acad. Sci. USA. 86:8447–8451.
Jefferson RA, Kavanagh TA and Bevan MW (1987) EMBO J. 6:3901–3907.
Karunairatnam MC and Levvy GA (1951) Biochem. J. 49:210–215.
Komagata K and Suzuki KI (1986) Bergey's Manual of Systematic Bacteriology, Vol 2, P.H.A.Sneath., N.S. Mair, M.E.Sharp.and J.G.Holt, eds, pp 1313–1317.
Leifert C, Waites WM and Nicholas JR (1989) J. Appl. Bacteriol. 67:353–361.
Liang W (1989) M.Phil. Dissertation, University of Cambridge, England.
Mantell SH, Haque SQ and Whitehall AP (1978) J. Hort. Science 53:95–98.
Miller IM and Reporter M (1987) Plant, Cell and Environment 10:413–424.
Plegt L and Bino RJ (1989) Molec. Gen. Genet. 216:321–327.
Robinson JJ, Blin CW and Frank PF (1952) J. Bacteriol. 64:719–723
Tör M, Ainsworth CC and Mantell SH (1990a) Abstracts VIIth Int'l. Congr. Plant Tissue and Cell Culture. (Abs# A2-138), Amsterdam, June 24–29.
Tor M, Mantell SH and Ainsworth CC (1990b) Abstracts VIIth Int'l. Congr. Plant Tissue and Cell Culture. (Abs # A2- 139), Amsterdam, June 24–29.
Wenzler HC, Mignery GA, Fisher LM and Park WD (1989) Plant Molec. Biol. 12:41–50
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Communicated by N. Amrhein
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Tör, M., Mantell, S.H. & Ainsworth, C. Endophytic bacteria expressing β-glucuronidase cause false positives in transformation of Dioscorea species. Plant Cell Reports 11, 452–456 (1992). https://doi.org/10.1007/BF00232689
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DOI: https://doi.org/10.1007/BF00232689