摘要:

Secondary metabolism is the biosynthesis, transformation, and degradation of a wide array of natural products. These low molecular weight organic compounds are generally produced at a restricted phase of the life cycle, often in association with differentiated morphological structures. No unified theory to explain the function of secondary metabolism in the producing organism has been accepted, however one hypothesis that has received widespread attention views secondary metabolites as initiatiors or coordinators of spore formation. A review of the literature indicates that there is ample experimental evidence to nullify this hypothesis. Although secondary metabolite production is often correlated with morphological differentiation, it is not the cause of it. Cellular and chemical differentiation can both be comprehended as different aspects of biological diversification, mediated by Darwinian evolutionary forces.

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1983.tb00450.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The nature of definitions is discussed, and a working definition of “biochemical differentiation” proposed. Using this definition, the sequential and parallel events controlling “biochemical differentiation” in four systems is described, and the similarities to secondary metabolis

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1983.tb00451.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

A principle role of mycotoxins may be in the establishment of fungi in various ecological niches. Mycotoxins may have a multiplicity of functions. They may function as antibiotics, as chemical signalling agents, as mutagenic agents and in other ways. The outcome of ecological competition may have evolutionary and biochemical taxonomic significance.

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1983.tb00452.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The association between asexual development and aflatoxin production in Aspergillus parasiticus is reviewed. Aflatoxin does not appear to be a product of asexual development. The ability to sporulate and to produce aflatoxin are not mutually exclusive of each other. The environment regulates the asexual development and aflatoxin production. The initial inoculum level will affect the competence time and the time of initiation of aflatoxin production. The time of initiation of aflatoxin production is independent of the initial composition of the medium, in contrast to the onset of sporulation which is dependent on the medium.

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1983.tb00453.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Zearalenone, a phytoestrogen produced by various species of Fusarium, regulates perithecial formation in F. roseum ‘Graminearum’. The response is concentration dependent, enhancing at low concentrations (1–10 ng) and inhibiting at high concentrations (10–100 μg). The biological activity can be modified by varying the chemical structure of the parent molecule. Zearalenone binds to mammalian estrogen receptor protein competitively with estradiol. Conversely estradiol binds to specific receptor protein from Fusarium

ISSN:0149-6085    

DOI:10.1111/j.1745-4565.1983.tb00454.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY