Abstract

PENARANDA, Juan C et al. Variation in concentration of flavonoids and chlorophyll, and changes on morphology and foliar anatomy, due to visible (PAR) or ultraviolet (UVA, UVB) radiation in Baccharis Latifolia  . Rev. Bol. Quim [online]. 2020, vol.37, n.5, pp.210-222. ISSN 0250-5460.

Abstract Baccharis latifolia is a plant of medicinal and industrial interest with an abundance of flavonoids within its leaves. The present study focused on identifying the changes in total flavonoids, chlorophyll concentration, plant growth, and leaf anatomy at different wavelengths (UVA, UVB and PAR) under controlled conditions. Statistical analyzes were carried out using nonparametric Kruskal-Wallis and post hoc Bonferroni tests. The results suggest that favorable conditions for the production of flavonoids occur when exposed to UVB50 treatment (50% UVB with respect to daily solar radiation), while it is observed that low levels of PAR play an important role in reducing the flavonoids. The chlorophyll concentration is favored by PAR and UVA50 treatments; however, it is negatively influenced by UVB100 and UVB150. Vegetative growth does not show strong differences when comparing PAR treatments, however, it does present better results in relation to treatments that include UVA or UVB radiation. The foliar anatomy shows strong differences between the treatments and is favored mainly by the UVA100 and UVA150 treatments, while it is negatively affected by the UVB100 and UVB150. The observed results show that Baccharis latifolia is a plastic species that can accommodate various levels of light and wavelength, however, it presents differentiated responses in growth, physiology and foliar anatomy that affect the concentration of compounds.

Keywords : Baccharis latifolia; UV; PAR; Total flavonoids; Chlorophyll.

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