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Publication Type J
Authors He, J., X. L. You and L. Qin
Title High Salinity Reduces Plant Growth and Photosynthetic Performance but Enhances Certain Nutritional Quality of C-4 Halophyte Portulaca oleracea L. Grown Hydroponically Under LED Lighting
Source Frontiers in Plant Science
Author Keywords dietary minerals hydroponics LED lighting photosynthesis phytochemicals Portulaca oleracea L crassulacean acid metabolism common ice plant salt stress water relations ion accumulation mesembryanthemum-crystallinum chlorophyll fluorescence antioxidant properties carbon fixation succulent plant
Abstract Portulaca oleracea L. (known as purslane) is one of the most nutritious leafy vegetables owing to its high content of antioxidants. In this study, all plants were grown indoors hydroponically with different NaCl salinities. Photosynthetic photo flux density (PPFD) at 200 mu mol m(-2) s(-1) (12 h) was provided to all plants by LED with red:blue ratio of 2.2. Thirty days after transplanting, plants grown with100 mM NaCl had the highest productivity and the fastest leaf growth followed by those with 0, 200 and 300 mM NaCl. Grown with 300 mM NaCl, purslane had the lowest specific leaf area due to its highest leaf dry matter content and its lowest water content. All plants had similar values of leaf succulence except for those with 300 mM NaCl. Total chlorophyll and carotenoids contents were significantly higher in plants grown with 0 and 100 mM NaCl than with 200, and 300 mM NaCl. All plants had F-v/F-m ratios close to 0.8. However, electron transport rate and Delta F/F-m ' were significantly higher in plants grown with 0 and 100 mM NaCl than with 200 and 300 mM NaCl. CAM-induced purslane with 300 mM NaCl had higher non-photochemical quenching. Maximum net photosynthetic O-2 evolution rate and Cyt b(6)f concentration were significantly lower with 300 mM NaCl compared to all other plants while all plants had similar PS II concentration. Proline concentration increased with increasing salinities. All plants had similar levels of total soluble sugars. Plants grown with 0 and 100 mM NaCl had significantly higher concentrations of NO3-, total reduced nitrogen, total leaf soluble protein, Rubisco protein, total ascorbic acid, and total phenolic compounds than with 200 and 300 mM NaCl. The highest concentrations of K, Ca, and Mg were found in purslane grown under 0 mM NaCl. Statistically, no significant differences in Fe concentrations were observed among all plants. However, salinity seems to increase Fe concentration. In conclusion, it is feasible to grow purslane under 100 mM NaCl as it is the most optimal condition to achieve higher productivity and better quality. However, the production of antioxidants may depend on not only salinity but also other growth conditions.
Author Address [He, Jie; You, Xueli; Qin, Lin] Nanyang Technol Univ, Natl Inst Educ, Singapore, Singapore. He, J (corresponding author), Nanyang Technol Univ, Natl Inst Educ, Singapore, Singapore. jie.he@nie.edu.sg
ISSN 1664-462X
ISBN 1664-462X
29-Character Source Abbreviation Front. Plant Sci.
Publication Date Mar
Year Published 2021
Volume 12
Digital Object Identifier (DOI) 10.3389/fpls.2021.651341
Unique Article Identifier WOS:000636670500001

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