New Zealand Journal of Crop and Horticultural Science abstracts
Some fruit attributes of quince (Cydonia oblonga) based on genotypes
during the pre-harvest period
Nurdan Tuna Gunes
Hatice Dumanoglu
Department of Horticulture
Faculty of Agriculture
Ankara University
06110 Ankara, Turkey
email: tuna@agri.ankara.edu.tr
Abstract In this study, changes in respiration rate
(RR), flesh firmness (FF), soluble solid content (SSC), titratable acidity
(TA), fruit colour (FC), and the optimum harvest dates of fruits were investigated
in six different quince (Cydonia oblonga) genotypes over 3 years (1996,
1997, 1998). Also, accumulated heat unit (degree-days) (AHU) above 10¼C
daily mean and number of days after full bloom (DAFB) to the optimum harvest
date of each genotype were also calculated. Although these parameters varied
based on genotype and years, generally RR changed between 1.80 and 6.83 ml
CO2 kg-1 h-1, FF between 56.8 and 91.4 N, SSC between
13.0% and 15.9%, TA between 0.78 and 1.61 g/100 ml, FC values between 96.2
and 110.6°, DAFB between 124 and 162 days, and AHU between 1340 and 1757
degree-days. Generally the ripening period of quince fruits for all genotypes
was between 11 September and 2 October. Otherwise the fruits of ‘Yerkoy’
and ‘Ekmek’ genotypes ripened 7-10 days earlier than the others.
Keywords colour; Cydonia oblonga; firmness; quince;
respiration; soluble solids content; titratable acidity
H04049; Online publication date 5 July 2005 Received 21 May 2004; accepted
13 December 2005
New Zealand Journal of Crop and Horticultural Science, 2005, Vol. 33:
211-217
0014-0671/05/3303-0211 © The Royal Society of New Zealand 2005
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