基于浙贝母鳞茎产量的最适施钾量筛选及浙贝母钾素营养评价
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浙江中医药大学 药学院 杭州 310053

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Screening of the Optimal Potassium Fertilization Rate for Maximizing Bulb Yield and Potassium Nutrient Evaluation in Fritillaria thunbergii Miq.
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School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China

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    摘要:

    背景:浙贝母是百合科贝母属植物浙贝母(Fritillaria thunbergii Miq.)的干燥鳞茎,是我国传统的大宗中药材,位列浙产道地药材--“浙八味”之首。浙贝母对钾素的需求高于氮素和磷素,但其响应钾素的相关研究较少。目的与方法:为明确浙贝母最适施钾量及评价浙贝母钾素营养状况,本试验选取2个浙贝母品种,设置6个施钾量(0、40、80、120、160和200 kg K2O ha?1),开展为期两年的大田栽培研究。结果:施钾量40 kg K2O ha?1时浙贝母鳞茎品质即符合中国药典标准,施钾量大于120 kg K2O ha?1时浙贝母鳞茎产量进入平台期。叶片钾含量与鳞茎产量显著正相关,且对不同施钾量的敏感性高于其他地上器官(茎和花)钾含量。施钾可延长叶片生物量快速积累时间,提高积累速率。2个品种对施钾量的响应模式相似,但浙贝2号较浙贝1号具有更高的钾肥偏生产力和叶片生物量。结论:本实验条件下,施钾量108.4-128.0 kg K2O ha?1可获得高产优质浙贝母鳞茎。以叶片钾含量为基础建立的浙贝母钾营养指数(KNI)模型具有较好的生物学意义,且兼顾准确性和简便性,可用于浙贝母钾素营养状况的动态诊断。

    Abstract:

    Background: The dry bulb of Fritillaria thunbergii Miq. is a traditional Chinese medicine, and is the leading product of the geo-authentic crude drugs ‘Zhebawei’ in Zhejiang Province. Fritillaria thunbergii requires more potassium (K) than nitrogen and phosphorus, while the response of F. thunbergii to K has rarely been studied. Objective and Methods: To evaluate the K nutritional status of F. thunbergii, a 2-year field experiment was conducted under six K application rates (0, 40, 80, 120, 160, and 200 kg K2O ha?1) with two F. thunbergii cultivars (ZB1, narrow-leaf; ZB2, broad-leaf). Results: The bulbus Fritillariae Thunbergii (BFT) yield increased to a plateau with more than ~120 kg K2O ha–1. The BFT quality met the standard of Pharmacopoeia of P. R. China with more than 40.0 kg K2O ha–1. Leaf K concentration was significantly correlated with BFT yield, and was more sensitive to K application rate as compared to those of stems and flowers. Potassium application extended the duration of rapid leaf-biomass accumulation and increased the accumulation rate. Two cultivars had similar response patterns to K application, but ZB2 had higher K partial productivity, leaf-biomass, and leaf K concentration than ZB1. Conclusion: 108.4–128.0 kg K2O ha–1 was the optimal K application range for BFT yield. The potassium nutrition index (KNI) model established based on leaf K concentration has biological significance and can be used for dynamic diagnosis of K nutritional status of F. thunbergii with both accuracy and simplicity.

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  • 在线发布日期: 2021-11-08
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