Changes in endogenous hormone levels during the ripening of grape cultivars having different berry set mechanisms
2005
Baydar, G. N. | Harmankaya, N.
Concentrations of indole-3-acetic acid (IAA), gibberellic acid (GA) and abscisic acid (ABA) were measured by gas chromatography (GC) in the berries of 3 grape cultivars having different berry set mechanisms to elucidate the possible relationship between endogenous hormones and berry set mechanisms. The results obtained showed that the levels of IAA, GA and ABA in seeded Italia, empty seeded Cavus and stenospermocarpic seedless Perlette cahanged during ripening. While Italia exhibited a hormonal pattern similar to that of Cavus, Perlette showed a different IAA and ABA pattern compared to the other cultivars. Generally, IAA and GA were high in the early stages of berry growth. The concentrations of IAA nad GA in the berries declined to very low levels at the time of ripening. The highest content of hormones were found in Italia and the lowest in Perlette. Cavus was placed between them with intermediate concentrations. From the results, it was concluded that there may be a close relationship between hormone contents in berries and the degree of seed development
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