Contents of Antioxidant Compounds in Turkish Oats: Simple Phenolics and Avenanthramide Concentrations     

Tevrican Dokuyucu  David M. Peterson  Aydin Akkaya 《Cereal Chemistry》2003,80(5):542-543

Antioxidant products such as simple phenolic compounds and avenanthramides in oat (Avena sativa L.) may have health‐promoting effects on humans. Therefore, it is very important to determine simple phenolics and avenanthramide concentrations of different genotypes of oats from different regions of the world. The aim of this research was to determine the concentrations of simple phenolics and avenanthramides of Turkish oat genotypes. According to the results, Turkish oat genotypes were significantly different for three major avenanthramides (Bc, Bp, and Bf) and the simple phenolic, ferulic acid (FA), while not significantly different for p‐coumaric acid (PCA). Ferulic acid concentrations of Turkish oat genotypes were higher than a standard U.S. cultivar, Belle. However, the major avenanthramide concentrations of Turkish oat genotypes were significantly lower than Belle.  相似文献   

Harmonization ratio of post- to pre-anthesis durations by thermal times for durum wheat cultivars in a Mediterranean environment     

Ayd&#x;n Akkaya  Tevrican Dokuyucu  Rukiye Kara  Mevlut Akura 《European Journal of Agronomy》2006,24(4):404-408

The aims of this article were to calculate harmonization ratios (HR) of post- to pre-anthesis durations for 16 durum wheat cultivars by thermal times, to determine durum wheat cultivars having balanced vegetative period (VP) and grain filling period (GFP) for higher GY capacity and its possibility to be used as an adaptation and selection criteria for cultivars and to investigate relationships between HR and grain yield, phenological periods by the thermal times in a Mediterranean environment.

Experiments were carried out in randomized complete block design with four replications, for three successive years between 2000 and 2003 years, under the conditions of Kahramanmaras province, located in East-Mediterranean region of Turkey. In the research, phenological periods such as VP, GFP, days to maturity (DM) by the thermal times, GY were measured. HR values over thermal times were also calculated by the formula HR_tt = GFP_tt/VP_tt..

According to the results, cultivars were significantly different for VP_tt, GFP_tt, DM_tt by the thermal times and GY. Cultivars were also significantly different for HR. Harmonization ratio was determined as 0.512 for Fuatbey-2000 cv. which supplied the highest GY. On the other hand, the lowest HR_tt was obtained from Altar-84 STN cv. with 0.458 and its GY was also the lowest. Harmonization ratio was significantly and positively correlated with GY over the average results of 3 years. Significant correlations determined between GY and HR_tt showed that this HR_tt value might be considered as useful character on determination of wheat cultivars having balanced VP_tt and GFP_tt for higher GY. Thus, the varieties with the lowest HR_tt may be excluded from the nurseries, in the early generations of breeding works.  相似文献