TY  - CONF
AU  - Vidaković, Danijela
AU  - Dimkić, Ivica
AU  - Krizmanić, Jelena
AU  - Janakiev, Tamara
AU  - Gavrilović, Bojan
AU  - Ćirić, Miloš
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6196
AB  - Soda pans are restricted to the Carpathian Basin and differ from other similar saline waters mainly due to the dominant presence of Na+, HCO3–, and CO32– ions. These shallow and temporary aquatic habitats are inhabited by a number of species that can thrive in extreme environments. In Serbia, saline habitats are rare, endangered, and most common in the territory of Vojvodina. One of the most investigated group of organisms in soda pans is diatoms. Due to ecophysiological plasticity, they can survive and tolerate extreme environmental conditions which gives them a competitive advantage over other algae. Quite the opposite, prokaryotes in saline habitats are not sufficiently studied and data are scarce. Thus, samples from 6 soda pans were collected in March 2021 aiming to determine diatom (microscopic and molecular analysis, 18S rRNA gene) and bacterial community (16S rRNA gene).
Most of the recorded diatom taxa are neutrophilic to alkalibiontic, mostly halophilic, and eutrophic species. The species richness diversity index was the highest in Velika Slatina and Slatina, while it was lowest in Mala Rusanda. The genus Nitzschia was one of the most represented and numerous according to morphological analyses (24 taxa, 4 dominant), while molecular analyses indicate 11 different species with low abundances and mainly with unassigned sequences. The biggest discrepancy in these two approaches was observed in Mala Rusanda and Okanj bara. Metabarcoding analysis indicated Halamphora veneta as the dominant taxa, while morphological analyses have shown a predominance of Nitzschia supralitorea and Surirella brebissonii in Mala Rusanda, and N. austriaca in Okanj bara.
Estimated richness and alpha diversity indices showed the highest bacterial diversity in Velika Rusanda and Okanj bara, while the lowest richness was in Mala Rusanda. Representatives of the phylum Proteobacteria were detected predominantly in Pečena Slatina, Bacteroidota in Velika Slatina, Actinobacteria in Okanj bara, while representatives of Firmicutes were most abundant in Slatina, Velika Rusanda, and Mala Rusanda. At the genus level, 515 different genera were detected, and some of the most dominant were: Luteolibacter, unidentified genera from the family Bacillaceae, Actibacter, etc.
Further investigations will be required to overcome the problem of the reference barcoding library incompleteness for halophilic and alkaliphilic species in these habitats and try to reveal the unknown relationship between diatoms and bacteria.
PB  - University of Antwerp
C3  - Book of Abstracts - 14th European Diatom Meeting,  09-11 May 2023, Meise Botanic Garden, Belgium
T1  - Diatom and bacteria assemblages in saline habitats (Vojvodina, Serbia)
SP  - 95
EP  - 95
UR  - https://hdl.handle.net/21.15107/rcub_cer_6196
ER  - 

@conference{
author = "Vidaković, Danijela and Dimkić, Ivica and Krizmanić, Jelena and Janakiev, Tamara and Gavrilović, Bojan and Ćirić, Miloš",
year = "2023",
abstract = "Soda pans are restricted to the Carpathian Basin and differ from other similar saline waters mainly due to the dominant presence of Na+, HCO3–, and CO32– ions. These shallow and temporary aquatic habitats are inhabited by a number of species that can thrive in extreme environments. In Serbia, saline habitats are rare, endangered, and most common in the territory of Vojvodina. One of the most investigated group of organisms in soda pans is diatoms. Due to ecophysiological plasticity, they can survive and tolerate extreme environmental conditions which gives them a competitive advantage over other algae. Quite the opposite, prokaryotes in saline habitats are not sufficiently studied and data are scarce. Thus, samples from 6 soda pans were collected in March 2021 aiming to determine diatom (microscopic and molecular analysis, 18S rRNA gene) and bacterial community (16S rRNA gene).
Most of the recorded diatom taxa are neutrophilic to alkalibiontic, mostly halophilic, and eutrophic species. The species richness diversity index was the highest in Velika Slatina and Slatina, while it was lowest in Mala Rusanda. The genus Nitzschia was one of the most represented and numerous according to morphological analyses (24 taxa, 4 dominant), while molecular analyses indicate 11 different species with low abundances and mainly with unassigned sequences. The biggest discrepancy in these two approaches was observed in Mala Rusanda and Okanj bara. Metabarcoding analysis indicated Halamphora veneta as the dominant taxa, while morphological analyses have shown a predominance of Nitzschia supralitorea and Surirella brebissonii in Mala Rusanda, and N. austriaca in Okanj bara.
Estimated richness and alpha diversity indices showed the highest bacterial diversity in Velika Rusanda and Okanj bara, while the lowest richness was in Mala Rusanda. Representatives of the phylum Proteobacteria were detected predominantly in Pečena Slatina, Bacteroidota in Velika Slatina, Actinobacteria in Okanj bara, while representatives of Firmicutes were most abundant in Slatina, Velika Rusanda, and Mala Rusanda. At the genus level, 515 different genera were detected, and some of the most dominant were: Luteolibacter, unidentified genera from the family Bacillaceae, Actibacter, etc.
Further investigations will be required to overcome the problem of the reference barcoding library incompleteness for halophilic and alkaliphilic species in these habitats and try to reveal the unknown relationship between diatoms and bacteria.",
publisher = "University of Antwerp",
journal = "Book of Abstracts - 14th European Diatom Meeting,  09-11 May 2023, Meise Botanic Garden, Belgium",
title = "Diatom and bacteria assemblages in saline habitats (Vojvodina, Serbia)",
pages = "95-95",
url = "https://hdl.handle.net/21.15107/rcub_cer_6196"
}

Vidaković, D., Dimkić, I., Krizmanić, J., Janakiev, T., Gavrilović, B.,& Ćirić, M.. (2023). Diatom and bacteria assemblages in saline habitats (Vojvodina, Serbia). in Book of Abstracts - 14th European Diatom Meeting,  09-11 May 2023, Meise Botanic Garden, Belgium
University of Antwerp., 95-95.
https://hdl.handle.net/21.15107/rcub_cer_6196

Vidaković D, Dimkić I, Krizmanić J, Janakiev T, Gavrilović B, Ćirić M. Diatom and bacteria assemblages in saline habitats (Vojvodina, Serbia). in Book of Abstracts - 14th European Diatom Meeting,  09-11 May 2023, Meise Botanic Garden, Belgium. 2023;:95-95.
https://hdl.handle.net/21.15107/rcub_cer_6196 .

Vidaković, Danijela, Dimkić, Ivica, Krizmanić, Jelena, Janakiev, Tamara, Gavrilović, Bojan, Ćirić, Miloš, "Diatom and bacteria assemblages in saline habitats (Vojvodina, Serbia)" in Book of Abstracts - 14th European Diatom Meeting,  09-11 May 2023, Meise Botanic Garden, Belgium (2023):95-95,
https://hdl.handle.net/21.15107/rcub_cer_6196 .

TY  - JOUR
AU  - Janakiev, Tamara
AU  - Dimkić, Ivica
AU  - Unković, Nikola
AU  - Ljaljević Grbić, Milica
AU  - Opsenica, Dejan
AU  - Gašić, Uroš
AU  - Stanković, Slaviša
AU  - Berić, Tanja
PY  - 2019
UR  - https://www.frontiersin.org/articles/10.3389/fmicb.2019.02287/abstract
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3093
AB  - European plum (Prunus domestica L.) is a significant commercial crop in Serbia in terms of total fruit production, and it is traditionally processed into slivovitz brandy. The annual plum yields in Serbia is strongly affected by Monilinia laxa, causing brown rot in stone fruits. The fungal communities associated with leaves and fruits of four local Serbian plum cultivars (Požegača, Ranka, Lepotica and Rodna) were investigated in two phenological stages during early (May) and late (July) fruit maturation. Alpha diversity indices showed that fungal communities were heterogeneous and Beta diversity indicated that autochthonous fungal communities depended upon seasonal changes and the cultivars themselves. The phylum Ascomycota was the most abundant in all samples, with relative abundance (RA) between 46% in the Požegača cultivar (May) and 89% in the Lepotica cultivar (July). The most abundant genus for all plum cultivars in May was Aureobasidium, with RA from 19.27 to 33.69%, followed by Cryptococcus, with 4.8 to 48.80%. In July, besides Cryptococcus, different genera (Metschnikowia, Fusarium and Hanseniaspora) were dominant on particular cultivars. Among all cultivable fungi, molecular identification of 11 M. laxa isolates from four plum cultivars was performed simultaneously. Bacterial isolates from the plum phyllosphere were tested for their potential antifungal activity against indigenous M. laxa isolates. The most potent antagonist, P4/16_1 was identified as Pseudomonas synxantha, which reduced mycelial growth of M. laxa from 80 to 87.5%. The production of volatile organic compounds was observed as well. Screening for the antibiotic coding gene was positive for phenazine-1-carboxylic acid, and benzene extraction of P. synxantha-active compounds was done. The crude benzene extract exhibited 57–63% inhibition of mycelial growth. The conducted LC/MS analysis of the crude extract confirmed the presence of phenazine derivatives amongst other compounds. Scanning electron microscopy revealed morpho-physiological changes in the hyphae of M. laxa isolates caused by the cell culture and the P. synxantha P4/16_1 crude benzene extract. This is first report of antagonistic activity of P. synxantha against M. laxa induced by diffusible and volatile antifungal compounds, and it appears to be a promising candidate for use as a biocontrol agent against brown rot-causing fungi.
PB  - Frontiers
T2  - Frontiers in Microbiology
T1  - Phyllosphere fungal communities of plum and antifungal activity of indigenous phenazine-producing Pseudomonas synxantha against Monilinia laxa
VL  - 10
SP  - 2287
DO  - 10.3389/fmicb.2019.02287
ER  - 

@article{
author = "Janakiev, Tamara and Dimkić, Ivica and Unković, Nikola and Ljaljević Grbić, Milica and Opsenica, Dejan and Gašić, Uroš and Stanković, Slaviša and Berić, Tanja",
year = "2019",
abstract = "European plum (Prunus domestica L.) is a significant commercial crop in Serbia in terms of total fruit production, and it is traditionally processed into slivovitz brandy. The annual plum yields in Serbia is strongly affected by Monilinia laxa, causing brown rot in stone fruits. The fungal communities associated with leaves and fruits of four local Serbian plum cultivars (Požegača, Ranka, Lepotica and Rodna) were investigated in two phenological stages during early (May) and late (July) fruit maturation. Alpha diversity indices showed that fungal communities were heterogeneous and Beta diversity indicated that autochthonous fungal communities depended upon seasonal changes and the cultivars themselves. The phylum Ascomycota was the most abundant in all samples, with relative abundance (RA) between 46% in the Požegača cultivar (May) and 89% in the Lepotica cultivar (July). The most abundant genus for all plum cultivars in May was Aureobasidium, with RA from 19.27 to 33.69%, followed by Cryptococcus, with 4.8 to 48.80%. In July, besides Cryptococcus, different genera (Metschnikowia, Fusarium and Hanseniaspora) were dominant on particular cultivars. Among all cultivable fungi, molecular identification of 11 M. laxa isolates from four plum cultivars was performed simultaneously. Bacterial isolates from the plum phyllosphere were tested for their potential antifungal activity against indigenous M. laxa isolates. The most potent antagonist, P4/16_1 was identified as Pseudomonas synxantha, which reduced mycelial growth of M. laxa from 80 to 87.5%. The production of volatile organic compounds was observed as well. Screening for the antibiotic coding gene was positive for phenazine-1-carboxylic acid, and benzene extraction of P. synxantha-active compounds was done. The crude benzene extract exhibited 57–63% inhibition of mycelial growth. The conducted LC/MS analysis of the crude extract confirmed the presence of phenazine derivatives amongst other compounds. Scanning electron microscopy revealed morpho-physiological changes in the hyphae of M. laxa isolates caused by the cell culture and the P. synxantha P4/16_1 crude benzene extract. This is first report of antagonistic activity of P. synxantha against M. laxa induced by diffusible and volatile antifungal compounds, and it appears to be a promising candidate for use as a biocontrol agent against brown rot-causing fungi.",
publisher = "Frontiers",
journal = "Frontiers in Microbiology",
title = "Phyllosphere fungal communities of plum and antifungal activity of indigenous phenazine-producing Pseudomonas synxantha against Monilinia laxa",
volume = "10",
pages = "2287",
doi = "10.3389/fmicb.2019.02287"
}

Janakiev, T., Dimkić, I., Unković, N., Ljaljević Grbić, M., Opsenica, D., Gašić, U., Stanković, S.,& Berić, T.. (2019). Phyllosphere fungal communities of plum and antifungal activity of indigenous phenazine-producing Pseudomonas synxantha against Monilinia laxa. in Frontiers in Microbiology
Frontiers., 10, 2287.
https://doi.org/10.3389/fmicb.2019.02287

Janakiev T, Dimkić I, Unković N, Ljaljević Grbić M, Opsenica D, Gašić U, Stanković S, Berić T. Phyllosphere fungal communities of plum and antifungal activity of indigenous phenazine-producing Pseudomonas synxantha against Monilinia laxa. in Frontiers in Microbiology. 2019;10:2287.
doi:10.3389/fmicb.2019.02287 .

Janakiev, Tamara, Dimkić, Ivica, Unković, Nikola, Ljaljević Grbić, Milica, Opsenica, Dejan, Gašić, Uroš, Stanković, Slaviša, Berić, Tanja, "Phyllosphere fungal communities of plum and antifungal activity of indigenous phenazine-producing Pseudomonas synxantha against Monilinia laxa" in Frontiers in Microbiology, 10 (2019):2287,
https://doi.org/10.3389/fmicb.2019.02287 . .