Results 161 to 170 of about 4,283 (200)

Homoeologous Heterozygosity and Recombination in the Fern Pteridium aquilinum

Science, 1979
The bracken fern, Pteridium aquilinum , which can form completely homozygous zygotes in a single generation of self-fertilization, has a genetic system that allows the storage and release of genetic variability in spite of this homozygosity.
R H, Chapman, E J, Klekowski, R K, Selander   +2 more
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Effect of Cryptomycina pteridis on Pteridium aquilinum

Mycologia, 1996
Pteridium aquilinum, noninfected and nat- urally infected with Cryptomycina pteridis, was studied in western South Dakota from 1990-1992. Time of frond emergence in 1990 and 1991 was not signifi- cantly different between fronds in noninfected plots and fronds in infected plots.
Audrey Gabel, Rebecca Studt, Steve Metz
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The occurrence of a multilayered structure in the motile spermatozoids of Pteridium aquilinum

Journal of Ultrastructure Research, 1971
The multilayered structure, originally described from the differentiating spermatozoids of bryophytes, but not known with certainty to be present in the motile gametes, is shown to be present in the spermatozoids of the fern Pteridium fixed while penetrating the archegonium (female gametangium).
P R, Bell, J G, Duckett, D, Myles
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Preparation and antioxidant activity of Pteridium aquilinum-derived oligosaccharide

International Journal of Biological Macromolecules, 2013
In this study, Pteridium aquilinum-derived oligosaccharides (PAO) were prepared from Pteridium aquilinum polysaccharides by hydrolysis using hydrogen peroxide and their hydroxyl radical scavenging activity was investigated. The hydrolysis process was monitored by the yield of PAO.
Hongbing, Wang, Shengjun, Wu
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Occurrence of Endotrophic Mycorrhiza in the Roots of Pteridium aquilinum Kuhn

Nature, 1949
ALTHOUGH Stahl1 believed that Pteridium aquilinum was one of the completely autotrophic ferns, later workers2–5 have reported the presence of an endotrophic mycorrhiza, and Truszkowska5 described an endotrophic mycorrhiza in the roots of Pteridium aquilinum in Poland which he found growing in soil of pH 4·4.
E, CONWAY, M, ARBUTHNOTT
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Phylloplane mycoflora of bracken, Pteridium aquilinum

Transactions of the British Mycological Society, 1974
The phylloplane mycoflora on the fronds of bracken, Pteridium aquilinum , was followed during two seasons and was shown to be similar to that on angiosperm leaves. The succession involved Aureobasidium pullulans, Botrytis cinerea and Clado-sporium herbarum followed by Alternaria alternata and Epicoccum purpurascens .
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Flavonol glycosides from Pteridium aquilinum

Phytochemistry, 1995
Abstract Two new flavonol glycosides from aerial parts of Pteridium aquilinum were identified as quercetin 3- O - β -laminaribioside and isorhamnetin 3- o - β -laminaribioside by chemical and spectroscopic methods.
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Aquilinan, an acidic polysaccharide from Pteridium aquilinum

Phytochemistry, 1976
Abstract A water-soluble, acidic polysaccharide, aquilinan, was isolated from storage rhizomes and young fronds of bracken and shown to be homogeneous. The polysaccharide contained galactose, xylose, fucose and arabinose residues together with chains of repeating α(1-2′)glucuronosylmannose units.
Michael C. Jarvis, Henry J. Duncan
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The cytoplasmic vesicles of the female reproductive cells of Pteridium aquilinum

Zeitschrift f�r Zellforschung und Mikroskopische Anatomie, 1969
Cytoplasmic vesicles appear in conspicuous numbers during oogenesis in the fern Pteridium aquilinum. Two classes of vesicles are recognized: Golgi vesicles, of the order of 0.1 μ in diameter, and larger vesicles, of the order of 0.75 μ in diameter, apparently not derived from the Golgi apparatus.
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Adaptation of Pteridium aquilinum (L.) Kuhn in Siberia

Contemporary Problems of Ecology, 2010
The study has revealed some specific ecological and biological characteristics of bracken that facilitate not only its adaptation to temperate climate, but also dominance in the herbaceous cover, and advancement into new areas within its range. It has been shown that the ecological optimum of bracken is oceanic climate and in Siberia the fern occurs at
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