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Broccoli is a short-term fresh storage vegetable; it most often goes to the processing plant where it is frozen or cold-stored. 1-methylcyclopropene gas (1-MCP) can be used to extend broccoli's shelf life. The aim of the study was to investigate the effect of the genetic cultivar determinants, the use of 1-MCP and the storage time on the weight loss as well as the content of nutrients and harmful compounds in cultivars: 'Bay Meadows', 'Monaco', 'Naxos' and 'Vicario'. The cultivars selected for the study differed significantly in terms of the traits after harvest and storage, and the differences were also conditioned by the interaction of the genetic factor and 1-MCP used, especially within 30 days after harvest. Of the broccoli cultivars, 'Monaco' demonstrated the lowest weight loss during storage, the highest content of dry weight, total sugars, vitamin C, both after harvest and after storage, in the samples treated with 1-methylcycloprepene after harvest. In turn, 'Vicario' lost most weight after storage and broccoli florets treated with 1-MCP have lost less weight. The highest amounts of nitrates and nitrites, both after harvest and after storage, were found in 'Monaco'; however, the differences, as compared with the other cultivars, were significant, yet relatively low. The lowest compactness of the florets was recorded, and hence the lowest commercial value (basically unmarketable), for 'Naxos', 'Monaco' and 'Vicario' cultivars after 30 days of storage without the use of 1-MCP. However, due to the use of 1-MCP and low temperature (4 °C), the commercial value of those broccoli cultivars was satisfactory. [ABSTRACT FROM AUTHOR]