Potential Use of Colored LED Lights to Increase the Production of Bioactive Metabolites Hedyotis corymbosa (L.) Lam.

Anh Tuan Le,Gyung-Deok Han,Yong-Suk Chung,Ju-Kyung Yu,Thuong Kiet Do

doi:10.3390/plants11020225

Abstract

Hedyotis corymbosa (L.) Lam is a wild herb that is used in traditional Indian, Chinese, and African medicine. Light-emitting diode (LED) technology is paving the way to enhance crop production and inducing targeted photomorphogenic, biochemical, or physiological responses in plants. This study examines the efficiency of H. corymbosa (L.) Lam production under blue 450 nm and red 660 nm LED lights for overall plant growth, photosynthetic characteristics, and the contents of metabolite compounds. Our research showed that blue LED lights provided a positive effect on enhancing plant growth and overall biomass. In addition, blue LED lights are more effective in controlling the production of sucrose, starch, total phenolic compounds, and total flavonoid compared to red LED lights. However, blue and red LED lights played essential but different roles in photosynthetic characteristics. Our results showed the potential of colored LED light applications in improving farming methods and increasing metabolite production in herbs.

Highlights

Hedyotis corymbosa (L.) Lam, a synonym of Oldenlandia corymbosa (L.) Lam, is a wild herb in the Rubiaceae family and is an annual plant that can be erect or prostrate and is sparsely branched
The experiments of H. corymbosa (L.) Lam were conducted under three different light conditions: monochromatic red Light-emitting diode (LED) 660 nm (R), blue LED 450 nm (B), and a fluorescent lamp (FL)
The blue LED light had the highest effect on stomatal aperture, Hill reaction activity, and respiratory rate comparatively, but no different effects were detected between the red LED light and FL (Table 1)

Summary

Introduction

Hedyotis corymbosa (L.) Lam, a synonym of Oldenlandia corymbosa (L.) Lam, is a wild herb in the Rubiaceae family and is an annual plant that can be erect or prostrate and is sparsely branched. It is widely distributed throughout the tropical regions of America, Africa, Asia, and the islands of the western Pacific [1]. Various technologies are applied to pursue it, such as tissue and cell culture, precursor feeding, and elicitation treatments [8] The treatments, such as using methyl jasmonate (elicitors), sugar (induction of osmosis), polyethylene glycol (PEG)

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