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Microbial and specially Bacterial growth in holding solutions of cut flowers can cause blockage in xylem and later will resulted to impaired water uptake and faster wilting. In this experiment, after harvesting and transporting the cut orchid flowers to the Lab., they were put in the bottles containing distilled water which treated with 0, 1.3, 2.6, 3.9 and 5.2 mg/L aqueous ozone and during 24 hrs each 6 hours, bottles solutions were sampled and cultured in different media and the predominant bacterial type was determined. Result revealed: sequence of the strain of studied bacteria is 88, 87 and 86% sequence similarity to the sequence of the strains Burkholderia cenocepacia and Burkholderia dolosa. Moreover, aqueous ozone at 1.3 and 2.6 mg/L did not significantly decreased bacteria population compared to distilled water, while at 3.9 and 5.2 mg/L, the populations were significantly (P ≤0.01) reduced. [Fundam Appl Agric 2021; 6(4.000): 438-443]

Ethylene is produced as a gaseous growth regulator in all plants and their constructive parts such as roots, stems, leaves, flowers and fruits. It is considered as a multifunctional phytohormone that regulates both growth including flowering, fruit ripening, inhibition of root growth, and senescence such as senescence of leaves and flowers and etc. In addition, exposure to external ethylene is caused some changes that are often undesirable and harmful. Some flowers are more sensitive to others and when exposed to ethylene; their aging process is hastened. 1-MCP is an exogenous and endogenous ethylene action inhibitor, which binds to the ethylene receptors in the plants and prevents the ethylene-dependent reactions. The binding affinity of 1-MCP for the receptors is about 10 times more than ethylene. Hence, 1-MCP can be a potential candidate for controlling of ethylene injury in horticultural crops. This review integrates knowledge of ethylene biosenthesis in the plants and also mode of action of 1-MCP in preventing of ethylene injury. [Fundam Appl Agric 2020; 5(1.000): 10-20]

This study was conducted to investigate the effects of 1-MCP on the sensitivity to ethylene and postharvest quality of selected cut orchid flowers. Cut orchid flowers are considered as the ethylene sensitive but there are apparently variation in sensitivity among species, cultivars and hybrids. Low effective concentration of 1-MCP and its minimum residues have caused that 1-MCP been viewed as an important and safe candidate for replacing STS. Inflorescences of each Dendrobium Darren Glory (DDG), D. Sonia Bom (DSB), Mokara Calypso Jumbo (MCJ) and M. Chiti Gold (MCG) hybrids were purchased from a commercial farm. After harvest and transport to the Postharvest Lab they were divided into two groups and placed in two chambers. They exposed to 0 and 300 nL L-1 1-MCP for 4 hours. The chambers were opened for 1 hour airing. Then inflorescences of each chamber divided to two subgroups and treated with 0 and 1 µL L-1 ethylene gas, balanced with nitrogen. After 24 hours the chambers were opened and the inflorescences were taken out from them. The inflorescences were kept in the laboratory with normal condition. The most weight loss and longest vaselife was recorded in DDG and MCG with 44% and 14 days respectively. Meanwhile, maximum postharvest quality improvement was obtained by 1-MCP pretreatment in very sensitive cut orchid hybrids. [Fundam Appl Agric 2019; 4(2.000): 759-768]