Post-harvest changes of ethylene-forming enzyme (EFE) activity, aminocyclopropane-1-carboxylic acid (ACC) and polyamine contents in cortex and pith of pear fruits and its relation to ethylene production.
1995
Wei Jun | Tanabe Kenji
Two cultivars of pear (Pyrus pyrifolia Nak.) were studied in this article, one showing ethylene peak on day 9 after harvesting (Kikusui), and the other on day 18 (Nijisseiki). The rate of ethylene production was closely connected with the activity of ethylene-forming enzyme (EFE), the content of 1-aminocyclopropane-1-carboxylic acid (ACC), and polyamine metabolism. The pith consistently showed greater EFE activity than did the cortex. There was no clear difference in ACC content between the pith and the cortex. Three polyamines putrescine (put), spermidine (spd) and spermine (spe), were found in pear fruits, the former two being the major ones found during the post-harvest period in both cultivars. Prior to the ethylene peaks there were clear differences in the pattern of change in polyamine content between the pith and cortex of the two cultivars. It seems that high putrescine content and low spermidine content were related to low rate of ethylene production. The results presented here show that there are differences in ethylene production not only between cultivars, but also between pith and cortex.
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