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Slash pine genetic transformation through embryo cocultivation with A. tumefaciens and transgenic plant regeneration

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Abstract

Agrobacterium-mediated genetic transformation has been widely used to generate transgenic plants in angiosperms. However, progress in conifer species has lagged because of the recalcitrant nature of gene transfer. In this study, a transgenic plant regeneration system has been established for slash pine (Pinus elliottii Engelm.) using Agrobacterium-mediated transformation. Among the different Agrobacterium tumefaciens strains (EHA105, GV3101, and LBA4404) tested, the highest frequency (60%) of transient β-glucuronidase-expressing embryos was obtained from Agrobacterium strain GV3101 with over 330 blue spots per embryo. To improve the frequency of transformation, different cocultivation conditions were analyzed. Combination of Agrobacterium density at OD600 = 0.9, 50 s sonication of embryos, and the addition of 50 μM acetosyringone produced the highest transformation efficiency, in which 56.2% of embryos formed hygromycin-resistant calli. Transient gene expression was observed in cotyledons and hypocotyls, but transgenic plants were only produced from callus cultures derived from embryonic cotyledons of transformed slash pine. Stable integration of transgenes in the plant genome of slash pine was confirmed by polymerase chain reaction, Southern blot, and Northern blot analyses. Transgenic lines with a single T-DNA copy were produced from Agrobacterium strains EHA105 (80.4%), GV3101 (95.7%), and LBA4404 (66%). These results demonstrated that a stable transformation system has been established in slash pine, and this system could provide an opportunity to transfer economically important genes into slash pine.

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Acknowledgments

I would like to thank members of the Biotechnology Lab at Yangtze University for support. This work was supported by a grant from the education committee of Hubei Providence of China.

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Authors and Affiliations

  1. College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei Province, 434025, People’s Republic of China

    Wei Tang, Bo Xiao & Yongjun Fei

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  1. Wei Tang
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  2. Bo Xiao
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  3. Yongjun Fei
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Correspondence to Wei Tang.

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Editor: J. Forster

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Tang, W., Xiao, B. & Fei, Y. Slash pine genetic transformation through embryo cocultivation with A. tumefaciens and transgenic plant regeneration. In Vitro Cell.Dev.Biol.-Plant 50, 199–209 (2014). https://doi.org/10.1007/s11627-013-9551-7

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