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The effect of methanesulfonic acid (MSA) on the morphophysiology and biochemistry of the subantarctic species Colobanthus apetalus and the Antarctic species Colobanthus quitensis was examined. We evaluated the effects of various concentrations of MSA on the germination capacity and germination rate of seeds, seedling growth, chlorophyll fluorescence in cotyledons, and the proline content of seedlings...
The paper describes anatomical and physiological features of photobionts and mycobionts in Bryoria forsteri Olech & Bystrek, Caloplaca regalis (Vain.) Zahlbr., Cetraria aculeata (Schreb.) Fr., Ramalina terebrata Hook f. & Taylor, Sphaerophorus globosus (Huds.) Vain. and Usnea antarctica Du Rietz, collected in the Antarctic under varied weather conditions. Green algae from the genera Lobosphaera...
In the last few decades, changes of reproductive pattern of polar vascular plants have been observed, for the benefit of generative propagation. The reasons for this phenomenon are attributed to intensively following climate change, whose effects may be various. Warming causes the production of the greater number of generative structures, with higher quality. Our macroscopic observations conducted...
Polar vascular plants native to the Arctic and the Antarctic geobotanical zone have been growing and reproducing effectively under difficult environmental conditions, colonizing frozen ground areas formerly covered by ice. Our macroscopic observations and microscopic studies conducted by means of a light microscope (LM) and transmission electron microscope (TEM) concerning the anatomical and ultrastructural...
Colobanthus quitensis (Kunth) Bartl, produced two types very small bisexual flowers. In the Antarctic natural conditions chasmogamic and cleistogamic flowers most often form five stamina with short filaments. Two microsporangia with a three-layer wall form in the anther. Microspore mother cells, which develop into microspores after meiosis, form inside the microsporangium. Microsporocytes of Colobanthus...
The objective of the present study was to determine the effects of soil temperature, desiccation, light conditions and concentration of nitrates on the seasonal germination pattern of Cirsium arvense achenes. Seed lots collected in summer were buried in field in autumn. Once a month all over a year, one portion of them was exhumed to test germination in light or darkness, with or without nitrate and...
Colobanthus quitensis wytwarza kwiaty chasmogamiczne i kleistogamicz- ne. Ich budowa wskazuje na możliwość zarówno obcopylności, jak i samopylności. W sprzyjających warunkach (naturalnych lub laboratoryjnych) kwiaty otwierają się i wtedy istnieje możliwość krzyżowego zapylenia. Występowanie kleistogamii u ba- danego gatunku może być uwarunkowane czynnikami abiotycznymi: niską tempe- raturą, wysoką...
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