Difference of Endopeptidase Activity in Petals between Two Cut Rose Cultivars with Diferent Tolerance to W ater Deficit Stress during Flower Opening and Senescence

ACTA HORTICULTURAE SINICA ›› 2003, Vol. 30 ›› Issue (02): 232-235.

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Difference of Endopeptidase Activity in Petals between Two Cut Rose Cultivars with Diferent Tolerance to W ater Deficit Stress during Flower Opening and Senescence

Cong Richen;Zhao Xiting; Liu Xiaohui; Gao Junping

(Department of Ornamental Horticulture and landscape Architecture，China Agricultural University，Beijing 100094，China )

Received:2002-08-10 Revised:2003-02-13 Online:2003-04-25 Published:2003-04-25

Abstract

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

CLC Number:

Cong Richen;Zhao Xiting;Liu Xiaohui;Gao Junping. Difference of Endopeptidase Activity in Petals between Two Cut Rose Cultivars with Diferent Tolerance to W ater Deficit Stress during Flower Opening and Senescence[J]. ACTA HORTICULTURAE SINICA, 2003, 30(02): 232-235.

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Difference of Endopeptidase Activity in Petals between Two Cut Rose Cultivars with Diferent Tolerance to W ater Deficit Stress during Flower Opening and Senescence

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