HUMIC SUBSTANCES AND MOISTURE CONTENT IN MEDIA ALTER BIOMASS PRODUCTION AND BIOACTIVE CONSTITUENTS OF THYMUS VULGARIS L.
Humic substances (HS) are a natural product that increase biochemical interactions, and have beneficial effects on soil and growth plant. But it is unknown whether they can be improve the yield and composition of bioactive constituents in thyme (Thymus vulgaris L.). To test the effect of these substances, thyme seedlings were obtained from seeds growing under different doses of HS from a commercial product: 100, 200, 300 and 400 mg/L. Thyme plants were grown using three moisture levels 20, 40, 60% of pot capacity. Changes in plant growth were determined in terms of height of plant, fresh and dry matter. The bioactive constituents were determined in terms of yield and composition of essential oils, antioxidant activity, total phenolic content and flavonoids. Morphological variables showed significant differences (P≤0.05) among source variation, except to the fresh weight of the aerial part. The essential oil yield and composition were dependent of moisture percent and HS supplied. In general, the antioxidant activity, total phenol content and total flavonoids were modified by water content and HS levels supplied.
Juárez-Rosete, C.R., Craker, L.E., Rodríguez-Mendoza, M.N. and Aguilar-Castillo, J.A. (2012). HUMIC SUBSTANCES AND MOISTURE CONTENT IN MEDIA ALTER BIOMASS PRODUCTION AND BIOACTIVE CONSTITUENTS OF THYMUS VULGARIS L.. Acta Hortic. 947, 301-305
plant nutrition, water content, growth, yield