Abstract
Efficient transformation of lilies is required for their genetic improvement in ornamental and marketable qualities. Although Lilium longiflorum can be transformed by particle bombardment and Agrobacterium, the transformation frequency is low. In this study, we tested new Agrobacterium-mediated transformation methods using shoot segments combined with two different regeneration systems. Shoot segments were co-cultivated for 2 d with Agrobacterium tumefaciens strain AGL1/pCAS04 harboring a binary vector carrying the neomycin phosphotransferase II driven by a promoter from the maize ubiquitin gene. The effect of different concentrations of 6-benzyladenine (BA) and 2,4-dichlorophenoxyacetic acid (2,4-D) on regeneration was investigated. The results indicated that Murashige and Skoog (MS) medium with 4.4 μM BA and 0.5 μM α-naphthalene acetic acid was optimal for shoot formation, and the nodal stem was the best explant for shoot induction. MS medium with 9.0 μM 2,4-D and 0.4 μM BA was optimal for callus induction. The direct shoot formation method regenerated 187 plantlets per 100 explants, and 74.4% of the regenerants were positive in transgene PCR. The callus regeneration method regenerated 20 plantlets per 100 explants, and 31.5% of them were PCR positive. Southern blotting confirmed the insertion of transgene in the plant host genome. The direct shoot formation method is more than 20-fold more efficient than previously reported transformation method in this species.
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Acknowledgments
We thank Dr. Chengcai Chu, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China for the gift of A. tumefaciens strain AGL1/pCAS04. This work was supported by National Nonprofit Institute Research Grant of Institute of Tropical Bioscience and Biotechnology CATAS-ITBB (ITBBYB071, Haikou, China) and a grant of the Scientific Fund of Chinese Academy of Tropical Agricultural Sciences (No. Rky0529, Haikou, China). We wish to thank Professor Sixiang Zheng, Yunnan Agricultural University, Kunming, China, for his kindly providing experiment materials and Mr. Kang Lai for his carefully planting plantlets. All the authors are grateful to Dr. Nanfei Xu and Ms. Amy McCaskill, BASF Plant Science L.L.C., NC, USA for their polishing this manuscript.
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Editor: D. T. Tomes
Juhua Liu and Jing Zhang contributed equally to this work.
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Liu, J., Zhang, J., Xu, B. et al. Regeneration and production of transgenic Lilium longiflorum via Agrobacterium tumefaciens . In Vitro Cell.Dev.Biol.-Plant 47, 348–356 (2011). https://doi.org/10.1007/s11627-010-9336-1
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DOI: https://doi.org/10.1007/s11627-010-9336-1