Some ampelographic and biochemical characteristics of local grape accessions from Turkey

Abstract

Some ampelographic and biochemical characteristics of eight local grape accessions grown in Coruh valley in Northeastern Turkey were determined. The standard Turkish grape cultivar Cavus was also included the experiment to make better comparison with local ones. Ampelographic characteristics include bunch size, berry color, berry shape and usage. The biochemical parameters were the phenolic compounds, organic acids, vitamin C and specific sugars. The results showed that there was big diversity among local grape accessions in terms of most of the ampelographic and biochemical characteristics. Bunch size ranged from low to medium. Most of the accessions had round berry shape but elliptical, ellipsoidal and oval shape were also determined. The majority of accessions had purple black berry color. Among phenolic compounds compounds chlorogenic acid, syringic acid and rutin were dominant and varied between 1.394 to 4.858 mg/L; 0.731 to 1.934 mg/ L and 0.986 to 1.068 mg/L, respectively. For all accessions, tartaric acid was the dominant (ranged from 2.636 to 5.376 g/L) and followed by malic acid (ranged from 1.079 to 2.646 g/L). Among the sugars, glucose was found to be the major sugar. Overall the accessions evaluated both ampelographic and biochemical characteristics, it is suggested that the majority of accessions had promising characteristics to include them future breeding activities.