Canadian Science Publishing
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Transfer of material through the microspore exine from the loculus into the cytoplasm
Canadian Science Publishing - Tập 81 Số 11 - Trang 1070-1082 - 2003
Our results and those we review indicate that the exine has a great capacity for
modifications that enable nutrients to pass through from the anther loculus to
the microspore cytoplasm. Avenues of passage include strands, some of which are
viscin threads, from the tapetum to microspores in, for example, Betula,
Fuchsia, and Epilobium. Micro channels in Lopezia, Gaura, and Gelsemium extend
through ...
An acetolysis-resistant membrane investing tapetum and sporogenous tissue in the anthers of certain Compositae
Canadian Science Publishing - Tập 47 Số 4 - Trang 541-542 - 1969
After the breakup of the meiotic tetrads, it is usual in the Compositae for the
cells of the previously parietal tapetum to invade the anther loculus and form a
Plasmodium ramifying between the young spores. In species of three tribes,
Helenieae, Heliantheae, and Ambrosieae, an extratapetal membrane is formed at
this time, which totally encloses the tapetum and the spore mass. The
extratapetal mem...
Far-red light stimulates internode elongation, cell division, cell elongation, and gibberellin levels in bean
Canadian Science Publishing - Tập 74 Số 5 - Trang 743-752 - 1996
The contributions of cell division and cell elongation and the potential role of
gibberellins in the far-red light stimulation of bean internode elongation were
investigated. When bean plants, Phaseolus vulgaris cv. Kentucky Wonder, were
grown in white light supplemented with far-red light a significant increase, up
to threefold, in internode elongation was observed. Microscopic examination
reveal...
Biosynthesis of 3-acetyldeoxynivalenol and other metabolites by Fusarium culmorum HLX 1503 in a stirred jar fermentor
Canadian Science Publishing - Tập 64 Số 1 - Trang 1-5 - 1986
The formation of 3-acetyldeoxynivalenol (ADON) and other secondary metabolites
of Fusarium culmorum in a stirred jar fermentor is described in relation to
changes in concentrations of sugars, N, P, and O2, and in pH in the medium as
well as changes in cellular parameters. The addition of sodium [1-13C]acetate to
the fermentation demonstrated that the conditions used resulted in the
biosynthesis of...
The development of the embryo sac of sunflower Helianthus annuus after fertilization
Canadian Science Publishing - Tập 51 Số 5 - Trang 879-890 - 1973
The degeneration of one synergid denotes the initiation of embryo and endosperm
development in the embryo sac of sunflower Helianthus annuus L. The other
synergid, the persistent synergid, is present until the late globular stage of
embryogenesis. The primary endosperm nucleus divides before the zygote nucleus
forming a coenocytic nuclear endosperm. When about eight endosperm nuclei are
present du...
A METHOD OF ISOLATING ACTINOMYCETES FROM SCABBY POTATO TISSUE AND SOIL WITH MINIMAL CONTAMINATION
Canadian Science Publishing - Tập 34 Số 1 - Trang 44-47 - 1956
The isolation of actinomycetes from soil or from scabby potato tubers was
facilitated by a 10-min. treatment of the material from which the isolations
were to be made with phenol in dilution of 1: 140. This eliminated most
bacterial contaminants and reduced fungal contaminants especially those of the
spreading type. Treatment of the material with higher concentrations of phenol
progressively decre...
Early abortion of colonies of leaf rust, Puccinia hordei, in partially resistant barley seedlings
Canadian Science Publishing - Tập 60 Số 5 - Trang 714-723 - 1982
Partial resistance (PR) in barley to leaf rust is assumedly a case of durable
resistance. PR is characterized by a reduced rate of epidemic development in
spite of a susceptible infection type. One of the components of PR, low
infectibility, was studied histologically by means of fluorescence microscopy.
Quantitative analyses of the phases of the infection process beyond appressorium
formation sho...
Aquatic plants of acid lakes in Kejimkujik National Park, Nova Scotia; floristic composition and relation to water chemistry
Canadian Science Publishing - Tập 64 Số 4 - Trang 724-729 - 1986
To document the aquatic flora of acid lakes in Kejimkujik National Park, N.S.,
the presence and abundance of aquatic macrophytes growing in water deeper than
3 dm were recorded in 20 lakes. Of the 45 species found, the most important were
Sphagnum macrophyllum, Eriocaulon septangulare, Utricularia purpurea, Scirpus
subterminalis, Pontederia cordata, Nuphar variegatum, Nymphaea odorata,
Eleocharis ...
THE OCCURRENCE OF FUSARIUM SPECIES IN CANADA: IV. TAXONOMY AND PREVALENCE OF FUSARIUM SPECIES IN THE SOIL OF CEREAL PLOTS
Canadian Science Publishing - Tập 32 Số 5 - Trang 622-629 - 1954
A taxonomic study was made of 12,485 isolates of Fusarium that were obtained
from a total of 1674 soil samples taken from two series of permanent cereal
plots during the years 1936–1942. Isolates of Fusarium averaged approximately
16% of total fungus isolates. A total of 16 species, varieties, and forms of
Fusarium, classified in eight sections of the genus, were isolated. These
species, varieties...
QUANTITATIVE AND QUALITATIVE COMPARISONS OF FUSARIUM POPULATIONS IN CULTIVATED FIELDS AND NONCULTIVATED PARENT SOILS
Canadian Science Publishing - Tập 43 Số 8 - Trang 939-945 - 1965
In soils of the Salinas watershed Fusarium solani and Fusarium tricinctum were
found only in the cultivated soils. Propagules of Fusarium oxysporum were
numerous and varied in the cultivated fields but were relatively scarce and
existed essentially as a single clone in the noncultivated soils. In the
Castroville watershed both F. solani and F. oxysporum were recovered from
noncultivated soils fair...
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