Institute of Agriculture

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Skopje

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Differentiation of mixed flower buds in some traditional pear varieties in the region of Skopje
(Centre for Evaluation in Education and Science (CEON/CEES), 2018)
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Miskoska-Milevska, Elizabeta
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Investigation of Aril Characteristics of Some Autochthonous Pomegranate (Punica granatum L) Varieties in Macedonia
(National and University Library of the Republic of Srpska, 2017-12-18)
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Gjamovski, Viktor
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<jats:p>The individual aril characteristics of eight autochthonous pomegranate varieties (Lifanka, Bejnarija, Karamustafa, Ropkavac, Valandovska, LC, Zumnarija and Hicaz) from R. Macedonia were investigated using computer vision software methods. The great differences in the dimension of aril at the varieties were determined. The variety Lifanka is characterized with the greatest length (12.6 mm), width (9.5 mm) and mass (0.5 g) of the aril. Cross section aril area (61.1 mm2) and perimeter (31.6 mm) indicate that the variety ‘Hicaz’ is characterized with the smallest aril. Investigation of the aril shape showed different level of asymmetry depending on the variety. Generally, the variety Hicaz is characterized with the most asymmetrical aril. Based on CIELab system of coloration, great differences in the aril colour were noted among the investigated pomegranate varieties. The variety Hicaz had the darkest coloration (L* 19.3; a* 13.1; b* 5.3). High correlation dependence between coloration and shape and mass was determined.</jats:p>
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Differentiation of mixed flower buds in some traditional pear varieties in the region of Skopje
(University of Kragujevac, Faculty of Agronomy, 2018)
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Miskoska-Milevska, Elizabeta
The results in the present paper are part of the scientific research project “Autochtonous genetic resources of pears in the Republic of Macedonia”. Flower bud differentiation was examined in five traditional pear varieties (‘Carigradsko Avche’, ‘Letna Kajkushka’, ‘Vodenka’, ‘Zimska Kajkushka’ and ‘Zimnica’) in the region of Skopje. In the region of Skopje, the differentiation of mixed flower buds in the traditional pear varieties starts in summer. The primordia of calyx and corolla are formed in the period from the second half of October to early November. In mid-November, stamen primordia are formed, while in late November the primordia of carpels are formed. In winter months, the archesporial tissue develops and microsporogenesis occurs. In the period from January to March, microgametogenesis and pollen grain development take place. The earliest differentiation of flower buds (approximately 7–10 days) and the earliest blooming (about 3-4 days) are tipical of the variety ‘Carigradsko Avche’, compared to the latest varieties ‘Zimska Kajkushka’ and ‘Zimnica’.
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Impact of Harvest Time on the Main Agronomic and Fruit Quality Traits of Three Apricot Cultivars
(Informa UK Limited, 2012-10)
Mratinić, Evica
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Milošević, Tomo
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Fruit characteristics of some traditional pear varieties in the Prespa region
(Centre for Evaluation in Education and Science (CEON/CEES), 2015)
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Miskoska-Milevska, Elizabeta
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Investigation of the possibility for production of some stone fruit rootstocks by rooting cuttings
(Centre for Evaluation in Education and Science (CEON/CEES), 2015)
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Gjamovski, Viktor
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Phenological and Production Characteristics of Some Strawberry Varieties in the Region of Skopje
(National and University Library of the Republic of Srpska, 2012-12-28)
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Interaction of environment conditions and genotypes on expression of genetic background in micro-phenophases of strawberry mixed flower bud
(National Library of Serbia, 2013)
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Kratovalieva, Suzana
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Nikolic, Katerina
<jats:p>The aim of this research is differentiation or micro-phenophases of reproductive organs on two junebearing strawberry (Fragaria x anannassa) varieties senga sengana and pocahontas, depending on climate conditions, rosettes ordering and cultivate manner (orchard mulched on black foil and orchard on bare soil). The beginning of differentiation of flower buds is genetic characteristic depending on climate conditions (insulations, day length, higher midday and night air temperatures from 1.05 till the beginning of differentiation, the sum of rainfalls from the beginning of May until the end of July), order of rosettes and cultivate manner The sum of effective temperatures over 10?C from 1st of May till the beginning of differentiation has no influence on beginning of flower buds differentiation. First morphological changes of the apical meristem were started in the first decade of August that has coincided with the day length of 14 hours and day insulations of 9.3 hours. Micro-phenophases were undergoing almost at the same time in both varieties, only the beginning at pocahontas was 2-3 days earlier. Primary rosettes differ 10-15 days earlier than the secondary rosettes. Plants that grown on black foil had 7-10 days earlier flower bud differentiation compared to those grown on bare soil.</jats:p>
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Application of High Performance Liquid Chromatography to the Analysis of Pesticide Residues in Apple Juice
(Walter de Gruyter GmbH, 2018-03-01)
Velkoska-Markovska, Lenche
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Petanovska-Ilievska, Biljana
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The modern apple production involves the use of large amounts of pesticides that can be found in processed products such as apple juice. Harmful effects of pesticide residues on humans, especially children, are well known, hence the content of pesticide residues in fruit, vegetables and their juices should be controlled. This study presents an application of a new, relatively simple and reliable analytical method for qualitative and quantitative determination of three organophosphorus and one organonitrogen pesticide residues in apple juices. The analysis utilizes reversed-phase high-performance liquid chromatography (RP-HPLC) followed by UV diode array detection. Prior to HPLC analysis, a solid-phase extraction (SPE) was used for analytes concentration and sample clean-up. Specificity, selectivity, linearity, precision, accuracy and limit of quantification (LOQ) were examined to assess the validity of the developed method. The method had satisfactory values of multiple correlation coefficients for calibration curves (R<jats:sup>2</jats:sup> ≥ 0.95 ). The precision was evaluated for the retention times and peak areas, and the estimated values for relative standard deviations (RSD) were 0.05 % - 0.18 % and 0.09 % - 0.62 %, respectively, which indicated an excellent precision of the proposed method. Under the established conditions, the recovery of analytes was 93.80 % - 119.41 %, with relative standard deviations below 0.56 %. This method was successfully applied for determination of some organophosphorus and organonitrogen pesticide residues in apple juices which were taken from Macedonian markets. The achieved values for LOQs were low enough compared to the MRLs of the investigated pesticides in apple according to the Regulation (EC) No 396/2005. Detectable residues of the examined pesticides were not found in the analyzed samples.</jats:p>
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Ultrasound influence on coleoptile length at Poaceae seedlings as valuable criteria in prebreeding and breeding processes
(National Library of Serbia, 2012)
Kratovalieva, Suzana
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Srbinoska, Marija
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Meglic, Vladimir
<jats:p>The study includes research on the effect of ultrasound on the ability of seed germination and coleoptile development of cereal landraces (fam. Poaceae): oat (Avena sativa L.) brodski, rye (Secale cereale L.) rakotinska, Triticale svetinikolsko and soft wheat (Triticum aestivum L.) govrlevska. The experiment with ultrasound was carried out at frequency of 30-40 kHz on the thermostatic ultrasonic bath. Seeds were sonicated at a constant temperature (25?C) for 15 min. Ultrasound effect is reflected in the length of the coleoptyl and mesocotyl, although in a good deal is genetically predetermined. Coleoptile length was the longest in Triticale (3.3-5.5 cm) and approximately the same lengths are evident in rye (3.0-6.1 cm). Concerning the mesocotyl the longest one (5.525 cm ? 0.697) is recorded at rye, even significantly longer than control of oat and Triticale. Longer coleoptile of sonicated seeds indicates faster seedling development, good water supply and rapid development and emergence of first leaves. Correlation coefficient showed very high (0.821) and high R2 (67,472%) dependence among variables both, in length of coleoptiles (as dependent variable) and mesocotyl (as independent) with low standard error (0.225). With the simple use of ultrasound the germination period could be shorten, water supply more efficient, the sowing periods will be shorten and good yields even under conditions of climate change with increased temperatures could be achieved.</jats:p>

Institute of Agriculture

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