Eucalyptus globulus essential oil on the postharvest quality of ‘Carola’ roses

Abstract

The consumer market has been demanding quality plant products, without any contamination or chemical residues, restricting their use in postharvest. As a result, is necessary increase the development of research seeking more sustainable and economic alternatives. The objective was to identify the ideal concentration of eucalyptus essential oil to maintain postharvest quality of ‘Carola’ roses. At laboratory, stems of the ‘Carola’ roses were standardized at 35 cm, labeled and subjected to the following doses of eucalyptus (Eucalyptus globulus) essential oil: 0.25%; 0.5%; 0.75%; 1.0% and 1.25%. Spraying with distilled water was used as a control. The experiment was conducted in a completely randomized design, in a factorial scheme consisting of two factors: six postharvest treatments and seven evaluation dates (0, 1, 2, 3, 4, 5, 6 and 7 days). Four replications were used, with two flowers each. Stems fresh mass and color of the petals were analyzed daily. In addition, the visual quality was also evaluated. The total anthocyanin content in the petals was evaluated every three days at the beginning, middle and end of the experimental period. Eucalyptus essential oil in all doses tested provided better maintenance on the postharvest quality of roses: 0.25% and 0.5% (better grades), 1.0% and 1.25% (lower hue angle) and 0.25% (higher anthocyanin content). On the 5th day, the flower stems lost 16% of fresh mass, without signs of wilting and the assigned scores also indicated that the stems remained fit for commercialization until the fifth day (total vase life). In conclusion, eucalyptus essential oil at doses 0.25%, 0.50%, 1.0% and 1.25% is effective in maintaining the quality of ‘Carola’ roses for up to five days at 25 °C.

Phytochemical Properties and Diverse Beneficial Roles of Eucalyptus globulus Labill.: A Review

“…The essential oil of Eucalyptus is considered to be a good ecological choice for maintaining the vase-life quality of "Carola" roses. This will help to overcome the use of toxic pesticides, as a routine procedure after harvest, of rose growers, which causes an undesirable impact on the environment and humans as well, as it can increase pathogen resistance [87]. In addition, the insecticidal activity of Eucalyptus essential oil has been previously assessed against the housefly [36], Musca domestica L. [38,88], Culexpipiens [37], and Myzuspersicae [66].…”

Longevidade e qualidade de hastes florais de Denphal em soluções conservantes

“…Essa eficiência foi demonstrada em inflorescências da orquídea Oncidium varicosum tratadas com 50 mg L -1 de AgNO3, juntamente com sacarose (5%) e 8-HQC (100 mg L -1 ), onde apresentaram maior longevidade e número de flores abertas (Mattiuz et al, 2015). No caso do Denphal, infere-se que o nitrato de prata provocou fitotoxicidade as hastes florais, que varia em razão da formulação, da concentração e da espécie (Reid, 2002;De et al 2014) O uso de óleo essencial de Eucalyptus globulus a 1% também foi prejudicial para as hastes de Denphal, embora tenha sido eficiente na manutenção da qualidade de hastes de rosas 'Carola' e para folhas de Philodendron (Yonsawad e Teerarak, 2019;Almeida et al, 2020), mostrando que a resposta a este componente é variável entre as espécies. Logo, mesmo que o óleo de eucalipto tenha eficácia como conservante, doses inadequadas podem causar a inibição total da abertura estomática ou mesmo o entupimento dos vasos condutores (Yonsawad e Teerarak, 2019) reduzindo em excesso a transpiração e a translocação da solução conservante na haste.…”

“…Foram realizadas pesquisas com rosas (Manfredini et al, 2017); gengibre ornamental (Mattos et al, 2018) e gérbera (Maia et al, 2019). Dentre os óleos essenciais pesquisados e disponíveis no mercado, o de eucalipto (Eucalyptus globulus) mostrou-se eficiente na manutenção da qualidade de hastes de rosas 'Carola' (Almeida et al, 2020).…”