Effect of Silicon on Physiological Characteristics of Licorice Under Long-term Drought Stress

doi:10.11923/j.issn.2095-4050.cjas2023-0081

Abstract

Abstract:

To improve the quality of artificially cultivated licorice, a pot experiment was conducted at Yulin University using Ural licorice as the experimental material to analyze and evaluate its biomass, physiological and biochemical indicators, and root anatomical structure after adding exogenous silicon under drought stress. The results showed that the addition of exogenous silicon significantly increased the accumulation of dry matter in licorice under drought stress; the synthesis of glycyrrhetinic acid and glycyrrhizinwas significantly promoted; under drought stress, exogenous silicon addition increased root dry weight from 0.93 g/plant to 1.31 g/plant; the synthesis and accumulation of glycyrrhizin and glycyrrhetinic acidwere promoted, malondialdehyde contentwas reduced, leaf proline content and root soluble sugar contentwere increased, and xylem area/cross-sectional area and phloem/anatomical cross-sectional areawere increased; The addition of exogenous silicon significantly increased the hydraulic conductivity of licorice plants by 39.15% and 302% under two different soil moisture conditions, and the hydraulic conductivity and root injury volume of licorice plants were significantly positively correlated with licorice yield. The addition of exogenous silicon under drought stress improved the quality of licorice, promoted the synthesis and accumulation of secondary metabolites, enhanced root water absorption efficiency and overall hydraulic conductivity, and participated in the formation of root tissues under stress, thereby increasing licorice yield.

Key words: Ural licorice, quality, physiological and biochemical indicators, drought stress, hydraulic characteristics, anatomical structure, secondary metabolites, exogenous silicon

LIU Xiaoyan, LOU Li, ZHANG Nan, LING Zhaoxun, ZHANG Aoqi, ZHANG Wanming, YAN Jiakun. Effect of Silicon on Physiological Characteristics of Licorice Under Long-term Drought Stress[J]. Journal of Agriculture, 2025, 15(4): 13-21.

Figures/Tables 11

References 44

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