|
KMID : 0903619950360010113
|
|
Journal of the Korean Society for Horticultural Science
1995 Volume.36 No. 1 p.113 ~ p.120
|
|
|
Changes in Ethylene Production , Polyamine Levels and Activities of SAM Decarboxylase , ACC Synthase , and EFE during Flower Senescence of Hibiscus syriacus L . cv Yeonggwang
|
|
|
|
|
Abstract
|
|
|
The role of ethylene and interaction of ethylene and polyamines during the senescence of an ephemeral flower, Hibiscus syriacus L. (cv. Yeonggvang) were investigated by measuring ethylene production, contents of endogenous polyamines, ACC and MACC, and activities of ACC synthase, EFE and SAM decarboxylase. In contrast with carnation flowers which showed an autocatalytic ethylene rise as an initiating factor of senescing process, an increase in ethylene production by the flower of Hibiscus was not detected until in-rolling was apparent, suggesting that certain metabolic events preceding the ethylene production led to the senescence. In addition, it was shown that activities of ACC synthase and EFE were fairly high during preclimacteric stage in which ethylene production was very low, and ethylene increased rapidly after 24 h until the termination of experiment (48 h), despite of reduced EFE, ACC synthase activity and ACC content after 36 h.
A progressive senescence of Hibiscvcs flower was found to be invariably associated with the integrity of membranes but was inversely proportional to ethylene production. Similar patterns in activities of ACC synthase and SAM decarboxylase which were
accelerated after 24 h, peaking at 36 h and then declining thereafter were demonstrated even though ethylene production increased and endogenous putrescine (PUT) and spermidine (SPD) contents among polyamines decreased as flowers aged. Accordingly, endogenous levels of polyamines (SPD and SPM) appear to be regulated by the control of PUT content instead of SAM decarboxylase.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|