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Open AccessArticle

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

1
Department of Horticultural Science, Chungnam National University, Daejeon 34134, Korea
2
Department of Agronomy, Tay Bac University, Son La 360000, Vietnam
3
Department of Horticulture Environment System, Korea National College of Agriculture and Fisheries, Jeonju 54874, Korea
*
Author to whom correspondence should be addressed.
Agriculture 2020, 10(5), 162; https://doi.org/10.3390/agriculture10050162
Received: 3 April 2020 / Revised: 5 May 2020 / Accepted: 9 May 2020 / Published: 11 May 2020
(This article belongs to the Special Issue Plant Environmental Stress Physiology and Metabolism)
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. View Full-Text
Keywords: acacetin; chlorophyll content; plant growth; rosmarinic acid; tilianin acacetin; chlorophyll content; plant growth; rosmarinic acid; tilianin
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MDPI and ACS Style

Lam, V.P.; Kim, S.J.; Bok, G.J.; Lee, J.W.; Park, J.S. The Effects of Root Temperature on Growth, Physiology, and Accumulation of Bioactive Compounds of Agastache rugosa. Agriculture 2020, 10, 162.

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