Some extinct plant taxa on the territory of Novi Sad and their vulnerability status in Vojvodina and Serbia

Natural habitats on the territory of Novi Sad are almost fully destroyed today, as well as their characteristic plant taxa. The reason for disappearance of natural habitats is the development of suburban communities, which is an irreversible process. Plant taxa, specific for wet, salty, and sandy ecosystems grew on those habitats twenty years ago and earlier. This paper presents the overview of 9 taxa (Suaeda maritima subsp. maritima, Androsace elongata subsp. elongata, Cirsium boujartii subsp. boujartii, Aster sedifolius subsp. canus, Blackstonia perfoliata subsp. serotina, Plantago maritima subsp. maritima, Salvia nutans, Allium angulosum, and Typha schuttleworthii). These taxa presented integral parts of autochthonous flora of Novi Sad. Since some of these taxa were found in the field 21 years ago and some even 93 years ago, they are extinct from the flora of Novi Sad

Antioksidantni potencijal korova - Ambrosia artemisiifolia, A. Trifida i Iva xanthifolia

The purpose of this study was to analyze antioxidant systems among three invasive ragweed species, Ambrosia artemisiifolia L., A. trifida L. and Iva xanthifolia Nutt. Antioxidant capacity could be a possible marker of adaptation to variable environmental conditions, since change in amount of antioxidants represents one of the first responses to various environmental stimuli. Among investigated ragweeds, I. xanthifolia leaves had more pronounced guaiacol peroxidase activity (87.5 and 62.5%) and reduced glutathione content (2.3 and 28.8%) than A. artemisiifolia and A. trifida, respectively. However, super-oxide dismutase activity was invariable in all investigated plants (234.1-247.5 U g-1 fresh weight). The highest content of total phenolics, tannins, flavonoids and proanthocyanidins were detected in A. trifida leaves (up to 3.7-fold the amount of the others). According to antioxidant activity tests, investigated ragweed species could be presented in a scale: A. trifida gt I. xanthifolia gt A. artemisiifolia. Accumulation of non-enzymatic antioxidants and lower content of reduced glutathione point to different oxidative stress avoidance strategies of A. trifida when compared to A. artemisiifolia and I. xanthifolia within the same environmental conditions.Svrha ove studije bila je analiza antioksidantih sistema tri invazivne vrste: Ambrosia artemisiifolia L., A. trifida L. i Iva xanthifolia Nutt. Antioksidantni kapacitet može biti potencijalni marker adaptacije na promenljive uslove okoline, jer promena u količini antioksidanata predstavlja jedan od prvih odgovora na različite ekološke faktore. Među ispitivanim korovima, listovi I. xanthifolia imali su izraženiju aktivnost gvajakol peroksidaze (87,5 i 62,5%) i sadržaj redukovanog glutationa (2,3 i 28,8%) u odnosu na A. artemisiifolia i A. trifida, respektivno. Međutim, aktivnost superoksid dismutaze bila je nepromenljiva u svim ispitivanim biljkama (234,1-247,5 U g-1 sveže mase). Najveći sadržaj ukupnih fenola, tanina, flavonoida i proantocianidina detektovan je u listovima A. trifida (do 3,7 puta više od ostalih). Prema ispitivanim antioksidantnim aktivnostima, date vrste mogu biti predstavljene skalom: A. trifida gt I. xanthifolia gt A. artemisiifolia. Akumulacija neenzimskih antioksidanata i manji sadržaj redukovanog glutationa ukazuju na različite strategije izbegavanja oksidativnog stresa kod A. trifida u poređenju sa ostalim ispitivanim korovima u istim uslovima životne sredine

Comparative seed morphology of Trifolium L. Species (Fabaceae)

Background and Purpose: Seed morphological characteristics proved to be useful taxonomic features, helpful in identification of large number of species and genera. Seed characters, such as shape, size and seed-coat surface, have low phenotypic plasticity and are less affected by environmental conditions. The purpose of this study was to describe and compare external seed morphological characteristics of 38 Trifolium species, and to evaluate their possible use for taxonomic considerations. Material and Methods: The seedswere gained from genebanks and seed collections and examined using light and scanning electron microscopy (SEM). Obtained data were statistically processed using analysis of variance, Principal Component Analysis and Multiple Correspondence Analysis. Results and Conclusions: The results showed that seeds were laterally compressed and bilobed and showed morphological variations in size, shape, color, seed coat ornamentation and morphology of the radicle lobe. Examined characters did not provide considerable information that could be used to distinguish subgenera or sections of this genus, because seed characteristics did not support the subgeneric classification. A unique seed coat morphology and combination of other seed characteristics permitted easy identification of some of the examined species, like T. subterraneum, T. alexandrinum, T. angulatum and T. vesiculosum

Antioxidant potential of ragweeds: Ambrosia artemisiifolia, A. trifida and Iva xanthifolia

The combination of reproductive success with high stress tolerance (through osmotic adjustment and antioxidants) is essential for invasion success, particularly in stressful environments in the frame of global change.Antioxidant capacity could be a possible marker of adaptation to variable environmental conditions, since change in amount of antioxidants represents one of the first responses to various environmental stimuli. Among investigated ragweeds, I. xanthifolia leaves had more pronounced guaiacol-peroxidase (GPx) activity (2.5- to 9.7-fold) than A. artemisiifolia and A. trifida. A. artemisiifolia and I. xanthifolia leaves have similar reduced glutathione (GSH) content (13.05 μmol g-1 fr. w.), while A. trifida had 1.3-fold lower GSH concentration. However, superoxide-dismutase (SOD) activity was invariable in all investigated plants (234.1-247.5 U g-1 fr. w.). The highest content of total phenolics, tannins, flavonoids and proanthocyanidins were detected in A. trifida leaves (up to 3.7-fold the amount of the others). According to antioxidant activity (O2˙-, ˙OH and DPPH-scavenging tests), investigated ragweed species could be presented in a scale: A. trifida > I. xanthifolia > A. artemisiifolia. Accumulation of non-enzymatic antioxidants and lower content of GSH point to different oxidative stress avoidance strategies of A. trifida when compared to A. artemisiifolia and I. xanthifolia within the same environmental conditions

Varijabilnost bioloških i agronomskih karaktera divljih grahorica (Vicia) flore Vojvodine

In flora of Vojvodina there are 23 vetch species of different origin Morphological variability, micromorphological analyses of seed testa organization of vegetative organs, content of elements (N, Ca) were presented in this work. Results given in this review paper suggest biodiversity of investigated wild wetch species. Taxonomic and genetic variability of species of Vicia genera can be very interesting from different point of view.U flori Vojvodine, na različitim staništima raste 23 vrste divljih grahorica U radu se daju staništa, botaničke i agronomske karakteristike, odnosno diverzitet grahorica, koji može biti od interesa za agronomsku praksu. Analizirani podaci ukazuju na morfološku, anatomsku i hemijsku varijabilnost biljaka i semena grahorica

Divlje deteline na zaslanjenim staništima Vojvodine

On soil habitats used as pastures and hayfields the presence of wild trefoils is significant. Wild trefoils are important fodder crops and they increase the nutritive value of the plant biomass. 10 out of the 22 species of the genus Trifolium, which are found on the soil habitats in Vojvodina, are shown and they characterize the given ecosystems. Their general distribution is shown as well as their floristical element, distribution in Europe, ecological indices, life form, the major morphological characteristics and their distribution on the soil habitats in Vojvodina.Na slatinskim staništima, koja se koriste kao pašnjaci i senokosi, značajno je prisustvo divljih detelina, koje su važne krmne biljke i povećavaju hranljivu vrednost biljne biomase. Od 22 vrste roda Trifolium, koje su konstatovane na slatinama Vojvodine, prikazane su 10 koje karakterišu date ekosisteme. Dato je njihovo opšte rasprostranjenje, florni element rasprostranjenje u Evropi, ekološki indeksi, životna forma, najvažnije morfološke karakteristike i njihovo rasprostranjenje na slatinama u Vojvodini

Rasprostranjenje vrsta roda Lathyrus L. 1753 (Fabales, Fabaceae) u Vojvodini

Most of the Lathyrus species of the Vojvodina Province arc cultivated for fodder. They are protein-containing herbs which easily recover after grazing. Some perennial species survive in grassland communities for ten years or more. Certain species are important melliferous plants. In the Vojvodina Province, they inhabit different habitats like forests and grasslands, dry and wet sites, thus showing a wide distribution range. Besides their floristic and vegetation aspects, their role as green and dry fodder crops should be emphasized.U radu je dato rasprostranjenje vrste roda Lathyrus u Vojvodini, na UTM kartama sa UTM kodovima i konkretnim lokalitetima. Podaci potiču iz literature koja obuhvata vremenski period od oko 140 godina, Herbarijuma Departmana za biologiju i ekologiju (BUNS) i sopstvenih terenskih istraživanja. Daje se njihov florni element, odnosno areal rasprostranjenja tipovi zemljišta i staništa na kojima rastu, njihov privredni značaj i broj hromozoma. S obzirom da su divlji graškovi značajne krmne biljke, mogle bi biti uključene u gajene ili korišćene u selekciji i oplemenjivanju. U flori Vojvodine raste 16 vrsta roda Lathyrus od kojih 11 njih ima privredni značaj a još dve bi mogle biti koršićene kao krma. U toku je njihovo anatomsko ispitivanje, što će ukazati na nivo ekološke adaptacije i upotrebljivosti u ishrani stoke. Takođe je u toku fiziološka analiza vrsta, analiza makroelemenata, koncentracija pigmenata i intenzitet disanja i fotosinteze od čega zavisi produkcija organske biljne mase

GENUS ALLIUM L. 1753 (AMARAYLLIDALES, ALLIACEAE) ON FLOODED HABITATS IN SOUTHERN PART OF THE PANNONIAN PLANE (VOJVODINA, SERBIA)

Abstract In humid habitats in Vojvodina, only two species of Allium genus has been recorded -A. angulosum and A. vineale. Their distribution is consequence of their ecological adaptability and their origin. A. angulosum belongs to the primitive Rhizirideum section, and by that could be defined as an inhabitant of humid grasslands and ecosystems connected to the dictation of the higric factor. A. vineale is more developed representative of the Allium genus, and it is not limited to the humid habitats, but in Vojvodina it could be found on similar places, because of its wide ecological valence. Both species grow in vegetation of humid grasslands of classis Molinio-Arrhenatheretea Tx. 1937, as well as in classis of weed vegetation angulosum is frequent inhabitant of lowland flooded forest vegetation of order Populetalia albae Br.-Bl. 1931, classis Querco-Fagetea Br.-Bl. et Vlieg. 193