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Mr. Mengzhao Wang
Department of Horticulture, Division of Applied Life Science (BK21 Plus Program), Graduate School of Gyeongsang National University

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Research Keywords & Expertise

0 Horticulture
0 Hydroponics
0 Plant Factory
0 Tissue Culture
0 Greenhouse crop production

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Short Biography

A Ph.D. student at Gyeongsang National University, majored in horticulture.

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Journal article
Published: 19 March 2021 in International Journal of Molecular Sciences
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Plants are exposed to numerous biotic and abiotic stresses, and light is one of the most important factors that influences the plant morphology. This study was carried out to examine how the lighting direction affected the plant morphology by investigating the growth parameters, epidermal cell elongation, stomatal properties, and physiological changes. Seedlings of two head lettuce (Lactuca sativa L.) cultivars, Caesar Green and Polla, were subjected to a 12 h photoperiod with a 300 μmol·m−2·s−1 photosynthetic photon flux density (PPFD) provided by light emitting diodes (LEDs) from three directions: the top, side, and bottom, relative to the plants. Compared with the top and side lighting, the bottom lighting increased the leaf angle and canopy by stimulating the epidermal cell elongation in leaf midrib, reduced the leaf number and root biomass, and induced large stomata with a low density, which is associated with reduced stomatal conductance and carbohydrate contents. However, the proline content and quantum yield exhibited no significant differences with the different lighting directions in both cultivars, which implies that the plants were under normal physiological conditions. In a conclusion, the lighting direction had a profound effect on the morphological characteristics of lettuce, where the plants adapted to the changing lighting environments.

ACS Style

MengZhao Wang; Hao Wei; Byoung Jeong. Lighting Direction Affects Leaf Morphology, Stomatal Characteristics, and Physiology of Head Lettuce (Lactuca sativa L.). International Journal of Molecular Sciences 2021, 22, 3157 .

AMA Style

MengZhao Wang, Hao Wei, Byoung Jeong. Lighting Direction Affects Leaf Morphology, Stomatal Characteristics, and Physiology of Head Lettuce (Lactuca sativa L.). International Journal of Molecular Sciences. 2021; 22 (6):3157.

Chicago/Turabian Style

MengZhao Wang; Hao Wei; Byoung Jeong. 2021. "Lighting Direction Affects Leaf Morphology, Stomatal Characteristics, and Physiology of Head Lettuce (Lactuca sativa L.)." International Journal of Molecular Sciences 22, no. 6: 3157.

Journal article
Published: 18 August 2020 in Agronomy
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Carnation (Dianthus caryophyllus L.) is a major floricultural crop, cultivated widely for cut flowers. This study was conducted to determine the optimal supplementary light source for the cutting propagation of carnation ‘Dreambyul’ cuttings. Terminal cuttings were propagated in a glasshouse with an average of 260 µmol·m−2·s−1 photosynthetic photon flux density (PPFD) coming from the sun (the control), supplemented with one of three artificial light sources: mixed (red: blue: white = 6:1:1) light-emitting diodes (LED-mix), metal halide (MH) lamps, or high-pressure sodium (HPS) lamps. The supplementary light was provided from 7:00 to 17:00 h at 100 µmol·m−2·s−1 PPFD during propagation. The cuttings were kept on a fogged bench in a glasshouse for 25 days with 24/15 °C day/night temperatures and 88% relative humidity. Compared with the control, better root formation was observed from cuttings grown under the supplementary lights after 10 days. After 25 days of propagation, MH significantly increased the root length, root number, root fresh and dry weights, and shoot biomass, shoot length, and shoot fresh and dry weights. The best root ball formation and the highest root activities were also found in cuttings propagated with supplementary MH light. Supplementary light increased the plant temperature, quantum yield, stomatal conductance, and the contents of chlorophyll, soluble proteins, and carbohydrates. Overall, the root formation and development of carnation ‘Dreambyul’ cuttings were significantly promoted by the three supplementary light sources. Of the three, MH was identified as the optimal supplementary light source.

ACS Style

MengZhao Wang; Jie Xiao; Hao Wei; Byoung Ryong Jeong. Supplementary Light Source Affects Growth and Development of Carnation ‘Dreambyul’ Cuttings. Agronomy 2020, 10, 1217 .

AMA Style

MengZhao Wang, Jie Xiao, Hao Wei, Byoung Ryong Jeong. Supplementary Light Source Affects Growth and Development of Carnation ‘Dreambyul’ Cuttings. Agronomy. 2020; 10 (8):1217.

Chicago/Turabian Style

MengZhao Wang; Jie Xiao; Hao Wei; Byoung Ryong Jeong. 2020. "Supplementary Light Source Affects Growth and Development of Carnation ‘Dreambyul’ Cuttings." Agronomy 10, no. 8: 1217.

Journal article
Published: 02 March 2020 in Agronomy
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Insufficient exposure to light in the winter may result in a longer production periods and lower quality of seedlings in greenhouses for plug growers. Supplementary artificial lighting to plug seedlings may be one solution to this problem. The objective of this study was to assess the effects of the duration of the supplementary light on the growth and development of two watermelon cultivars, ‘Speed’ and ‘Sambok Honey’ grafted onto ‘RS-Dongjanggun’ bottle gourd rootstocks (Lagenaria siceraria Stanld). Seedlings were grown for 10 days in a glasshouse with an average daily natural light intensity of 340 μmol·m−2·s−1 photosynthetic photon flux density (PPFD) and daily supplementary lighting of 8, 12 or 16 h from mixed LEDs (W1R2B1, chip ratio of white:red:blue = 1:2:1) at a light intensity of 100 μmol·m−2·s−1 PPFD, a group without supplementary light was set as the control (CK). The culture environment in a glasshouse had 25/15 °C day/night temperatures, an 85 ± 5% relative humidity, and a natural photoperiod of 8 h. The results showed that all the growth and development parameters of seedlings grown with supplementary light were significantly greater than those without supplementary light (CK). The 12 and 16 h supplementary light resulted in greater growth and development parameters than the 8 h supplementary light did. The same trend was also found with the indexes that reflect the quality of the seedlings, such as the dry weight ratio of the shoot and root, total biomass, dry weight to height ratio of scions, and specific leaf weight. The 12 h and 16 h light supplements resulted in greater Dickson’s quality indexes compared to the 8 h supplementary light, and the 12 h supplementary light showed the greatest use efficiency of the supplementary light. 16 h of daily supplementary light significantly increased the H2O2 content and the antioxidant enzyme activities in seedlings compared to the other treatments. This indicated that 16 h of supplementary light led to certain stresses in watermelon seedlings. In conclusion, considering the energy consumption, 12 h of supplementary light was the most efficient in improving the quality of the two cultivars of grafted watermelon plug seedlings.

ACS Style

Hao Wei; MengZhao Wang; Byoung Ryong Jeong. Effect of Supplementary Lighting Duration on Growth and Activity of Antioxidant Enzymes in Grafted Watermelon Seedlings. Agronomy 2020, 10, 337 .

AMA Style

Hao Wei, MengZhao Wang, Byoung Ryong Jeong. Effect of Supplementary Lighting Duration on Growth and Activity of Antioxidant Enzymes in Grafted Watermelon Seedlings. Agronomy. 2020; 10 (3):337.

Chicago/Turabian Style

Hao Wei; MengZhao Wang; Byoung Ryong Jeong. 2020. "Effect of Supplementary Lighting Duration on Growth and Activity of Antioxidant Enzymes in Grafted Watermelon Seedlings." Agronomy 10, no. 3: 337.

Journal article
Published: 28 September 2018 in Agronomy
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Supplementary lighting is commonly used in high-quality seedling production. In this study, grafted tomato seedlings were grown for 10 days in a glasshouse with 16-h daily supplementary lighting at 100 μmol·m−2·s−1 PPFD (Photosynthetic photon flux density) from either high-pressure sodium (HPS), metal halide (MH), far-red (FR), white LEDs (Light emitting diodes) (W), or mixed LEDs (W1R2B1, where the subscript numbers indicate the ratio of the LED chips) to determine which light sources improve the seedling quality. The control seedlings did not receive any supplementary light. Physiological parameters and the expression of genes related to photosynthesis were analyzed. The results showed that root length, biomass, number of leaves, chlorophyll (SPAD), scion dry weight to height ratio (WHR), and specific leaf weight (SLW) were the greatest for grafted seedlings grown in W1R2B1. The level of root ball formation was the greatest for seedlings grown in W1R2B1, followed by those grown in W, HPS, and MH. Seedlings grown in FR did not fare well, as they were very thin and weak. Moreover, the expression of two photosynthetic genes (PsaA and PsbA) was significantly increased by W1R2B1 and W, which suggests that the plastid or nuclear genes might be regulated. The overall results suggest that W1R2B1 was the most suitable light source to enhance the quality of grafted tomato seedlings. The results of this study could be used as a reference for seedling production in glasshouses, and may provide new insights in the research on lights affecting the development of plants.

ACS Style

Hao Wei; Jiangtao Hu; Chen Liu; MengZhao Wang; Jin Zhao; Dong Il Kang; Byoung Ryong Jeong. Effect of Supplementary Light Source on Quality of Grafted Tomato Seedlings and Expression of Two Photosynthetic Genes. Agronomy 2018, 8, 207 .

AMA Style

Hao Wei, Jiangtao Hu, Chen Liu, MengZhao Wang, Jin Zhao, Dong Il Kang, Byoung Ryong Jeong. Effect of Supplementary Light Source on Quality of Grafted Tomato Seedlings and Expression of Two Photosynthetic Genes. Agronomy. 2018; 8 (10):207.

Chicago/Turabian Style

Hao Wei; Jiangtao Hu; Chen Liu; MengZhao Wang; Jin Zhao; Dong Il Kang; Byoung Ryong Jeong. 2018. "Effect of Supplementary Light Source on Quality of Grafted Tomato Seedlings and Expression of Two Photosynthetic Genes." Agronomy 8, no. 10: 207.