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‘Akça’ pear is one of the most grown early varieties in Turkey. Although it is of high quality, it forms smaller fruits than other early varieties. In order to investigate the role of aminoethoxyvinylglycine (AVG) application in the harvest time, fruit yield and quality of ‘Akça’ pears, this study was carried out for 2 years in 2012 and 2013 in an orchard located in Isparta-Egirdir (Turkey) Fruit Research Institute. ReTain plant growth regulator was used for AVG. ReTain containing 15% AVG was applied to the ‘Akça’ pear fruits and leaves. Four concentrations of AVG (0, 100, 125, 150 ppm) and three application times [30, 21, 7 days before commercial harvest (DBH)] were evaluated using the field system. Harvest time, fruit yield, fruit size, fruit weight, fruit flesh firmness, titratable acidity (TA), soluble solid contents (SSC), fruit color, ethylene production and respiration rate, and nutritional status of fruits were determined at the harvest time. In addition, the effect of AVG applications on some leaf properties (macro-micro element content, leaf area and chlorophyll) was determined. As a result, 30 and 21 DBH AVG applications delayed the harvest time for 3 days. AVG applications reduced both ethylene production and respiration rate. All AVG applications dramatically increased fruit size (2-16%) and fruit weight (7-57%) as well as fruit flesh firmness (1-55%) of the ‘Akça’ pear. Given all these results, it is considered that 21 DBH AVG applications at 100 ppm will be suitable for the ‘Akça’ pear in terms of harvest time and fruit and leaf quality parameters.

applied ecology and environmental research

THE IMPORTANT ROLE OF AMINOETHOXYVINYLGLYCINE (AVG) PRE-HARVEST APPLICATION IN FRUIT HARVEST TIME, FRUIT QUALITY AND MINERAL ELEMENT CONTENTS OF ‘AKÇA’ (PYRUS COMMUNIS L.)