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37 results on '"Han, Gyung Deok"'

20. Colored LED Lights: Use One Color Alone or with Others for Growth in Hedyotis corymbosa In Vitro?

Author

Le, Anh Tuan, Choi, In-Lee, Han, Gyung-Deok, Kang, Ho-Min, Jung, Dae Ho, Park, Won-Pyo, Yildiz, Mehtap, Do, Thuong Kiet, and Chung, Yong Suk

Subjects
LIGHT emitting diodes, AGRICULTURAL productivity, PRODUCTION control
Abstract

In recent years, light-emitting diode (LED) technology has been applied to improve crop production and induce targeted biochemical or physiological responses in plants. This study investigated the effect of different ratios of blue 450 nm and red 660 nm LEDs on the overall plant growth, photosynthetic characteristics, and total triterpenoid production in the leaves of Hedyotis corymbosa in vitro plants. The results showed that a high proportion of blue LED lights had a positive effect on enhancing photosynthesis and the overall biomass. In addition, blue LED lights were shown to be more effective in controlling the production of the total triterpenoid content compared with the red LED lights. Moreover, it was also found that plants grown under a high proportion of red LEDs exhibited reduced photosynthetic properties and even induced damage to the photosynthetic apparatus, which indicated that the blue or red LED lights played contrary roles in Hedyotis corymbosa. [ABSTRACT FROM AUTHOR]

Published
2023
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24. What Traits Should Be Measured for Biomass in Kenaf?

Author

Kim, Jaeyoung, primary, Han, Gyung Deok, additional, Muthukathan, Gopi, additional, Rodrogues, Renato, additional, Hyun, Do Yoon, additional, Kim, Seong-Hoon, additional, Yu, Ju-Kyung, additional, Park, Jieun, additional, Yoo, Soo-Cheul, additional, and Chung, Yong Suk, additional

Published
2021
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25. Antifungal Activity of Thymol against Aspergillus awamoriand Botrytis acladaIsolated from Stored Onion Bulbs

Author

Oh, Ji Yeon, Sajidah, Siti, Volynchikova, Elena, Kim, Yu Jin, Han, Gyung Deok, Sang, Mee Kyung, and Kim, Ki Deok

Abstract

AbstractThe antifungal activity of thymol against Aspergillus awamoriF23 and Botrytis acladaF15 in onions was examined through direct treatment with amended media and gaseous treatment with I-plates (plastic plates containing central partitions). The protective and curative control efficacy of thymol was examined 24 h before and after the inoculation of onion bulbs with the fungal isolates. Mycelial growth, sporulation, and spore germination of the isolates were inhibited on potato dextrose agar amended with various concentrations of thymol or acetic acid (positive control). Overall, thymol produced a stronger inhibitory effect on the mycelial growth and development of the isolates than acetic acid. Following gaseous treatment in I-plates, mycelial growth, sporulation, and spore germination of the isolates were inhibited at higher concentrations of thymol or acetic acid; however, acetic acid showed a little effect on the sporulation and spore germination of the isolates. Following the treatment of onion bulbs with 1000 mg L−1of thymol 24 h before and after fungal inoculation, lesion diameter was greatly reduced compared with that following treatment with 0.5% ethanol (solvent control). Onion bulbs sprayed with thymol 24 h before fungal inoculation generally showed reduced lesion diameters by isolate F23 but not in isolate F15 compared with those sprayed 24 h after fungal inoculation. Collectively, thymol effectively inhibited the growth and development of A. awamoriand B. acladaon amended media and in I-plates. In addition, spraying or fumigation of thymol is more desirable for effectively controlling these postharvest fungal pathogens during long-term storage conditions.

Published
2022
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37. Chlorine dioxide enhances lipid peroxidation through inhibiting calcium-independent cellular PLA 2 in larvae of the Indianmeal moth, Plodia interpunctella.

Author

Han GD, Na J, Chun YS, Kumar S, Kim W, and Kim Y

Subjects
Animals, Larva drug effects, Larva metabolism, Moths metabolism, Chlorine Compounds toxicity, Insecticides toxicity, Lipid Peroxidation drug effects, Moths drug effects, Oxides toxicity, Phospholipases A2 metabolism
Abstract

Polyunsaturated fatty acids usually undergo lipid peroxidation induced by reactive oxygen species (ROS). Calcium-independent cellular phospholipase A 2 (iPLA 2 ) can maintain fatty acid compositions in phospholipids depending on physiological conditions. An insect iPLA 2 (Pi-iPLA 2 ) was predicted from the transciptome of the Indianmeal moth, Plodia interpunctella. It encodes 835 amino acids. It possesses five ankyrin repeats in the N terminal and patatin lipase domain in the C terminal. Pi-iPLA 2 was expressed in all developmental stages of the Indianmeal moth. In the larval stage, it was expressed in all tissues tested. RNA interference (RNAi) specific to Pi-iPLA 2 was performed using specific double-stranded RNA (dsRNA). It resulted in almost 70% of reduction in gene expression. Under such RNAi condition, P. interpunctella exhibited significant accumulation of lipid peroxidation based on the amount of malondialdehyde. RNAi of Pi-PLA 2 expression also impaired cellular immune response of P. interpunctella. Chlorine dioxide (ClO 2 ), an insecticidal agent by generating ROS, increased lipid peroxidation in a dose-dependent manner. However, the addition of vitamin E (an antioxidant) reduced the formation of lipid peroxidation. ClO 2 treatment significantly reduced expression of Pi-iPLA 2 but increased lipid peroxidation in larval fat body of P. interpunctella. Furthermore, larvae treated with dsRNA specific to Pi-iPLA 2 were significantly susceptible to ClO 2 treatment. These results suggest that Pi-iPLA 2 plays a crucial role in repairing damaged fatty acids from phospholipids. Our results also suggest that ClO 2 can elevate lipid peroxidation through inhibiting Pi-iPLA 2 expression in addition to direct ROS production., (Copyright © 2017 Elsevier Inc. All rights reserved.)

Published
2017
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