Óleos essenciais sobre a qualidade de sementes de leucena

Abstract

<span class="fontstyle0">Leucena (Leucaena leucocephala) is an alternative used for animal feeding in the Northeastern of Brazil due to its resistance to drought and its high nutritional value. They are forest species whose seeds are affected by fungi that cause abnormalities and damage to seedlings, seed deterioration. The objective of this study was to evaluate the efficiency of essential oils in reducing the incidence of fungi associated with L. leucocephala seeds and their interference with physiological quality. The treatments were the following: essential oils of Cymbopogon nardus, Boswellia carteri, Eucalyptus globulus, Helianthus annuus, Vitis vinifera seeds, Eugenia caryophyllata, Melaleuca alternifolia and Rosmarinus officinalis in a concentration of 1 mL · L</span><span class="fontstyle0">-1 </span><span class="fontstyle0">and fungicide, using 100 seeds per treatment.In order to overcome dormancy scarification with sandpaper Nº 100 in the opposite region to the micropile. The sanitary quality of the seeds was made with the incubation method in Petri dishes containing double layer of filter paper moistened with ADE. Seed physiological quality was determined based on seed germination, emergence and vigor tests. The experimental design was completely randomized with ten treatments. Eucalyptus, clove and Melaleuca alternifolia essential oils reduced the incidence percentage of fungi associated with leucena seeds. Melaleuca alternifolia essential oil reduced the physiological quality of leucena seeds.</span> <br /><br />

BIOACTIVE COMPOUNDS IN DIASPORES OF Astronium urundeuva (M.Allemão) Engl. FOR QUALITY MAINTENANCE DURING STORAGE

“…The activity of different essential oils was evaluated and the essential oil of melaleuca (M. alternifolia) reduced the physiological quality of leucena (Leucaena leucocephala (Lam.) de Wit) seeds (OLINTO et al, 2021). The higher the concentration of allelochemicals, the lower the germination and vigor levels of rice (Oryza sativa L.) seeds (KHATRI et al, 2020).…”

“…Unlike seeds of commercialized cultivars, there is no record of fungicides recommended for the treatment of forest species (COIMBRA et al, 2014). Therefore, it is necessary to look for alternatives of control, and the use of bioactive compounds is one of the options (OLINTO et al, 2021).…”

“…Bioactive compounds from plants pose no risks to ecosystems and are an alternative to the use of synthetic chemicals (NMON; AJURU, 2020). The use of secondary compounds produced by plants, due to antifungal potential, is an alternative for pathogen control (KOUASSI et al, 2017;ARAÚJO et al, 2019;OLINTO et al, 2021), as they are economically viable and environmentally correct.…”

Health and germination of Mimosa scabrella seeds submitted to treatment with essential oils

“…Oliveira et al (2016) verificaram que o óleo essencial de cravo-da-índia inibiu em torno de 82% da germinação e alongamento da radícula e hipocótilo da dormideira (Mimosa pudica) e mato pasto (Senna obtusifolia). Efeito negativo também foi relatado por Olinto et al (2021). Esses autores avaliaram a qualidade fisiológica de sementes de leucena (Leucaena leucocephala) e observaram que o óleo essencial de Melaleuca alternifolia diminuiu a emergência de plântulas de leucena, como também contribuiu para a redução da velocidade de emergência das sementes, apesar de reduzir o percentual de incidência de fungos.…”