Postharvest conservation of alstroemeria ‘ajax’ using 1-methylcyclopropene

Abstract

Cut flowers deteriorate quickly and require postharvest technologies to increase their durability, which is usually around 8 days. Due to the scarce information related to postharvest physiology of Alstroemeria cut flowers, this study aimed to verify the best dose of 1-methylcyclopropene (1-MCP) to the postharvest conservation of inflorescences of Alstroemeria cv. Ajax, considering the factors associated with floral senescence and loss of the decorative life. The stems were submitted to four doses of 1-MCP (0; 100; 250; 500 ppb), then placed in containers with distilled water and stored at room temperature (22 ºC). The treatments were performed in triplicate containing three stems per replicate. The evaluations were performed every three days for a total of 12 days of storage. An F test was conducted, and the means were compared by the Tukey test (p≤0.05). Among the applied treatments the dose of 500 ppb of 1-MCP reduces the loss of water of the stems of alstroemerias during the storage period, keeping the petals turgids and the levels of carotenoids and anthocyanins high, however, this was not enough to keep the decorative quality of the flowers, once the 1-MCP did not solve the problems of yellowing of the leaves and floral openning, which are important characteristics for its commercialization.Index terms: Ethylene; longevity; pigments; enzyme activity. RESUMOAs flores de corte se deterioram muito rapidamente e necessitam de tecnologias pós-colheita para aumentar a durabilidade, que é normalmente em torno de 8 dias. Devido às escassas informações relacionadas à fisiologia pós-colheita de flores de Alstroeméria, a presente pesquisa teve como objetivo verificar qual a melhor dose de 1-metilciclopropeno (1-MCP) na conservação pós-colheita de inflorescências de Alstroemeria cv. Ajax, considerando os fatores associados à senescência floral e perda da vida decorativa. As hastes foram submetidas a quatro doses de 1-MCP (0; 100; 250; 500 ppb), posteriormente foram colocadas em recipientes com água destilada e armazenadas em temperatura de ambiente (22 ºC). Os tratamentos foram realizados em triplicata contendo três hastes por repetição. As avaliações foram realizadas a cada três dias perfazendo um total de 12 dias de armazenamento. Foi realizado um teste de F, e as médias comparadas pelo teste de Tukey (P≤0,05). Entre os tratamentos aplicados a dose de 500 ppb de 1-MCP reduziu a perda de água das hastes de alstroeméria durante o período de armazenamento, mantendo as pétalas túrgidas e os níveis de carotenoides e antocianinas altos, entretanto, isso não foi suficiente para manter a qualidade decorativa das flores, uma vez que o 1-MCP não resolveu os problemas de amarelecimento das folhas e abertura floral, que são importantes características para sua comercilização.Termos para indexação: Etileno; longevidade; pigmentos; atividade enzimática.

The Efficacies of 1-Methylcyclopropene and Chitosan Nanoparticles in Preserving the Postharvest Quality of Damask Rose and Their Underlying Biochemical and Physiological Mechanisms

“…Maintaining a higher level of antioxidant activity in damask rose due to 1-MCP in the current investigation was similar to the study of Ma et al [ 14 ], who reported that 1-MCP effectively inhibits the reduction of DPPH radical scavenging activity in apples. Similarly, 1-MCP maintained the TAC in carnations [ 69 ] and TCC in alstroemeria [ 70 ], which support the current results.…”

“…Amplification of the antioxidant machinery due to 1-MCP treatment has been also reported in gladiolus [ 11 ] and carnations [ 69 ]. It has been found that 1-MCP treatment reduced the PPO activity in alstroemeria flowers [ 70 ]. In agreement with our results, 1-MCP treatment increased the activities of antioxidant enzymes such as CAT and APX, while it was associated with lower PPO and LOX activities [ 17 , 87 ].…”

Chlorophyll measurements in Alstroemeria sp. using SPAD-502 meterand the color space CIE L*a*b*, and its validation in foliar senescence

“…Alstroemeria sp. have an average vase life spam of 10 to 21 d, but it faces the problem that leaves of the inflorescence become yellow and senescent approximately before (3-4 d) flower wilting, and these physiological conditions carry a negative impact at postharvest (Chanasut et al 2003, Galati et al 2017, Langroudi et al 2019. In our group, we are studying some treatments to delay leaf senescence and we have faced the necessity to evaluate fast and accurately the greenness and Chl content of the leaves in a nondestructive manner.…”