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The Effects of Root Temperature on Growth, Physiology, and Accumulation of Bioactive Compounds of Agastache rugosa

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  • Vu Phong Lam

    (Department of Horticultural Science, Chungnam National University, Daejeon 34134, Korea
    Department of Agronomy, Tay Bac University, Son La 360000, Vietnam)

  • Sung Jin Kim

    (Department of Horticultural Science, Chungnam National University, Daejeon 34134, Korea)

  • Gwon Jeong Bok

    (Department of Horticultural Science, Chungnam National University, Daejeon 34134, Korea)

  • Jong Won Lee

    (Department of Horticulture Environment System, Korea National College of Agriculture and Fisheries, Jeonju 54874, Korea)

  • Jong Seok Park

    (Department of Horticultural Science, Chungnam National University, Daejeon 34134, Korea)

Abstract

Plants respond to root temperature stresses by producing antioxidants as a defense mechanism. Since a number of these are phytochemicals with enhancing effects on human health, we examined the effects of 4 root-zone temperature (RZT) treatments (10, 20, 28, and 36 °C) on plant growth and the main bioactive compound concentrations in each organ of Agastache rugosa plants. We aimed to determine the optimal RZT treatment to increase bioactive compound concentrations with no deleterious effects on plant growth. Four-week-old seedlings were grown in a plant factory for 32 days. Nine plant growth parameters, namely, shoot and root fresh weights, stem and root lengths, leaf length and leaf width, leaf area, and shoot and root dry weights were significantly decreased at 10 and 36 °C compared with other treatments. A similar pattern was observed for the chlorophyll content and leaf gas exchange parameters. Of all the RZT treatments, RZT at 28 °C produced the significantly greatest accumulation of two major bioactive compounds, namely, rosmarinic acid (RA) and tilianin contents per the A. rugosa plant, and had no adverse effects on the overall growth of A. rugosa . This supports the use of 28 °C RZT to successfully improve the bioactive compounds with no adverse influence on plant growth or yield.

Suggested Citation

  • Vu Phong Lam & Sung Jin Kim & Gwon Jeong Bok & Jong Won Lee & Jong Seok Park, 2020. "The Effects of Root Temperature on Growth, Physiology, and Accumulation of Bioactive Compounds of Agastache rugosa," Agriculture, MDPI, vol. 10(5), pages 1-15, May.
    • Handle: RePEc:gam:jagris:v:10:y:2020:i:5:p:162-:d:356680
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    Cited by:

    1. Vu Phong Lam & Mun Haeng Lee & Jong Seok Park, 2020. "Optimization of Indole-3-Acetic Acid Concentration in a Nutrient Solution for Increasing Bioactive Compound Accumulation and Production of Agastache rugosa in a Plant Factory," Agriculture, MDPI, vol. 10(8), pages 1-14, August.

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