In this study, effects of two stress inhibitors (particle film-PF and dicarboxylic acid-DA) on aroma composition of Beauty Seedless and Tekirdag Seedless grape cultivars were investigated. Analysis of the aroma components was carried out using solid-phase microextraction technique with gas chromatography (GC) and mass spectrometry (MS). A total of 36 and 24 aroma compounds were identified in Beauty Seedless and Tekirdag Seedless, respectively. The C 6-compounds (hexanal and 2-hexenal) were determined as the most abundant compounds in both grape cultivars and they accounted for 40.1% and 72.3% of total aroma composition in Beauty Seedless and Tekirdag Seedless, respectively. Monoterpenes (geraniol, nerol and neric acid) and sesquiterpenes (α-ylangene and germacrene) had a significant contribution of 35% to the total flavor of Beauty Seedless. Benzophenone, maltol, 6-methyl-5-hepten-2-one, 2-ethyl hexanol, 2-pentyl furan, acetic acid, hexanoic acid were other compounds detected at the highest amount. In Tekirdag Seedless, benzene acetaldehyde, 2-ethyl hexanol, maltol, 4-hexen-1-ol, acetic acid and hexanoic acid were determined as proportionally important compounds. When taken into consideration the use of stress inhibitors becoming an interesting area in viticulture, the effects of treatments in the aromatic composition is limited. In the presented study, proportional levels of any aroma compounds could not be attributed to influence of the stress inhibitors. However, findings presented useful contribution for future studies. On the other hand, this study is the first report on aroma composition of Beauty Seedless and Tekirdag Seedless grape cultivars.

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ÖZET: Fitokimyasallar, bitkilerde doğal olarak bulunan ve biyolojik olarak aktif olan kimyasal bileşiklerdir. Bitkilerde doğal bir savunma sistemi olarak görev yapmalarının yanı sıra renk, aroma ve tattan da sorumludurlar. Bugüne kadar 8000'den fazla fitokimyasal tanımlanmış ve fonksiyonları ve kaynaklarına göre farklı şekillerde sınıflandırılmıştır. En yaygın sınıflandırma; flavanoidler, fito-östrojenler, fitosteroller ve karotenoidler şeklinde olup, bunların da alt grupları bulunmaktadır. Fitokimyasallar, son yıllarda sağlık üzerindeki olumlu etkileri ve özellikle bazı kanser türleri ve kalp hastalıklarına karşı koruyucu olmalarıyla dikkat çekmektedir. Bu bileşiklerin sağlık açısından en önemli etkisi, vücutta serbest oksijen molekülleri ve serbest radikallerle reaksiyona giren antioksidanlar gibi işlev görmeleridir. Bu derleme çalışmasında, sofralık, kurutmalık, şaraplık ve şıralık olarak geniş bir yelpazede tüketilen üzümlerin fitokimyasal içerik yönünden incelenmesi amaçlanmıştır.

In this study, the effects of foliar kaolin particle film treatment (PF) on some table grape quality characteristics of cv. Trakya Ilkeren grown in Ankara conditions were investigated. The application of kaolin particle film (3%) was started just after fruit set. Treatments were repeated weekly for three weeks. Yield per vine was found to be 3.60 kg in Control (C) and 3.93 kg in PF treatment. No significant effect of PF treatment on grape yield was determined. TSS and maturity index were affected positively by PF treatment. TSS was determined as 19.45 o Bx and 20.68 o Bx in C and PF treatment respectively. The maturity index (%) increased from 30.30 (C) to 35.28 (PF) due to the increase in TSS. No differences in pH and titratable acidity were observed between PF and C. While cluster weight increased from 314.48 g (C) to 357.47 g (PF), cluster length increased from 17.14 cm (C) to 19.02 cm (PF). No significant change in cluster width, berry weight, width, length and berry firmness were determined. More intense skin color was obtained from PF treatment according to CIRG index. Considering the findings, it was concluded that PF treatment led to the development in quality attributes of cv. Trakya Ilkeren grown under high solar radiation and temperature stress.