镁对滇重楼生长、养分吸收和总皂甙含量的影响

采用盆栽试验,设4个施镁水平,即:Mg 0、40、80、160 mg/kg,研究了不同水平镁对滇重楼生长、养分含量和块茎总皂甙含量的影响。结果表明,与不施镁相比,适宜施镁量能显著降低了滇重楼株高和生物量及块茎产量。Mg 80和40 mg/kg处理,滇重楼生物量和块茎增加百分率最高,超过以上水平时,总生物量和块茎产量显著下降。施Mg对滇重楼各部位N含量影响较小,但低镁水平（Mg 40 mg/kg）可显著提高滇重楼各部位P、K的含量。在本试验范围内,各部位镁含量随镁施用水平增加而显著增加。施Mg 80 mg/kg时,新块茎总皂甙含量最高;而施Mg 40 mg/kg时,老块茎总皂甙含量最高。综合考虑滇重楼生长、药用部位生物量累积和总皂甙含量,本试验条件下,以施Mg 40 mg/kg较为适宜。

Effects of Mg fertilization on growth, nutrient absorption and total saponins content of Paris polyphilla var. yunnanensis

A pot experiment was carried out to study the effects of application of Mg on growth, biomass, nutrient content and total saponins content in different parts of Paris polyphylla var.yunnanenis. There were four levels of Mg application, namely Mg 0, 40, 80 and 160 mg/kg. The result shows that height of the plant is decreased significantly with the application of Mg. Total biomass is the highest under the Mg 80 mg/kg treatment, while the increased percentage of tube weight is under the Mg 40 mg/kg treatment. When the applied Mg is larger than these levels, the total biomass and the increased percentage of tube weight are significantly decreased. Low level of Mg (40 mg/kg) could increase K and P contents of the different parts; however, the Mg application has little effects on N content of the different parts. The Mg content in the different parts increase with the Mg application levels. The total saponins content of new tuber is highest at the Mg 80 mg/kg level, and that of old tuber is highest at the Mg 40 mg/kg level. Comprehensively considering growth, tube weight and total saponins content, the Mg 40mg/kg application is suggested for Paris polyphylla var. yunnanenis.