Abstract
This paper describes the seasonal changes in pectin content and pectinmethyleste rase (PE) and polygalacturonase (PG) activities in two cultivars of kiwifruits, 'Kory oku' and 'Hayward'. The main purpose of the study was to investigate the seasonal change s in pectin content on the basis of PE and PG activities and their properties. PE showed hig hest activity in September in both cultivars and decreased to about half in November. On the other hand, PG showed almost constant activities in both cultivars. Total pectin (TP) content was highest in September for 'Koryoku' and in October for'Hayward', whereas water soluble pectin (WSP) was lowest in October for both cultivars.
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