The germination and growth of Brassica oleracea L. var. capitata f. rubra plantlets under the influence of colored light of different provenance

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Article Title:	The germination and growth of Brassica oleracea L. var. capitata f. rubra plantlets under the influence of colored light of different provenance
Authors:	Mirela Maria Matioc-Precup, Dorina Cachiţă-Cosma
Affiliation:	Faculty of Sciences, University of Oradea, Oradea, Romania Faculty of Natural Sciences,”Vasile Goldiş” Western University, Arad, Romania
Abstract:	In this study we followed comparatively the white and colored (blue, green, yellow and red) light effects emitted by superbright Light-Emitting Diodes (LEDs) and by fluorescent tubes, over the red cabbage seeds germination and the growth of the plantlets generated from theirs embryos. Luminous intensity corresponded at 1200 lx and the lighting regime was of 16 h/24 h. The control version was exposed to natural light, of northern orientation. The highest germination percentages were registered at the seeds illuminated with white light of various origins (97% – natural, 95% – LEDs and 93% fluorescent tubes). Instead, the lowest percentage of germination (81%) was recorded at the variant subjected to yellow fluorescent tubes. The biggest seedlings and the highest values of the dry weight were observed in the group illuminated with green LEDs light, the hypocotyl size being 75% higher and its dry mass 77% greater than those of the control samples, represented by seedlings grown in natural light. The highest dimension and dry weight of the plantlets grown under fluorescent colored lights were found at the red one, due to the increases with 48.8% of the hypocotyl length and with 41.5% of its dry mass. With the decrease of wavelength of light, the hypocotyls’ color intensified, turned from pink to purple, an effect produced regardless of the nature of light.
Keywords:	Brassica oleracea – plantlets – germination – growth – light-emitting diodes -fluorescent light
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*Correspondence:	mirelamatioc@yahoo.com