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Article

Effects of Photoperiod Interacted with Nutrient Solution Concentration on Nutritional Quality and Antioxidant and Mineral Content in Lettuce

College of Horticulture, South China Agricultural University, Guangzhou 510642, China
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Agronomy 2020, 10(7), 920; https://doi.org/10.3390/agronomy10070920
Received: 25 May 2020 / Revised: 16 June 2020 / Accepted: 19 June 2020 / Published: 27 June 2020
(This article belongs to the Special Issue Role of Vertical Farming in Modern Horticultural Crop Production)
The interacted effects of photoperiod and nutrient solution concentrations (NSCs) on nutritional quality and antioxidant and mineral content in lettuce were investigated in this study. There were a total of nine treatments by three photoperiods (12 h/12 h, 15 h/9 h, and 18 h/6 h), with a combination of three NSCs (1/4, 1/2, and 3/4 NSC). The contents of photosynthetic pigment, mineral element, and nutritional quality were markedly affected by the combination of photoperiod and NSC. The highest leaf number and plant weight were found in lettuce under the combination of 18–0.25X. There was a higher content of photosynthetic pigment in treatment of 15-0.25X. Shorter photoperiod (12 h/12 h and 15 h/9 h) and NSC (1/4 and 1/2 NSC) contributed to reduced nitrate contents and higher contents of free amino acid, soluble protein, and vitamin C. Longer photoperiod and lower NSC could increase soluble sugar content. The content of total P, K, and Ca exhibited a similar trend under the combination of photoperiod and NSC, with a higher content at 3/4 NSC under different photoperiods. Lower contents of total Zn and N were found under longer photoperiod. Moreover, higher antioxidant contents, including 2, 2-diphenyl-1-picrylhydrazyl (DPPH), value of ferric-reducing antioxidant power (FRAP), flavonoid, polyphenol, and anthocyanin were observed under shorter photoperiod, with the peak under 12-0.50X. Generally, 12-0.50X might be the optimal treatment for the improvement of the nutritional quality of lettuce in a plant factory that produced high-quality vegetables. View Full-Text
Keywords: photoperiod; nutrient solution; antioxidants; phytochemical; lettuce; biomass photoperiod; nutrient solution; antioxidants; phytochemical; lettuce; biomass
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MDPI and ACS Style

Song, J.; Huang, H.; Song, S.; Zhang, Y.; Su, W.; Liu, H. Effects of Photoperiod Interacted with Nutrient Solution Concentration on Nutritional Quality and Antioxidant and Mineral Content in Lettuce. Agronomy 2020, 10, 920. https://doi.org/10.3390/agronomy10070920

AMA Style

Song J, Huang H, Song S, Zhang Y, Su W, Liu H. Effects of Photoperiod Interacted with Nutrient Solution Concentration on Nutritional Quality and Antioxidant and Mineral Content in Lettuce. Agronomy. 2020; 10(7):920. https://doi.org/10.3390/agronomy10070920

Chicago/Turabian Style

Song, Jiali, Hui Huang, Shiwei Song, Yiting Zhang, Wei Su, and Houcheng Liu. 2020. "Effects of Photoperiod Interacted with Nutrient Solution Concentration on Nutritional Quality and Antioxidant and Mineral Content in Lettuce" Agronomy 10, no. 7: 920. https://doi.org/10.3390/agronomy10070920

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