<Original>Differences in Polyamine Levels between 'Kyoho,' 'Campbell Early' and 'Muscat Bailey A' Grapes with Differing Features of Berry Drop

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A comparative study was conducted of berry dropping and changes in polyamine levels in 'Kyoho,' 'Campbell Early' and 'Muscat Bailey A' grapes. Berry dropping occurred first in 'Muscat Bailey A' grapes, peaking 6 days after full bloom. In 'Kyoho' grapes, dramatic berry dropping began 8 days after full bloom and reached a peak two days later. In these two cultivars, berry dropping had almost ceased by 18 days after full bloom. On the other hand, although berry dropping took place in 'Campbell Early' from 4 days after full bloom, fairly constant dropping occurred for the duration of the experiment. The berry setting rate after cessation of berry dropping was highest in 'Campbell Early,' and lowest in 'Kyoho' grapes. Putrescine (Put) predominated in free, in soluble-conjugated and in insoluble bound fractions within each cultivar. In 'Muscat Bailey A' grapes, changes in free PA levels were not found to be associated with berry dropping, but in 'Kyoho' and 'Campbell Early' berry drop was preceded by a reduction in free Put. The decline in free Put level was more pronounced in 'Kyoho' grapes. In 'Kyoho' grapes, changes in the levels of soluble conjugated and insoluble bound PA were anticorrelated to changes in free PA.
大阪府立大学の論文
2002-03-31