In the urban area of Banja Luka, 77 species of alien plants have been found, most of them neophytes (64.94%) while a smaller percentage are archeophytes (35.06%). Most of the plants originate from America (34), and Asiatic species rank second (17). Most of the alien plants belong to the Compositae family, in terms of life form are therophytes, and intention has been involved in their arrival in this area.The anthropogenic change indicator values have been shown to have a significant anthropogenic impact on the overall flora.
Background: Drought is one of the major abiotic factors leading to diminishing growth, development and productivity of plants worldwide. Considering that germination is the first phase of growth which in large measure determines plant quality and yield, knowing the effects of different factors on this process is of major importance. This paper studies the effect of drought-induced stress on seed germination and seedling growth of Zea mays L. (the Sweet corn and the hybrid Pioneer B23). Methods: The effect of water stress was caused by different concentrations of mannitol: 5%, 10% and 20%. In the control, we used distilled water. The germination test was performed in three trials of 45 seeds each. The germination percentage, germination potential, drought resistance index were calculated at 3, 5 and 7 days. Growth of seedlings and biomass content were calculate at 14 days.Result: The results show significant differences between the variety and hybrid examined. The pioneer B23 seed germinated in larger number and more quickly. The Sweet corn variety seedling growth was completely absent after treatment with mannitol. The observed difference is certainly not just a consequence of higher mannitol concentrations, but also a difference in the water-retention capability of the variety and hybrid studied.
In order to determine the extent to which reduced light intensity affects some morpho-anatomical characteristics and physiological parameters in young plants of Pisumsativum L. we compared certain plant parameters grown at full illumination (3200 lux) with plants grown at lower intensity illumination (1700, 1000 and 650 lux) in this research.The ultimate goal is a better understanding of the adaptations of the studied species (variety) to different light treatments. Low light intensity had a negative effect on the anatomical structure of the pea leaves and led to the development of thinner leaves compared to the plants grown at full illumination.The results obtained indicate that the thickness of the epidermis of the face and the back, the leaf thickness, the thickness of palisade tissue and the diameter of the conducting bundles decreased with decreasing illumination, while the thickness of the sponge tissue increased with decreasing illumination. The number of stomata both on the face and on the back of the leaves was lower at lower illumination, with the stomata cells being larger in size. The intensity of transpiration decreased with decreasing illumination, which was correlated with the decrease in the number of stomatal cells. The results show that lower light treatment had an inhibitory effect on the photosynthetic pigment content, which indicates the sensitivity of the studied species and raises the question of the level of adaptation and possible diminished yield of the species studied, if grown under poor light conditions.
This paper examines the modus in which earthworm Lumbricus rubellus with its activity affects the total count of different physiological groups of microorganisms in soil treated with herbicide pendimethalin.The experiment was carried out in ten glass containers with a soil substrate, whereby one of them was the control one, and each group of three containers was treated with different concentration of pendimethalin. A concentration of pesticide of 5 μl/kg, which is recommended by the declaration, one lower concentration of 3 μl/kg and one higher of 7 μl/kg were used. The number of physiological groups of microorganisms is determined from the three containers treated with different concentrations of pendimethalin 48 hours after the treatment, and from the other three containers 21 days after the treatment. Two days after the application of different concentration of pesticide, a significant statistical decrease was found in the number of fungi and cellulotical microorganisms in soil, while the total number of heterotrophic bacteria as well as microorganisms which participate in different stages of nitrogen metabolism increased. However, 21 days after the treatment a significant decrease in the total number of heterotrophic bacteria in all treated containers comparing to the control one was noticed, where earthworms with their activities partially attenuated the negative effect of pendimethalin on soil bacterial flora. They also had a positive effect on the number of fungi, actinomycetes and cellulolytic microorganisms while the presence of earthworms had no significant influence on the number of aminoautotrophs, oligonitrophils and free-living diazotrophs. It was shown that earthworms with their activities attenuate the negative effect of pendimethalin on bacterial flora, actinomycetes and fungi, which points out to their possible use in processes of bioremediation.
Field researches of Crna rijeka gorge (Vrbas left tributary, Republic of Srpska) was carried out in vegetation season 2013. A total number of 134 taxa were found in investigated area. The most nummerous in plant species and subspecies were families: Compositae (17.2%), followed by Labiatae and Leguminosae (7.5%). In the biological spectrum of the flora of Crna rijeka gorge, the most frequent were the following life forms: hemicriptophytes (47%), phanerophytes (12.7%) and therophytes / chamaephytes (11.2%). Phytogeographical analysis showd that Sub-Mediterranean (14.6%), Eurasian (13%), Sub-Central European (12,2%) and Sub-Eurasian (11,4%) were the most nummerous floral elements. Adventive plants were represented with 8 taxa. In investigated area 6 plant endemic taxa were noticed: Acer hyrcanum subsp. intermedium, Erysimum linariifolium, Moehringia bavarica subsp. bavarica, Onosma stelullata, Pseudofumaria alba subsp. leiosperma and Symphyandra hofmannii. Key words: Crna rijeka, flora, endemics СажетакТеренска истраживања клисуре Црне ријеке (лијева притока Врбаса, Република Српска) спроведена су током вегетацијске сезоне 2013. године. Укупно је констатовано присуство 134 врсте и подврсте васкуларних биљака. Међу најзаступљенијим фамилијама посебно се истичу Compositae (17,2%), Labiatae и Leguminosae (7,5%). У биолошком спектру флоре клисуре Црне ријеке утврђена је процентуална доминација хемикриптофита (47%), фанерофита (12,7%) и терофита / хамефита (11,2%). Биљногеографска анализа потврдила је доминацију субмедитеранског (14,6%), евроазијског (13%), субсредњеевропског (12,2%) и субевроазијског (11,4%) флорног елемента. Констатовано је присуство осам таксона који припадају адвентивним биљакама. На подручју истраживања потврђено је присуство шест ендемичних таксона: Acer hyrcanum subsp. intermedium, Erysimum linariifolium, Moehringia bavarica subsp. bavarica, Onosma stelullata , Pseudofumaria alba subsp. leiosperma и Symphyandra hofmannii. Кључне ријечи: Црна ријека, флора, ендеми УВОДСлив ријеке Врбас одликује изузетна геоморфолошка, хидролошка, биолошка, односно еколошка разноврсност. Иако цијели ток обилује природним вриједностима,
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.