关键词: 月季 (Rosa hybrida), 衰老, 乙烯, 1-MCP, 内肽酶

Abstract: Cut rose (Rosa hybrida) cv. Samantha and Kardinal were used to investigate the effects of ethylene and its action inhibitor, 1-MCP, on flower opening and senescence, and the activity and types of endopeptidase in petals. The results showed that both cultivars were all sensitive to exogenous ethylene. However, remarkable different tendency of flower morphological changes was observed during and after treatment. Ethylene treatment accelerated the processes of flower opening and senescence, and caused petal abscission in Samantha, while it inhibited flower opening severely, and resulted in bull flower and even wilting directly in Kardinal. Much more dramatic changes were obtained in the petals of Kardinal than in Samantha, although the same tendency was shown in both cultivars regarding that ethylene treatment caused the decline of total soluble protein content and an increase of endopeptidase activity, and 1-MCP treatment had the absolutely opposite effect with ethylene. In addition, more quick and dramatic changes of serine-proteases proportion caused by ethylene, were observed in petals of Kardinal than in Samantha. The results above suggest that the different responses of flower opening and senescence to exogenous ethylene might be related to the changes of endopeptidase activity in petals caused by ethylene treatment in the two cultivars.

Key words: Rose(Rosa hybrida), Senescence, Ethylene, 1-MCP (1-methylcyclopropene), Endopeptidase