Abstract
A constant low auxin level was observed in a normally setting trimmed cluster of the tetraploid grape ‘Kyoho’ ( Vitis vinifera L. × Vitis labrusca L.). The basipetal auxin transport in the trimmed cluster was always 2–3 times higher than the acropetal transport during the flowering-period. In a non-treated cluster, showing a tendency towards excessive berry abscission, the auxin level in the apical parts of the cluster fluctuated within the range of 20–70 times that of the auxin content at full bloom. The ratio of basipetal to acropetal auxin transport was nearly unity or less than unity. The results support the hypothesis of apical dominance and auxin gradient in the formation of an abscission zone.
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