Results 171 to 180 of about 11,347 (217)

The effect of thiouracil on the viability of eggs and embryogeny in Pteridium aquilinum

Planta, 1972
Gametophytes of Pteridium aquilinum fed for six days with 50 and 75 p.p.m. thiouracil ceased to produce archegonia, but archegonia already initiated completed their development. Eggs produced in the presence of 50 p.p.m. thiouracil were viable, but embryogenesis was retarded. Gametophytes fed with 75 p.p.m.
R D, Jayasekera, P R, Bell
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Pteridium aquilinum

2000
Abstract Bracken fern (Pteridium aquilinum) is a plant (family Polydodiaceae) containing thiaminase I; this enzyme causes thiamine and thiamine diphosphate depletion. Ingestion of the fern by livestock causes significant neurotoxicity, which is dependent on plant part, season, maturity of the plant, and rainfall.
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Dihydrocinnamic acids in Pteridium aquilinum

Food Chemistry, 2005
Abstract Dihydro-p-coumaric (phloretic) and dihydroferulic acids have been identified in Pteridium aquilinum. Whereas the latter has been located in cyanogenic and acyanogenic plants, the first has only been detected in cyanogenic forms.
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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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A Study of Apospory in Pteridium aquilinum

American Fern Journal, 1949
thesis on the Ferns of Quebec,7 Brother Marie-Victorin included this fern, remarking that since it occurs in Vermont almost up to the Canadian boundary, it is surely present in Quebec also. Although this was doubted by others, the fern was later discovered near Bedford, in Quebec a few miles north of the Vermont border, as reported by Mousley.8 In ...
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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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Ultrastructural and cytochemical studies on oogenesis of the fern Pteridium aquilinum

Sexual Plant Reproduction, 2012
Egg development in Pteridium aquilinum var. latiusculum was studied using ultrastructural and cytochemical methods to examine structural features influencing fertilization in leptosporangiate ferns. Ultrastructural observations indicate a separation cavity is first formed above the egg during oogenesis with a pore region persistently connecting the egg
Jian-Guo, Cao, Xi-Ling, Dai, Quan-Xi, Wang   +2 more
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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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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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