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Changes in endogenous hormone levels during the ripening of grape cultivars having different berry set mechanisms

Concentrations of indole-3-acetic acid (IAA), gibberellic acid (GA3) 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. | Turk J Agric For 29 (2005) 205-210 © TÜB‹TAK Changes in Endogenous Hormone Levels during the Ripening of Grape Cultivars Having Different Berry Set Mechanisms Nilgün GÖKTÜRK BAYDAR*, Nihat HARMANKAYA Süleyman Demirel University, Faculty of Agriculture, Department of Horticulture, 32260, Isparta - TURKEY Received: 14.05.2004 Abstract: Concentrations of indole-3-acetic acid (IAA), gibberellic acid (GA3) 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, GA3 and ABA in seeded Italia, empty seeded Çavufl and stenospermocarpic seedless Perlette changed during ripening. While Italia exhibited a hormonal pattern similar to that of Çavufl, Perlette showed a different IAA and ABA pattern compared to the other cultivars. Generally, IAA and GA3 were high in the early stages of berry growth. The concentrations of IAA and GA3 in the berries declined to very low levels at the time of ripening. On the other hand, changes in ABA levels were closely associated with ripening. The highest contents of hormones were found in Italia and the lowest in Perlette. Çavufl 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. Key Words: grape, berry set, indole-3-acetic acid, gibberellic acid, abscisic acid Olgunlaflma Süresince Farkl› Tane Tutum fiekillerine Sahip Üzüm Çeflitlerinin ‹çsel Hormon Seviyelerindeki De¤iflimler Özet: Bu araflt›rmada, içsel hormonlar ile tane tutum flekilleri aras›ndaki olas› iliflkiyi ayd›nlatmak amac›yla, farkl› tane tutum flekillerine sahip üç üzüm çeflidine ait tanelerde, olgunlaflma süresince indol-3-asetik asit (IAA), gibberellik asit (GA3) ve absizik asit (ABA) miktarlar› gaz .