High nitrogen inhibits biomass and saponins accumulation in a medicinal plant Panax notoginseng

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Plant Biology

Main article text

 

Introduction

Materials and Methods

Plant materials and growth conditions

Plant morphology and biomass allocation

Determination of chlorophyll content

Measurement of gas exchange parameters

Calculation of photosynthetic N allocation

Nitrogen use efficiency

Saponins content

Statistical analysis

Results

Responses of the N content and morphological traits to N regimes

Biomass accumulation and allocation in response to N supply

Nitrogen use efficiency in response to N availability

N-driven changes in photosynthetic-related parameters

Analysis of saponin in P. notoginseng root

Pearson correlation analysis of parameters

Comparison of the sensitivity of the different parameters in response to N regimes

DISCUSSION

A “survival strategy” of inhibiting root growth under N excess

N-mediated NUE and PNUE to alter biomass allocation

The decline in saponins contents is related to the ratio of C/N under N excess

Moderate N application could improve the economic yield

Conclusion

Supplemental Information

Supplementary Figures.

DOI: 10.7717/peerj.14933/supp-1

Supplementary Table.

DOI: 10.7717/peerj.14933/supp-2

Additional Information and Declarations

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Zhu Cun conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft.

Hong-Min Wu conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft.

Jin-Yan Zhang conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft.

Sheng-Pu Shuang conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft.

Jie Hong conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft.

Tong-Xin An conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft.

Jun-Wen Chen conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft.

Data Availability

The following information was supplied regarding data availability:

All raw data are available in the Supplemental File.

Funding

This research was supported by the National Natural Science Foundation of China (32160248 and 81860676), the Major Special Science and Technology Project of Yunnan Province (202102AA310048), the National Key Research and Development Plan of China (2021YFD1601003), and the Innovative Research Team of Science and Technology in Yunnan Province (202105AE160016). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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