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Asymmetric somatic hybridization between Bupleurum scorzonerifolium Willd. and Taxus chinensis var. mairei

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Abstract

In an attempt to transfer the genetic components needed for taxol synthesis into a more tractable plant, protoplasts of Taxus chinensis var. mairei were UV irradiated for various times prior to their fusion with protoplasts of Bupleurum scorzonerifolium. Of the 60 presumptive hybrid calli obtained, selections of the 9 most rapidly growing were recognized as hybrid clones based on a combination of their callus morphology, esterase profile, chromosome number, and RAPD genotype. The RAPD data showed that 82.4–96.8% of the hybrid genome was inherited from the recipient (B. scorzonerifolium) and 4.6–13.9% from the donor (T. chinensis), with 1.6–6.9% of the RAPD fragments being not present in either parent. None of the hybrid clones expressed a detectable quantity of taxol, but four produced more of the triterpenoid oleanolic acid than did calli of the recipient. With the use of semi-quantitative reverse transcriptase PCR, it was possible to show variation in the expression of several triterpenoid biosynthetic pathway related genes between B. scorzonerifolium and the hybrids. Increasing the concentration of oleanolic acid requires that the expression levels of the genes encoding IPP isomerase, squalene synthase, squalene epoxidase and β-amyrin synthase are increased, while at the same time, those of the genes encoding the branching enzymes cycloartenol synthase and lupeol synthase need to be reduced.

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Acknowledgments

This work was supported by the Chinese National Special Science Research program (grant no. 2007CB948203), National Natural Science Foundation (30771116 and 30970243) and Natural Education Ministry Doctor Station Foundation Fellowship (913111006); and the Shandong Province Excellent Youth Foundation (JQ200810) and Science & Technology Plan (2009GG10002001).

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Authors and Affiliations

  1. The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, 27 Shandanan Road, Jinan, 250100, People’s Republic of China

    Fangfang Zhang, Peng Wang, Dandan Ji, Guangwen Kang & Fengning Xiang

  2. Beijing Genomics Institute (Shenzhen), Shenzhen, 518083, People’s Republic of China

    Fangfang Zhang

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  1. Fangfang Zhang
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  2. Peng Wang
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  3. Dandan Ji
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  4. Guangwen Kang
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  5. Fengning Xiang
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Corresponding author

Correspondence to Fengning Xiang.

Additional information

Communicated by D. Zaitlin.

F. Zhang and P. Wang contribute equally to the article.

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Zhang, F., Wang, P., Ji, D. et al. Asymmetric somatic hybridization between Bupleurum scorzonerifolium Willd. and Taxus chinensis var. mairei . Plant Cell Rep 30, 1857–1864 (2011). https://doi.org/10.1007/s00299-011-1093-z

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  • DOI: https://doi.org/10.1007/s00299-011-1093-z

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