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    Volume 39
    Issue 1

Intra- and inter-isolate variation in two predominant Plasmopara halstedii (sunflower downy mildew) races in Europe
Pages 1-8

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    ABSTRACT:  Morphological, pathogenic and genetic variation was studied in two Plasmopara halstedii (sunflower downy mildew) races 100 and 710 using five single zoosporangium isolates per pathogen isolate. Aggressiveness criteria were analysed in one sunflower inbred line showing a high level of quantitative resistance. Morphological analyses were carried out on zoosporangia and sporangiophores for single zoosporangium isolates. Genetic relationships were detected among the single zoosporangium isolates using 12 EST (Expressed Sequence Tag)-derived markers. Index of aggressiveness was calculated for each isolate and revealed the presence of significant differences in and between single zoosporangium isolates of two races 100 and 710. There were significant morphological differences for pathogen single zoosporangium isolates. There was no relation between zoosporangia and sporangiophore morphology and race virulence profiles or aggressiveness criteria. There was no intra-isolate genetic variation for the two pathogen races, but major genetic variation was observed between single zoosporangium isolates of the two races 100 and 710. A correlation was detected between pathogenicity traits and EST genotypes.

    KEY WORDS:  Plasmopara halstedii, sunflower downy mildew, EST-derived markers, morphology of zoosporangia and sporangiophores, aggressiveness, virulence, Helianthus annuus

Compositional characteristics of the essential oil of Pimpinella anisum and Foeniculum vulgare grown in Serbia
Pages 9-14

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    ABSTRACT:  The essential oils obtained by hydrodistillation from the mature fruits of Pimpinella anisum and Foeniculum vulgare were analyzed by GC-MS. The oil of aniseed was characterized by higher amounts of trans-anethole (96.80%) than fennel essential oil (83.43%). The isomer of trans-anethole, methyl chavicol (estragol) was also present in both plants, with 1.36% in fennel and 0.19% in aniseed. Apart from these two phenylpropanoids, nine sesquiterpenes and one monoterpene were present in essential oil of Pimpinella anisum, which constituted the other 3.01% of essential oil, but only ?-himachalene was present with more than 1%. In the case of fennel, eight monoterpenes constituted the other 15.21% of essential oil, and limonene and fenchone were present with contributions of 9.34 and 4.58%, respectively.

    KEY WORDS:  aniseed, fennel, trans-anethole, methyl chavicol

UV-B induced changes in pea (Pisum sativum) pigments and antioxidative system: Effects of different UV dose distribution on immature and mature leaves
Pages 15-22

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    ABSTRACT:  Pea plants grown hydroponically under a 16/8 h photoperiod were treated with 16.2 kJ m -2 UV-B per day, provided as a single (1 x 30 min) or split (3 x 10 min) dose, to monitor the effects of dose splitting on protein content, photosynthetic pigments and total phenolics content, peroxidase and catalase activity. Apical immature leaves and youngest mature leaves were compared. UV-B treatment led to significant increases in chlorophyll and carotenoid concentrations in mature but not in immature leaves. A single dose was more effective than a split dose, inducing a greater increase in pigment contents. While immature leaves showed no significant differences in total phenolic contents upon treatment, mature leaves responded to the single dose with a slight decrease and the split dose resulted in an increase in total phenolics. A significant increase in catalase activity was observed in mature leaf samples in UV-B treated plants. Total protein content indicated that splitting the daily dose of UV-B induced less damage than the same total daily UV-B dose provided at once. These findings suggest that not only radiation amount, but time distribution of UV-B can also determine plant responses to high radiation doses.

    KEY WORDS:  pea, UV-B, dose distribution, photosynthetic pigments, antioxidative system

Diversity of the Euglenophyta division in the Zasavica River, Serbia
Pages 23-29

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    ABSTRACT:  The Zasavica River has an extraordinary richness of Euglenophyta algae. In general, those algae are cosmopolitan and very common. They usually inhabit stagnant and slow-flowing waters with high content of organic matter during the summer months. Euglenophyta of the Zasavica River in Serbia were studied at two localities (“Molo” and “Mostic”) from December 2012 to November 2013. A total of 89 taxa were recorded. The genus with the highest diversity was Euglena Ehr.(28), followed by Trachelomonas Ehr. (25), Phacus Duj. (24), Lepocinclis Perty (11) and Strombomonas Defl. (1). The highest number of taxa (27) was recorded at “Molo” during August 2013. Nine Euglenophyta taxa found in this research are new for algal flora of Serbia

    KEY WORDS:  Euglenophyta, Zasavica, Serbia

Oreopteris limbosperma (Bellardi ex All.) J. Holub, rediscovered for the flora of Serbia
Pages 57-68

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    ABSTRACT: During a field study of the forest flora carried out on Javor mountain (vicinity of the village Kladnica between Ivanjica and Sjenica) we collected a few individuals of the rare fern Oreopteris limbosperma (Bellardi ex All.) J. Holub on on the edge of the forest close to the local stream. Its last known record from Serbia supported with herbarium evidence dates back to 1875. This species was supposed to be extinct in the flora of Serbia and this is its first confirmed record after almost 140 years.

    KEY WORDS:  chorology, pteridology, Special Nature Reserve “Paljevine”

New records and rare taxa of the genus Eunotia Ehrenberg (Bacillariophyceae) for the diatom flora of Serbia
Pages 35-43

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    ABSTRACT:  Diatoms inhabiting different types of substrate including stone surfaces, sand, mud, filamentous algae and submerged mosses were studied in the Dojkinci River (Stara planina mountain, Serbia). In total 18 Eunotia taxa have been observed, among which three are recorded for the first time in Serbia (Eunotia circumborealis, E. paludosa and E. boreoalpina) and six are rarely recorded taxa for the Serbian diatom flora (E. diodon , E. exigua , E . praerupta, E . subherkiniensis, E . tetraodon and E. flexuosa). The morphological features, as observed by light microscopy (LM), are described for each taxon, as well as distribution, locality, altitude, substrate and physico-chemical parameters of water samples.

    KEY WORDS:  Eunotia, diatoms, distribution, Dojkinci River, autecology

Lectotypification of Linnaean names in Tussilago (Asteraceae)
Pages 45-48

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    ABSTRACT: The typification of the names Tussilago alpina and T. petasites ( Asteraceae) are discussed. Specimens from the Burser Herbarium (UPS) are designated as lectotypes

    KEY WORDS:  Asteraceae, Homogyne alpina (L.) Cass, Petasites hybridus (L.) G.Gaertn., G.Mey. & Schreb., typification

Euphorbia davidii Subils (Euphorbiaceae), a new alien species in the flora of Serbia
Pages 49-52

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    ABSTRACT:  Euphorbia davidii Subils (Euphorbiaceae), toothed spurge, is a plant native in N-America, introduced in Europe about fifty years ago. There were no published data about the occurrence of this species in Serbia. Populations of this alien weed were noticed in 2007 in two localities in Vojvodina (Serbia) on the arable fields between the villages Aleksa Šantic and Pacir (CR78) and also app. 10-12 km further between villages Pacir and Ðurdin (CR88 according to 10×10 km UTM). The populations of toothed spurge were distributed in several patches, in a total area of app. 3 ha. In 2013 the area of distribution was app. 7 ha, and the abundance of this species also increased. As a new alien species in Serbia Euphorbia davidii should be further monitored, considering its invasive character and potential spreading from the site where it has been recorded.

    KEY WORDS:  Alien, toothed spurge, invader, non-native

Antioxidant activity of Salvia jurisicii Košanin ethanol extracts
Pages 53-58

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    ABSTRACT:  In this study, ethanol extracts (96%, 50%, 30% and 10%) of Salvia jurisicii Košanin whole plant and different parts (leaves and stems) were investigated for in vitro antioxidant 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2?-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid diammonium salt (ABTS) free radical-scavenging activity and total phenolic and flavonoid contents. The largest extract yields were obtained from the 50% and 30% leaf extracts (21.22% and 19.85%, respectively). The 50% and 96% ethanol extracts of whole plants showed the highest activities against DPPH radical (97.1 and 100.6 µg/ml, respectively) whereas leaf extracts were superior in the ABTS test (1.76 and 1.65 mg AAE/g, for 96% and 50%, respectively). Total phenolic and flavonoid contents were ranged in similar orders for the various extracts: 96%>50%>30%>10%. Ethanol extracts of leaves were the richest in phenols and flavonoids, followed by the whole plant and stems. A very strong linear correlation between ABTS activity and phenolic content of extracts was established (r=0.932). The results suggest that the herb Salvia jurisicii , particularly the leaves, could be considered as a potential source of natural antioxidants.

    KEY WORDS:  Salvia jurisicii , Lamiaceae, DPPH, ABTS, phenolics, flavonoids

Oxalis europaea Jordan, O. stricta L. and O.corymbosa D.C. (Oxalidaceae): new records for the flora of Turkey
Pages 59-61

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    ABSTRACT:  In this study, three new species Oxalis europaea Jordan, O. stricta L. and O. corymbosa D.C. (Oxalidaceae) are recorded for the flora of Turkey with the specimens collected from A1(E) Edirne in European Turkey. Short morphological descriptions including photographs of the species are given. In addition, a new key that contains the new Oxalis species added to the flora of Turkey has been constructed.

    KEY WORDS:  Flora, new records, Oxalis, Turkey

Additional bryophyte records from Gümüshane province in Turkey
Pages 63-70

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    ABSTRACT:  A result of bryological excursion in the Gümüshane province in Turkey (North east Anatolia), a total of 189 bryophytes belonging to 92 genera (19 liverworts and 180 mosses). Encalypta trachymitria Ripart was found for the second time from Turkey. Furthermore, 14 taxa were recorded as new records for the Gümüshane A4 grid-square

    KEY WORDS:  Biodiversity, Bryophyte, Gümüshane, Turkey