Correlation analysis between the rate of respiration in the root and the active components in licorice (Glycyrrhiza uralensis)

Guo,Peijun; Sun,Zhirong; Liu,Wenlan; Chen,Long; Du,Yuan; Wei,Xinxin

doi:10.3892/etm.2013.1387

Correlation analysis between the rate of respiration in the root and the active components in licorice (Glycyrrhiza uralensis)

Authors:
- Peijun Guo
- Zhirong Sun
- Wenlan Liu
- Long Chen
- Yuan Du
- Xinxin Wei
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Affiliations: School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 100029, P.R. China
Published online on: November 7, 2013 https://doi.org/10.3892/etm.2013.1387
Pages: 270-274

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Abstract

The aim of this study was to investigate the correlation between root respiration and the percentage of active components in licorice (Glycyrrhiza uralensis Fisch.), in order to provide a foundation for the regulation and modulation of the quality of G. uralensis. Respiration efflux of annual and biennial G. uralensis was determined using a Li‑7000 CO2/H2O analyzer. The root systems were scanned at a resolution of 3,000 dpi using an Epson Expression 10000XL scanner. Root growth was determined by analyzing the scanned images using WinRHIZO version Pro2007d software and the rate of respiration in the root was subsequently calculated. In addition, the percentages of the five major active components in licorice, glycyrrhizic acid, glycyrrhizin, isoliquiritin, liquiritigenin and isoliquiritigenin, were detected using high‑performance liquid chromatography (HPLC). The correlation between the root respiration and the percentage of the active components was investigated. Significant seasonal changes were observed in the rates of respiration of first and zero‑class roots. In annual and biennial G. uralensis, the maximum and minimum values for rate of respiration were present in July (P<0.05) and November (P<0.05), respectively. The correlation coefficients between the five major active components and the rate of respiration were ‑0.304 (glycyrrhizin), ‑0.129 (liquiritigenin), ‑0.441 (glycyrrhizic acid; P<0.05), ‑0.471 (isoliquiritin; P<0.05) and 0.148 (isoliquiritigenin). The percentages of glycyrrhizic acid and isoliquiritin were significantly negatively correlated with the rate of respiration in annual and biennial G. uralensis. Understanding the correlation between the root rate of respiration and the active components in G. uralensis may be beneficial to ensuring the quality of cultivated G. uralensis.

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