Appropriate nitrogen application enhances saponin synthesis and growth mediated by optimizing root nutrient uptake ability
Appropriate nitrogen application enhances saponin synthesis and growth mediated by optimizing root nutrient uptake ability
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适当的氮肥施用通过优化根部养分吸收能力来增强皂苷合成和生长
DOI：
10.1016/j.jgr.2019.04.003
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发表时间：
2019-04
影响因子：
6.3
通讯作者：
Yixiang Liu
中科院分区：
文献类型：
--
作者：
Wei Wei;Chen Ye;Huichuan Huang;Min Yang;Xinyue Mei;Fei Du;Xiahong He;Shusheng Zhu;Yixiang Liu
背景：药用作物合成数百种具有治疗功能的物质，其栽培主要集中在次生代谢物的合成而不是生物量的积累。营养是植物生长和次生代谢物的重要制约因素，但人们对养分吸收和次生代谢物合成对土壤氮变化响应的可塑性关注甚少。以细胞内合成高水平皂苷的三七为材料，通过2年的田间试验，研究了施氮对三七生物量、养分吸收、根系构型的时间动态影响，以及这些参数与皂苷合成的关系。结果：增加施氮量可以通过提高最大日生长量（或养分吸收量）来提高干物质产量和养分吸收能力。在适宜的氮素水平（225 kg/ hm2）下，三栖通过限制根长和表面积，提高根径和每根长吸氮速率（NURI）来促进养分吸收，但在土壤缺氮条件下，三栖根系构型和NURI则相反。增加施氮量可通过提高NURI促进根系中皂苷的积累，且NURI与主根中皂苷含量呈显著正相关。结论：适宜的施氮量可优化根系构型和养分吸收效率，促进干物质积累和皂苷合成。
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 accu-mulation 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.
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影响因子：
1.1
作者：
Xiaohong Ou;Ye Yang;Lanping Guo;Duanwei Zhu;Dahui Liu
通讯作者：
Xiaohong Ou;Ye Yang;Lanping Guo;Duanwei Zhu;Dahui Liu
DOI：
10.1016/b978-012088457-5/50019-8
发表时间：
2005
期刊：
--
影响因子：
--
作者：
C. Orians;B. Babst;A. Zanne
通讯作者：
C. Orians;B. Babst;A. Zanne
影响因子：
5.8
作者：
Hauggaard-Nielsen, H;Jensen, ES
通讯作者：
Jensen, ES
影响因子：
4.9
作者：
Croft, Simon Antony;Hodge, Angela;Pitchford, Jonathan W.
通讯作者：
Pitchford, Jonathan W.
DOI：
10.2991/iceesd-18.2018.224
发表时间：
2018-05
期刊：
--
影响因子：
--
作者：
Lin Zhou;Qiulin Yue;Lin Zhao;R. Cui;Xinli Liu
通讯作者：
Lin Zhou;Qiulin Yue;Lin Zhao;R. Cui;Xinli Liu