关键词: 月季, 切花, 开花, 衰老, 内肽酶

Abstract: Cut rose(Rosa hybris )‘Samantha’，a cultivar with strong tolerance to water deficit stress，and‘Belami’，a cultivarwith middle range tolerance weI'e used to investigate the cha ses of contents of soluble protein and free amino acid， and endopeptidase activity in petals during flower opening and senescence． The results showed that obvious differences between the two cultivars were obtained in contents of solub le protein and free amino acid，an dendopeptidase activity during flower ope ning and senescence，although the salTle change patterns were obtained ．Soluble protein content was lower in ‘Samantha’tllall in ‘Belami’．Endope ptidase activity Was much higher at pH 10，although it Was lower at pH 6 in‘Samantha’than in ‘Belami’．However，it Was confirmed in petals of the two cultivars that there were two kinds of endopeptidase：mercapto proteinase an d serine acid proteinase．The results above suggested that the diference of endopeptidase activity between two cultivars might be related to their tolerance to water de6c stress．

Key words: Rose, Cut rose, Flower opening, Flower senescence, Endope ptidase