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Greenhouse Photoluminescent PMMA Panels Improve the Agronomical and Physiological Performances of Lettuce (Lactuca sativa L.)


IDA Di Mola CONTI Stefano BARTÁK Miloš COZZOLINO Eugenio OTTAIANO Lucia GIORDANO Davide MELCHIONNA Giuseppe MORMILE Pasquale RIPPA Massimo BELTRAME Luca EL-NAKHEL Christophe CORRADO Giandomenico ROUPHAEL Youssef MORI Mauro

Rok publikování 2022
Druh Článek v odborném periodiku
Časopis / Zdroj Horticulturae
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Klíčová slova rare-earth elements; photoluminescence; greenhouse cover; doped poly-methyl methacrylate; chlorophyll fluorescence; NPQ
Popis Supplementary lighting of specific wavelengths can be used for inducing morphological and physiological responses in different crops, ultimately improving yield and quality. Based on this approach, new greenhouse covering materials are being developed in order to improve the use of sunlight in horticulture. These new-generation greenhouse coverings may incorporate light spectrum modulation agents or fluorescent additives which convert solar UV radiation into visible light. In this work, we tested the agronomical and physiological response of lettuce grown under a greenhouse covered with poly-methyl-methacrylate (PPMA) panels doped with a blend of the rare-earth inorganic material with a photo-luminescent effect. The doped greenhouse elicited a 36% increase in lettuce yield compared to the undoped greenhouse. Chlorophyll and carotenoid content, as well as antioxidant activity and ascorbic acid content, were not affected by greenhouse cover, but the doped panels induced a 22% reduction in total phenolics and a 14% increase in nitrate content in leaves. The greenhouse covering materials also affected the photochemistry of photosynthesis, as the daily fluctuations in both the effective quantum yield (?PSII) and the electron transport rate (ETR) were attenuated under the doped greenhouse. Non-photochemical quenching (NPQ) was closely related to the light environment in all experimental conditions, with the highest values at 14:00 h. Our results showed that the red-supplemented light spectrum under the doped greenhouse cover contributed to increased plant growth and yield, with a corresponding effect on the physiology of photosynthesis.

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