Growth, Physiology and Nutritional Quality of C4 Halophyte Portulaca oleracea L. Grown Aeroponically in Different Percentages of Artificial Seawater under Different Light-Emitting Diode Spectral Qualities

Edible halophyte Portulaca oleracea L., known as purslane, was grown in two percentages of artificial seawater (ASW) under two combined red (R) and blue (B) LED spectra. High salinity (40% ASW) negatively affected shoot productivity and leaf growth of purslane compared to those grown in 10% ASW. Pho...

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Bibliographic Details
Published in:Plants (Basel) 2023-09, Vol.12 (18), p.3214
Main Authors: He, Jie, Leng, Su Yee, Qin, Lin
Format: Article
Language:English
Subjects:
Aeroponics
Antioxidants
Artificial seawater
C4 halophyte
Efficiency
Enzymes
Food security
Halophytes
LED light qualities
Light emitting diodes
light use efficiency
Metabolism
Nitrate reductase
Nitrates
nitrogen metabolism
nutritional quality
Nutritive value
Parameters
Phenolic compounds
Phenols
Photochemistry
Physiology
Portulaca oleracea
Productivity
Ratios
Reductases
Salinity
Salinity effects
Seawater
Spectral emittance
yield
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Summary:Edible halophyte Portulaca oleracea L., known as purslane, was grown in two percentages of artificial seawater (ASW) under two combined red (R) and blue (B) LED spectra. High salinity (40% ASW) negatively affected shoot productivity and leaf growth of purslane compared to those grown in 10% ASW. Photosynthetic pigment and total reduced nitrogen concentrations were significantly higher in purslane grown in 10% ASW than in 40% ASW. However, LED spectral quality did not markedly influence these parameters. Grown in 10% ASW under R/B 2.2, purslane had the highest maximum nitrate reductase activity, while those in 40% ASW under R/B 2.2 had the highest activation state. Under both light qualities, purslane had a sevenfold increase in proline concentration in 40% ASW than in 10% ASW. Total phenolic compounds’ concentration was the highest in 10% ASW under R/B 0.9, while there were no significant differences in the accumulation of total soluble sugars and ascorbic acids among all plants. Antioxidant enzymes activities were lower in 40% ASW under R/B 2.2 compared to the other conditions. In conclusion, salinity affected the yield, physiology and nutritional quality of purslane. The impacts of LED spectral quality on purslane were only reflected by certain physiological and nutritional parameters.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants12183214