In this study, microwave-plasma lamps (MPL) that emit sun-like light were tested. Plant cultivation experiments using potted roses were conducted with supplemented assimilation light in greenhouse and climate chamber to investigate the influence of artificial sunlight on external and internal plant quality. Light from high-pressure sodium lamps (HPS) was used as a reference. Plant growth parameters were recorded, and the chlorophyll and flavonoid contents in rose leaves were determined. Furthermore, the photosynthetic rate and soluble sugar content were measured in the climate chamber. Potted roses grown under MPL light showed one week earlier flowering but displayed reduced branching and consequently, a lower number of flowers and buds compared with plants grown under HPS light. Photosynthesis rate at growth light intensity of leaves grown in climate chamber was increased in potted roses under MPL light, whereby the content of fructose and glucose was not significant different.
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