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Kanamycin selection in temporary immersion bioreactors allows visual selection of transgenic citrus shoots

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Abstract

In mature citrus transformation, the nptII gene is most commonly used for selection and it is confounded by the high number of non-transformed, escaped shoots that develop on semi-solid kanamycin selection medium, even at high concentrations. Selection in liquid medium with kanamycin in temporary immersion bioreactors might provide a better means of distinguishing between transformed and non-transformed shoots. A dose-response curve was constructed for wild-type Carrizo rootstock in liquid medium to evaluate the effects of kanamycin concentration on the number and the length of microshoots. Kanamycin at 200 mg/l was chosen as the optimal concentration for selection of transgenic mature citrus shoots in bioreactors. At this dose, most non-transgenic microshoots turned yellow and their lengths and numbers were significantly reduced in comparison to the no kanamycin controls. Selection of transgenic shoots in bioreactors was tested after Agrobacterium transformations of mature Carrizo and Valencia using three different binary vectors containing nptII as the selectable marker. Shoots developed on semi-solid medium and were transferred to temporary immersion bioreactors containing liquid MS medium with 200 mg/l kanamycin. After two weeks of culture in bioreactors, 21 dark green shoots were visually selected on the basis of color from a total of 6882 microshoots, and 17 of them (81%) were confirmed as transgenic with either the GUS histochemical assay, GFP fluorescence or PCR. Yellow shoots (5675) to be discarded from pTLAB21 and pCAMBIA2301 transformations were also tested for GUS or GFP expression and only one (0.01%) was positive. Kanamycin selection of mature transgenic shoots in temporary immersion bioreactors permitted transgenics to be visually distinguished on the basis of color, and reduced labor and consumable costs for PCR screening, particularly when reporter genes were not used.

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Abbreviations

TIB:

Temporary immersion bioreactor

GUS:

β-glucuronidase

GFP:

Green fluorescent protein

nptII:

Neomycin phosphotransferase II

MS:

Murashige and Skoog

Cv.:

Cultivar

HLB:

Huanglongbing

Nos:

Nopaline synthase

35S:

Cauliflower mosaic virus 35S promoter

AtNPR1 :

Arabidopsis thaliana nonexpressor of pathogenesis-related gene

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Authors and Affiliations

  1. Plant Pathology Department, University of Florida, IFAS, CREC, Lake Alfred, USA

    Yosvanis Acanda, Michel Canton, Hao Wu & Janice Zale

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  1. Yosvanis Acanda
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  2. Michel Canton
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  3. Hao Wu
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  4. Janice Zale
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Correspondence to Janice Zale.

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Acanda, Y., Canton, M., Wu, H. et al. Kanamycin selection in temporary immersion bioreactors allows visual selection of transgenic citrus shoots. Plant Cell Tiss Organ Cult 129, 351–357 (2017). https://doi.org/10.1007/s11240-017-1182-y

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  • DOI: https://doi.org/10.1007/s11240-017-1182-y

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