Abstract
An efficient system for gene transfer into plants of Brassica juncea var. India Mustard, mediated by Agrobacterium tumefaciens. was developed through the manipulation of the culture medium and the use of the appropriate Agrobacterium strain. High frequency shoot regeneration (90–100%) was obtained from hypocotyl explants grown on medium containing 0.9% agarose, 3.3 mg/L AgNO3 and 0.5–2 mg/L BA in combination with 0.01–0.05 mg/L 2,4-D or 0.1–1 mg/L NAA. Of all the Agrobacterium strains tested, A. tumefaciens A208-SE, carrying the disarmed Ti plasmid and a binary vector pROA93, was the most effective for B. juncea transformation. pROA93 carries the coding sequences of the NPTII and the GUS genes, both driven by a common CaMV 35S promoter in two divergent directions. Inoculated explants grown on the selection medium in the presence of 0.5 mg/L BA and 0.1 mg/L NAA gave rise to transgenic shoots at the highest frequency (9%). All Ro transgenic plants were phenotypically normal, but variation in expression patterns of the GUS gene occurred among the transgenic plants in an organ- and tissue-specific manner. Both the NPTII and the GUS genes were transmitted to the R1 seed progeny and showed co-segregation.
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Abbreviations
- BA:
-
benzyladenine
- 2,4-D:
-
2,4-dichlorophenoxyacetic acid
- NAA:
-
naphthaleneacetic acid
- NPTII:
-
neomycin phosphotransferase type II
- GUS:
-
β-glucuronidase
- CaMV:
-
cauliflower mosaic virus
- MS:
-
Murashige and Skoog
- X-Gluc:
-
5-bromo-4-chloro-3-indolyl-D-β-glucuronic acid
- IBA:
-
indolebutyric acid
- SDS:
-
sodium dodecyl sulfate
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Communicated by R. B. Horsch
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Barfield, D.G., Pua, EC. Gene transfer in plants of Brassica juncea using Agrobacterium tumefaciens-mediated transformation. Plant Cell Reports 10, 308–314 (1991). https://doi.org/10.1007/BF00193148
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DOI: https://doi.org/10.1007/BF00193148