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  • 1
    Electronic Resource
    Electronic Resource
    Ethylene is involved in the autochemotropism of Phycomyces (1977)
    Springer
    Planta 134 (1977), S. 61-66 
    Details
    ISSN: 1432-2048
    Keywords: Autochemotropism ; Avoidance response ; Ethylene ; Phycomyces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The sporangiophore of the fungus Phycomyces blakesleeanus has the property of growing away from a barrier which is few mm from the growing zone of the sporangiophore (avoidance or autochemotropic response). A model has been published (Cohen, R.J., Jan, N.Y., Matricon, J., Delbrück, M.: J. Gen. Physiol. 66, 67–95 (1975)). To explain the avoidance response which postulates that the sporangiophore emits and readsorbs a volatile growth-promoting effector (gas X) and that the barrier modifies the effector distribution by acting as an aerodynamic obstacle, causing a higher concentration of gas X on the side of the sporangiophore closer to the barrier. From this model we deduced three properties of the gas X. Of the several gases tested (N2, CO2, CH4, C2H2, C2H4, C2H6) only ethylene (C2H4) had all these three properties, a finding which suggests that it has a role in the avoidance response (autochemotropism).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390096
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  • 2
    Electronic Resource
    Electronic Resource
    The role of retinol in the initiation of sporangiophores of Phycomyces blakesleeanus (1979)
    Springer
    Planta 146 (1979), S. 257-262 
    Details
    ISSN: 1432-2048
    Keywords: β-Carotene mutants ; Oxygen requirement ; Phycomyces ; Retinol ; Sporangiophore initiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The initiation of sporangiophores of Phycomyces was analyzed under oxygen-limiting conditions. Mutants lacking β-carotene have a higher oxygen threshold than the wild type depending on the residual amount of β-carotene. The supersensitivity to low oxygen tension is specific for sporangiophore initiation and can be suppressed by addition of either retinal, retinol or retinol acetate to the medium. It is suggested that retinol is a natural regulator of differentiation in Phycomyces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387795
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Mycelial elongation and sporulation of two fungi on amended media in light or dark (1993)
    Springer
    Antonie van Leeuwenhoek 63 (1993), S. 23-27 
    Details
    ISSN: 1572-9699
    Keywords: 6-benzyladenine ; Botrytis allii ; caffeic acid ; chlorogenic acid ; Colletotrichum dematium ; kinetin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Botrytis allii andCollectotrichum dematium are onion pathogens which can infect in the field and cause decay in storage. Some phenolics can hinder development of these fungi, but the effect of cytokinins is not clear. Cytokinins (kinetin or 6-benzyladenine) or phenolics (caffeic or chlorogenic acids) were added to agar at concentrations of 0 to 10−3 M. Cultures were continuously irradiated with fluorescent light or maintained in the dark for 6 days. On unamended media, final mycelial elongation was 45 or 17.8 mm and sporulation was 28 or 10.6 × 104 spores/ml forBotrytis andColletotrichum, respectively. ForBotrytis, mycelial elongation was slightly (5%) but significantly increased and sporulation increased by 21% by incubation on phenolics as compared to cytokinins. Mycelial extension ofColletotrichum was not affected by amendment. Sporulation ofColletotrichum on kinetin was 16 to 28% greater than on the other amendments. As amendments concentration increased elongation of mycelia of both fungi decreased. Sporulation ofBotrytis increased by 60% as amendment concentration increased from 0 to 10−5 M and then decreased 25% at 10−3 M. As amendment concentration increased from 0 to 10−3 M, sporulation ofColletotrichum increased by 45%. Incubation in light increased mycelial extension 3 to 17% forBotrytis andColletotrichum respectively, and sporulation was increased approximately 78% for both fungi. These compounds do not appear to inhibit development of theseBotrytis orColletotrichum species in culture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00871727
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    Paper (German National Licenses)
    Fulltext
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