Efeito da variação sazonal no potencial alelopático de Sálvia

Abstract

ResumoA biossíntese e o acúmulo dos compostos químicos que conferem a característica alelopática em Salvia officinalis L. (Lamiaceae) são resultantes do metabolismo secundário do vegetal. O presente trabalho teve como objetivo analisar os efeitos alelopáticos de extratos aquosos de folhas frescas de Sálvia coletadas durante as estações do ano, obtidos por decocção, maceração estática, infusão e trituração sobre a germinação e o desenvolvimento de plântulas de alface (Lactuca sativa L.), totalizando 20 tratamentos nas concentrações 0; 7,5; 15; 22,5 e 30%. Os resultados obtidos foram submetidos ao teste de Tukey, ao nível de 5% de probabilidade. As variáveis avaliadas, porcentagem de germinação, índice de velocidade de germinação (IVG), crescimento da parte aérea e das raízes e formação de plântulas anormais não apresentaram um padrão de resposta alelopática nas diferentes estações do ano, indicando possível alteração no metabolismo vegetal em função da variação sazonal presente no ambiente da planta em estudo. Palavras-chave: Salvia officinalis L, Lactuca sativa L, extratos aquosos AbstractThe biosynthesis and the accumulation of the chemical composites that have allelopathy characteristics in Salvia officinalis L. (Lamiaceae) are resulting from the secondary plant metabolism. The present work had as objective to analyze the allelopathic effects of aqueous extracts of fresh leaves of Sálvia collected during the seasons, obtained by decoction, static infusion and grinding, on the germination and development of seedlings of lettuce (Lactuca sativa L.). The experiment had 20 treatments (concentrations 0; 7.5; 15; 22.5 and 30%). The results had been submitted to the Tukey test, to the level at 5% probability. The appraised variables, germination percentage, the germination speed index (GSI), the growth of shoot and roots and abnormality formation of seedlings did not present a pattern of allelopathy in the different seasons, indicating a possible alteration in the plant metabolism in function of the seasonal variation in the plant ambient.

Evaluation of the allelopathic, genotoxic, and antiproliferative effect of the medicinal speciesPsychotria brachypodaandPsychotria birotula(Rubiaceae) on the germination and cell division ofEruca sativa(Brassicaceae)

“…Many medicinal species have been tested for their allelopathic effect, among them Leucaena leucocephala (Lam.) (Prates et al 2000), Cymbopogon citratus (DC) Stapf., Stevia rebbaudiana (Bert) (Souza et al 2005), Arctium minus (Hill) Bernh (Belinelo et al 2008), Solanum lycocarpum A. St-Hil, Solanum subumbellatum Vell., Solanum granuloso-leprosum Dunal (Oliveira 2009), Ruta graveolens L. (De Feo et al 2002), Salvia officinalis L. (Viecelli and Cruz-Silva 2009), and Vernonia tweediana Baker (Olguin et al 2005).…”

<b>Allelopathic bioactivity of fresh and infused aqueous extracts of Brazilian cherry (<i>Eugenia uniflora</i> L.) on lettuce and maize

“…Fluctuation between stimulatory and inhibitory responses, depending on the extraction methods and the extract concentration, has also been observed by Pelegrini and Cruz-Silva (2012) in Coleus barbatus (A.) Benth extracts, and by Viecelli and Cruz-Silva (2009) in Salvia officinalis L. extracts. A stimulatory effect on the initial development of lettuce has also been reported as a result of treatment with Eugenia dysenterica Mart.…”

Alelopatic Effects of Tectona grandis L.F. in the Germination and Initial Development of Lettuce (Lactuca sativa L.)

“…The results are presented in Table 2. jas.ccsenet. Viecelli and Cruz-Silva (2009) found that different dosages of aqueous extract of Salvia officinalis L. leaves, interfered significantly in the variable SGI and the initial development of lettuce seedlings submitted to the high concentrations of the extract. Silva et al (2015) analyzing extracts of leaves of the species of the Lamiaceae's family, verified that aqueous extracts made from Mentha sp.…”