Title: THE INFLUENCE OF AMINOETHOXYVINYLGLYCINE ON FRUITS OF APPLE CULTIVAR ‘FUJI’

Authors: Nenad Magazin, Zoran Keserović, Biserka Milić, Marko Dorić

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Abstract: Aminoethoxyvinylglycine (AVG) is an inhibitor of ethylene synthesis. Ethylene is a plant hormone that regulates fruits maturation. In order to investigate the influence of AVG on the quality of fruits of ‘Fuji’ a three-year trial was set up with the agent VBC 30033 (4.15% a.i. AVG), which is applied at a concentration of 125 g/l a.i. After harvest all fruits were weighed and subjectively estimated regarding the percentage of over colour. Immediately after harvest fruits were stored at 1° C and 90% RH. After 60 and 120 days fruits was removed from the cold store for quality assessments of total soluble solids (TSS), titratable acidity (TA) and firmness. Treating ‘Fuji’ apples with AVG slowed down starch degradation and the development of over colour but did not affect the weight of the fruits. A positive influence on fruits firmness was evident only at the moment of harvest while differences disappeared during storage. Also, AVG affected TSS and TA in fruits at the moment of harvest by increasing both parameters.

Key words: apple, aminoethoxyvinylglicine, harvest time, firmness, fruit weight, fruit colour

Title: FRUIT CHARACTERISTICS OF QUINCE CULTIVARS IN THE REGION OF BELGRADE

Authors: Aleksandar Radović, Dragan Nikolić, Dragan Milatović, Dejan Đurović, Boban Đorđević

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Abstract: This paper presents the results of four-year study (2010-2013) of the fruit physical and chemical characteristics of eight quince cultivars in the region of Belgrade. Control cultivar for comparison was ‘Leskovacka’. All cultivars were characterized by significantly higher fruit weight and dimensions compared to the control cultivar. The shape of the fruit of most cultivars was round, which is the most suitable for processing. Most of the tested cultivars has exceeded the control in terms of fruit quality. Among tested quince cultivars, ‘Triumph’, ‘Morava’ and ‘Asenica’ can be recommended for growing in the region of Belgrade.

Key words: Cydonia oblonga, cultivar, physical characteristics, fruit quality

Title: CHARACTERISTICS OF PEACH HYBRIDS FROM THE CROSSING COMBINATION Flaminia x Summerset

Authors: Dragan Nikolić, Vera Rakonjac, Aleksandar Radović, Ivana Bakić

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Abstract: Characteristics of F1 hybrids obtained from the crossing combination ‘Flaminia’  ‘Summerset’ are shown in this paper. All of the traits of the examined hybrids were compared with a standard cultivar ‘Summerset’. Later ripening time than the standard cultivar was determined at two hybrids (FS1 and FS6). Fruit weight of the examined hybrids varied from 96.41 g (hybrid FS4) to 167.25 g (hybrid FS2), soluble solids content from 13.15% (hybrid FS5) to 18.00% (hybrid FS4) and total acid content from 0.45% (hybrid FS5) to 0.79% (hybrid FS2). Compared to the standard cultivar, only two hybrids had higher fruit attractiveness, while concerning the taste, all of the examined hybrids surpassed the standard cultivar. Hybrid FS2 can be distinguished as the most promising in terms of late ripening time, fruit weight and quality, which is interesting for recognizing new peach cultivars and further breeding work.

Key words: Prunus persica, F1 generation, selection, ripening time, fruit quality

Title: EVALUATION OF MEDIUM-LATE-SEASON APRICOT CULTIVARS IN THE REGION OF BELGRADE

Authors: Dragan Milatović, Dejan Đurović, Gordan Zec

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Abstract: The evaluation of 14 medium-late-season apricot cultivars was carried out in the region of Belgrade over the six-year period (2009-2014). Control cultivar for comparison was ‘Hungarian Best’. Compared to the control, tested cultivars flowered from five days earlier (‘Laycot’) to three days later (‘Novosadska Rodna’ and ‘NS-4’), while their harvest was from three days earlier (‘Forum’, ‘Laycot’ and ‘Vitillo’) to six days later (‘NS-6’). In most cultivars (11) yield per tree was significantly higher compared to the control. Fruit weight was significantly higher in nine varieties, while only ‘Harostar’ had significantly lower fruit weight. According to fruit appearance, cultivars ‘Silvercot’, ‘NS-4', ‘Novosadska Rodna’ and ‘Roxana’ stood out, while according to taste, cultivar ‘Forum’ singled out. Based on the results obtained, several cultivars can be recommended for commercial growing in the Belgrade area: ‘Betinka’, ‘Laycot’, ‘Novosadska Rodna’, ‘NS-4’, ‘NS-6’, ‘Roxana’, ‘Silvercot’ and ‘Vitillo’ (mostly for fresh fruit consumption), as well as ‘Forum' (mostly for fruit processing).

Key words: Prunus armeniaca, time of flowering, time of maturing, yield, fruit quality

Title: PHYSICAL AND CHEMICAL FRUIT PROPERTIES OF APRICOT CULTIVARS AND SELECTIONS FROM NOVI SAD WITHIN HIGH-DENSITY GROWING SYSTEM

Authors: Maja Miodragović, Zoran Keserović, Biserka Milić, Marko Dorić, Nenad Magazin

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Abstract: Physical and chemical traits were studied during the two-year period (2012-2013) in four apricot cultivars (‘NS-4’, ‘NS-6’, ‘Novosadska Rodna’ and ‘Novosadska Kasnocvetna’) and four selections (SK 16a, SK-1, SK 13a i SK-3) that were selected at the Faculty of Agriculture, Novi Sad. The orchard was established in 2008, in the village Maradik on Fruška Gora mountain. The rootstock was Prunus cerasifera Ehrh. and the interstock ‘Stanley’ plum cultivar. Tree spacing was 4 x 2 m. All examined cultivars and selections had very large fruits, except for the ‘NS Kasnocvetna’. The highest fruit weight was achieved in cultivar ‘NS-4’ and selection SK-16a. The largest fruits were found in cultivar ‘NS-4’ and the smallest in cultivar ‘NS Kasnocvetna’. All cultivars had large stone. Stones were the largest in cultivar ‘NS-4 and the smallest in cultivar ‘NS Kasnocvetna’. The highest flesh ratio was recorded with SK-13a and the lowest with ‘NS Kasnocvetna’. The highest soluble solid content was detected in ‘NS-4’, and the highest total acids content in ‘NS Kasnocvetna’. The best performance in a high-density orchard was shown by cultivar ‘NS-4’ and selections SK13a and SK-16a, which stood out for very large fruit, high flesh ratio and high content of soluble solids.

Key words: apricot, cultivar, selection, fruit weight, flesh ratio

Title: DETERMINATION OF S-ALLELIC CONSTITUTION IN SOME SWEET CHERRY CULTIVARS (Prunus avium L.)

Authors: Slađana Marić, Sanja Radičević, Radosav Cerović, Dragana Vranić

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Abstract: The paper presents the results of S-genotyping for sweet cherry cultivars ‘Germersdorfer’, ‘Hedelfinger’ and ‘Junska Rana’ from collections and commercial orchards in the Republic of Serbia and Romania. The use of the polymerase chain reaction (PCR method) with consensus primers for the second intron and allele-specific primers enabled determination of the following S-allelic constitutions in the assessed samples: S3S4 (‘Germersdorfer’ 1), S3S12 (‘Germersdorfer’ 2-8 and ‘Hedelfinger’ 1-2) and S3S5 (‘Hedelfinger’ 3). The results of this investigation confirmed that the methods used for determination of S-genotype are very suitable for reliable and relatively rapid genotyping of sweet cherry cultivars. This is the first report of S-allelic constitution for ‘Junska Rana’ (S3S9), based on which this cultivar has been assigned to incompatibility group XVI.

Key words: Prunus avium, cultivar, S-allelic constitution, genotyping, incompatibility group

Title: DETECTION AND MOLECULAR CHARACTERIZATION OF PLUM POX VIRUS ISOLATES IN APRICOT ORCHARDS IN MUNICIPALITY OF ČAČAK

Authors: Darko Jevremović, Svetlana A. Paunović

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Abstract: The paper provides an analysis of the presence of different Plum pox virus (PPV) strains in apricot samples in the municipality of Čačak. Many years of research have shown that an extremely low percentage of trees with symptoms of Plum pox virus are present in the orchards. Of the 51 analyzed samples, IC-RT-PCR method confirmed the presence of PPV in 36 samples. The recombinant PPV strain is dominantly present in the infected samples that was detected in 69.4% of samples in single infections, i.e. 80.5% including samples with mixed infections, while the PPV-M and PPV-D strains were identified in a lower percentage. Identified proportion of mixed infections in the analyzed samples, PPV-D with PPV-M strains or PPV-D with PPVRec strains, is significant and amounts to 22.2%.

Key words: Prunus armeniaca L., Plum pox virus, IC-RT-PCR