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

Bu araştırmada, içsel hormonlar ile tane tutum şekilleri arasındaki olası ilişkiyi aydınlatmak amacıyla, farklı tane tutum şekillerine sahip üç üzüm çeşidine ait tanelerde, olgunlaşma süresince indol-3-asetik asit (lAA), gibberellik asit (GA3) ve absizik asit (ABA) miktarları gaz kromotografisi kullanılarak ölçülmüştür. Çekirdekli Italia, stenospermakarpik çekirdeksiz Perlette ve boş çekirdekli Çavuş üzüm çeşidinde 1AA, GA3 ve ABA seviyelerinin olgunlaşma süresince değiştiği tespit edilmiştir. Italia, Çavuş üzüm çeşidi ile benzer bir hormonal süreç gösterirken, Perlette diğer çeşitlerle kıyaslandığında 1AA ve ABA bakımından farklı bir hormonal seyir göstermiştir. Genel olarak, IAA ve GA3 tane büyümesinin erken devrelerinde yüksek bulunmuştur. Olgunlaşma döneminde ise tanelerdeki IAA ve GA3 konsantrasyonu çok düşük seviyelere kadar inmiştir. Diğer taraftan, ABA seviyesindeki değişikliklerin olgunlaşma ile yakından ilişkili olduğu belirlenmiştir. Her üç hormon da en fazla Italia; en az da Perlette çeşidine ait tanelerde bulunurken; Çavuş üzüm çeşidi bu iki çeşit arasında yer almıştır. Araştırmada elde edilen bu sonuçlara göre, tanelerde bulunan hormonların seviyesi ile çekirdeğin gelişme derecesi arasında yakın bir ilişkinin bulunabileceği sonucuna varılmıştır.

Olgunlaşma süresince farklı tane tutum şekillerine sahip üzüm çeşitlerinin içsel hormon seviyelerindeki değişimler

Concentrations of indole-3-acetic acid (1AA), 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 Çavuş and stenospermocarpic seedless Perlette changed during ripening. While Italia exhibited a hormonal pattern similar to that of Çavuş, 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. Çavuş 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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