Abstract
The MeJA has been shown to be promising in reducing the damages caused by cold and maintaining the quality in several products. Nevertheless, few studies are conducted with flowers and there are no studies of its use in bird of paradise. The objective of this study was to determine whether the pulsing application with MeJA submitted to cold storage promotes physiological changes of the bird of paradise. Flowers were placed in solutions of 200 g L-1 sucrose added with 100, 250 and 400 μmol L-1 MeJA and control without MeJA, for 24 h. The stems were transferred to containers with water at 5 ºC for 28 days. During storage, the water absorption, transpiration and fresh mass were reduced, while the extravasation of electrolytes and phenolic compounds increased. The application of MeJA did not reduce the loss of fresh mass and extravasation of electrolytes. The application of 400 μmol L-1 MeJA has increased peroxidase activity since day 14 of storage. It is concluded that the application of MeJA with pulsing under refrigeration does not promote positive physiological changes for the maintenance of the quality in bird of paradise flowers.
Highlights
Bird of paradise is highly valued in floral arrangements due to its shape, color and rusticity, as all cut flowers have a reduced commercialization period
The lesions are variable, the discoloration of the petals and the appearance of necrotic spots are common, as observed in heliconia (Costa et al, 2011) and orquídea (Mapeli et al, 2011). The cause of these injuries is the production of oxigenreactive species (ROS) in response to stress, promoting the peroxidation of membrane lipids, which can be measured by electrolyte leakage (EL)
The stems were standardized to 25 cm and placed in pulsing solutions with 200 g L-1 sucrose added with concentrations of 100, 250 and 400 μmol L-1 methyl jasmonate (MeJA) (Methyl Jasmonate, Sigma-Aldrich, 95%), and controlled only with sucrose for 24 h
Summary
Bird of paradise is highly valued in floral arrangements due to its shape, color and rusticity, as all cut flowers have a reduced commercialization period. Conditioning the flowers at low temperatures is an alternative to maintain quality and prolong durability Flowers such as orquídea anthurium, bird of paradise, heliconia, etc., cannot be stored at commercial storage and transportation temperatures (0–4 °C) due to the occurrence of cold injury (Darras, 2019). The lesions are variable, the discoloration of the petals and the appearance of necrotic spots are common, as observed in heliconia (Costa et al, 2011) and orquídea (Mapeli et al, 2011) The cause of these injuries is the production of oxigenreactive species (ROS) in response to stress, promoting the peroxidation of membrane lipids, which can be measured by electrolyte leakage (EL). ROS acts as a signal by activating enzymes in the plant’s oxidative system (Suzuki & Mittler, 2006), such as peroxidase (POD), in order to overcome the damage caused
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