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The effects of different nitrogen sources on camptothecin content and related gene expression in Camptotheca acuminata seedlings

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Abstract

Camptotheac acuminata Decne is a unique tree species in China with an important secondary metabolite, camptothecin (CPT), used in the treatment of cancer. Nitrogen (N) is an important element that affects plant growth and the accumulation of CPT. Reports on the effect of N on CPT synthesis from a genetic perspective are scarce. To explore the effects of different N sources and levels on CPT synthesis in C. acuminata, two-year-old seedlings were fertilized with different concentrations of pure ammonium sulphate, source of ammonium N (NH4+–N), and potassium nitrate for nitrate N (NO3−–N). Concentrations of 2.5, 5, 7.5, and 10 g pot−1 NH4+–N and NO3−–N were used. The results showed that 7.5 g NH4+–N and NO3−–N treatments were best for growth and fresh weight of leaves. Compared with the other treatments, the CPT content, tryptophan synthase and tryptophan decarboxylase activities, and expression of the CaTSB and CaTDC1 genes under the 2.5 g NH4+–N and NO3−–N treatments peaked significantly at 30 days. However, the expression of CaTDC2 surpassed that of the other two genes at 60 days. Therefore, compared with NH4+–N source, the NO3−–N source was more beneficial for growth, and NO3−–N was better for CPT yield. Consequently, leaves of C. acuminata treated with 2.5 g NO3−–N could be harvested after 30 days to obtain maximum CPT content. CaTDC1 is more closely linked to CPT synthesis. The results of this study improved the production of CPT in C. acuminata via fertilization.

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Authors and Affiliations

  1. School of Landscape Architecture, Zhejiang Agriculture and Forestry University, Hangzhou, 310000, People’s Republic of China

    Xiaode Wang, Sainan Bian, Pengjie Chang, Ninghang Wang, Lingjuan Xuan, Mingru Zhang, Bin Dong, Chao Zhang & Yamei Shen

  2. Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang Agriculture and Forestry University, Hangzhou, 310000, People’s Republic of China

    Jiasheng Wu & Yeqing Ying

  3. Zhejiang Radio and Television University, Hangzhou, 310000, People’s Republic of China

    Xiazhen Lin

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  1. Xiaode Wang
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Correspondence to Yamei Shen.

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Project funding: This research was sponsored by the 13th Five-Year-Plan National Projects for Camptotheca acuminata Decne Efficient Cultivation Technology Research of China (2017YFD0600706).

The online version is available at http://www.springerlink.com

Corresponding editor: Yanbo Hu.

Xiaode Wang and Sainan Bian: Co-first authors with the same contribution to this paper.

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Wang, X., Bian, S., Chang, P. et al. The effects of different nitrogen sources on camptothecin content and related gene expression in Camptotheca acuminata seedlings. J. For. Res. 31, 1347–1357 (2020). https://doi.org/10.1007/s11676-019-01035-3

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