期刊
JOURNAL OF GINSENG RESEARCH
卷 44, 期 4, 页码 627-636出版社
KOREAN SOC GINSENG
DOI: 10.1016/j.jgr.2019.04.003
关键词
growth dynamics; maximum growth rate; nitrogen; root architecture; saponin synthesis
资金
- National Key R&D Program of China [2017YFD0201601-5, SQ2017YFC170021-02, 2018YFD0201100]
- Natural Science Foundation of China [31601682]
- Major Programme for Biomedicine of Yunnan Province [2016ZF001]
- Young and Middle-aged Academic and Technical Leaders Reserve Programme in Yunnan Province [2017HB024]
Background: Cultivation of medicinal crops, which synthesize hundreds of substances for curative functions, was focused on the synthesis of secondary metabolites rather than biomass accumulation. Nutrition is an important restrict factor for plant growth and secondary metabolites, but little attention has been given to the plasticity of nutrient uptake and secondary metabolites synthesis response to soil nitrogen (N) change. Methods: Two year-field experiments of Sanqi (Panax notoginseng), which can synthesize a high level of saponin in cells, were conducted to study the effects of N application on the temporal dynamics of biomass, nutrient absorption, root architecture and the relationships between these parameters and saponin synthesis. Results: Increasing N fertilizer rates could improve the dry matter yields and nutrient absorption ability through increasing the maximum daily growth (or nutrient uptake) rate. Under suitable N level (225 kg/ha N), Sanqi restricted the root length and surface and enhanced the root diameter and N uptake rate per root length (NURI) to promote nutrient absorption, but the opposite status of Sanqi root architecture and NURI was found when soil N was deficient. Furthermore, increasing N rates could promote the accumulation of saponin in roots through improving the NURI, which showed a significant positive relationship with the content of saponin in the taproots. Conclusion: Appropriate N fertilizer rates could optimize both root architecture and nutrient uptake efficiency, then promote both the accumulation of dry matter and the synthesis of saponins. (C) 2019 The Korean Society of Ginseng. Publishing services by Elsevier B.V.
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