Indução de metabólitos secundários em plântulas de Hypericum brasiliense Choisy crescendo in vitro

Abstract

A produção de rutina, quercetina, 1,5-diidroxixantona e ácido betulínico foi investigada em plântulas de H. brasiliense crescendo in vitro, sob a influência de ácido salicílico, polietilenoglicol, NaCl, 24-epibrassinolídeo, benzotiadiazole (BION), metiljasmonato e concentrações aumentadas de boro e nitrogênio no meio líquido de cultura. As avaliações foram feitas após 5 e 10 dias do início dos tratamentos. Os maiores aumentos de conteúdo foram observados com quercetina para boro e ácido salicílico aos 5 dias, e 24-epibrassinolídeo e BION aos 10 dias. PALAVRAS-CHAVE:Ácido betulínico, Quercetina, Rutina, Xantona. Induction of secondary metabolites in plantlets of Hypericum brasiliense Choisy in vitro ABSTRACTThe production of rutin, quercetin, 1,5-dihydroxyxanthone and betulinic acid was investigated in plantlets of H. brasieliense in vitro, and exposed to salycilic acid, poliethylene glycol, NaCl, 24-epibrassinolide, benzothiadiazole (BION), methyljasmonate and increased concentrations of boron and nitrogen in the liquid culture medium. Evaluations of the contents were carried out after 5 and 10 days of treatments. The highest increase was observed in quercetin in the salycilic acid and B treatments after 5 days of exposure, and in 24-epibrassinolide and BION after 10 days.

Impact of Salinity on Quality and Post-Harvest Conservation of Gherkin (Cucumis anguria L.)

“…Even though Velloso et al (2009), andCroteau et al (2000) reported that biotic and abiotic factors, such as hormones, light, lack of nutrient, and water stress may promote an increase in total phenolic levels, this study did not show effect on total phenolic levels of gherkin with increasing levels of salinity up to 5.0 dS m -1…”

Water Stress and Agriculture

“…Increase of hypericin and betulinic acid levels upon Hypericum brasiliense Choisy exposure to drought represents an antioxidant response to ROS production [57,58]. Artemisia annua plants tolerate well water deficit treatments showing increased accumulation of artemisinin, a potent anti-parasitic drug, as proved in greenhouse experiments.…”