Canadian Science Publishing
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Transfer of material through the microspore exine from the loculus into the cytoplasmOur 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 ... ...
Canadian Science Publishing - Tập 81 Số 11 - Trang 1070-1082 - 2003
An acetolysis-resistant membrane investing tapetum and sporogenous tissue in the anthers of certain Compositae 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 extrata... ...
Canadian Science Publishing - Tập 47 Số 4 - Trang 541-542 - 1969
Far-red light stimulates internode elongation, cell division, cell elongation, and gibberellin levels in bean 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 examinati... ...
Canadian Science Publishing - Tập 74 Số 5 - Trang 743-752 - 1996
Biosynthesis of 3-acetyldeoxynivalenol and other metabolites by Fusarium culmorum HLX 1503 in a stirred jar fermentor 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 [1-13 C]acetate to the fermentation demonstrated that ... ...
Canadian Science Publishing - Tập 64 Số 1 - Trang 1-5 - 1986
The development of the embryo sac of sunflower Helianthus annuus after fertilization 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 p... ...
Canadian Science Publishing - Tập 51 Số 5 - Trang 879-890 - 1973
A METHOD OF ISOLATING ACTINOMYCETES FROM SCABBY POTATO TISSUE AND SOIL WITH MINIMAL CONTAMINATION 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 progressiv... ...
Canadian Science Publishing - Tập 34 Số 1 - Trang 44-47 - 1956
Early abortion of colonies of leaf rust, Puccinia hordei, in partially resistant barley seedlings 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 form... ...
Canadian Science Publishing - Tập 60 Số 5 - Trang 714-723 - 1982
Aquatic plants of acid lakes in Kejimkujik National Park, Nova Scotia; floristic composition and relation to water chemistry 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, El... ...
Canadian Science Publishing - Tập 64 Số 4 - Trang 724-729 - 1986
THE OCCURRENCE OF FUSARIUM SPECIES IN CANADA: IV. TAXONOMY AND PREVALENCE OF FUSARIUM SPECIES IN THE SOIL OF CEREAL PLOTS 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, ... ...
Canadian Science Publishing - Tập 32 Số 5 - Trang 622-629 - 1954
QUANTITATIVE AND QUALITATIVE COMPARISONS OF FUSARIUM POPULATIONS IN CULTIVATED FIELDS AND NONCULTIVATED PARENT SOILS 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 s... ...
Canadian Science Publishing - Tập 43 Số 8 - Trang 939-945 - 1965
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