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  • 1
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. At least part of trisporic acid (TA) synthesis in a mated culture of the fungus Blakeslea trispora proceeds by secretion of mating-type-specific precursor molecules by both mating types, and conversion of these molecules to TA by the mating partner. 2. The contribution of the minus strain to TA synthesis is dependent on the amount of plus mycelium present. On the other hand, the contribution of the plus strain is influenced by the biosynthetic activity of the minus mycelium 3. This mutual stimulation of both sexual partners is abolished by 5-fluorouracil.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2048
    Keywords: Chlorosis ; Ferritin ; Iron metabolism ; Phaseolus (ferritin)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Normal green leaves contain low levels of ferritin which stores 5 to 10% of the total iron (approximately 350 iron atoms/molecule). Chlorotic leaves do not have measurable amounts of ferritin, whereas iron-loaded leaves contain high levels of well-filled ferritin (1,500 to 2,500 iron atoms/molecule). The role of ferritin during a transient iron surplus in leaves was investigated. It is suggested that a short-term overdose of iron transported into the leaf is largely stored in or near the vessels in such a form that it can be quickly mobilized for export. Iron that reaches the mesophyll cells in an overdose situation is stored in ferritin and, when released, is most likely used for the leaf cells themselves and not for export.
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  • 3
    ISSN: 1432-2048
    Keywords: Autogamy ; Chlamydomonas ; Gametogenesis ; Mating ; Sexual interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mating between cells of opposite mating type within a clonal population of Chlamydomonas monoica results in thick-walled zygotes. Zygote formation was studied in cells from continuous cultures fed with culture medium containing nitrate concentrations sufficient or limiting for growth. The factors that were considered were cell density and nitrate content of the medium. The following results were obtained: (i) Zygotes were only formed by cells that had experienced a relatively low nitrogen level that did not limit cell division. (ii) Cells were competent to mate only during a limited period of time after their release from the mother cell wall. (iii) There was a correlation between zygote yields and the number of low-nitrogen cells that were able to execute a cell division under the conditions being tested. (iv) The zygote yield per cell division was independent of the cell density. These findings indicate that the strategy used by C. monoica cells to find a mate is not dependent on random encounters. A possible explanation is that at least a large proportion of zygotes is formed by matings between cells originating from the same mother cell (siblings).
    Type of Medium: Electronic Resource
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