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  • Developmental mutants (moss)  (1)
  • Protoplast regeneration  (1)
  • 1
    ISSN: 1432-2048
    Keywords: Bryophyta ; Developmental mutants (moss) ; Moss protonemata ; Mutant (moss) ; Phototropism (moss) ; Physcomitrella ; Phytochrome (moss) ; Polarotropism (moss)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phototropic and polarotropic responses of primary chloronemata grown from germinated minated spores of three mutant strains of the moss, Physcomitrella patens, have been studied and compared with those of the wild-type. The mutants and wild-type show the same qualitative tropic responses but differ with respect to the light conditions under which they are expressed. In both the wild-type and mutants the responses are controlled by phytochrome. In monochromatic red light, at low fluence rates, wild-type primary chloronemata grow positively phototropically in unidirectional light or perpendicular to the electrical vector (E) in polarised light; at high fluence rates growth in unidirectional light is lateral to the incident light or, in polarised light, parallel to E. The mutants, however, show only the lateral phototropic or parallel polarotropic responses at all fluence rates of red light tested. In far-red light, the wild-type primary chloronemata adopt a positive phototropic or a perpendicular polarotropic response; the mutants show the same responses but in a lower percentage of filaments. These results and those at other wavelengths indicate either that the mutants are impaired in their ability to adopt the positive phototropic and perpendicular polarotropic responses or that in the mutants the transition between the “low light” (positive phototropic-perpendicular polarotropic) and the “high light” (lateral phototropic-parallel polarotropic) responses is shifted to a lower photon fluence rate. Possible explanations of this phenotypic difference are discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Planta 157 (1983), S. 39-45 
    ISSN: 1432-2048
    Keywords: Bryophyta ; Light and regeneration ; Moss protoplast ; Physcomitrella ; Polarity (cell regeneration) ; Protoplast regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Protoplasts prepared by enzymic treatment of protonemata of the moss Physcomitrella patens regenerate rapidly in white light (15 W m−2). The great majority of protoplasts follow a simple regenerative sequence, namely: cell wall synthesis; formation of an asymmetric cell; division of the asymmetric cell, and further extension and division to produce a new chloronemal filament. Only cell wall formation occurs independently of light. The production of an asymmetric cell requires relatively high photon fluence rates of blue or red light and ceases upon transfer to darkness. The subsequent stages of regeneration require much lower photon fluence rates, and red light is considerably more effective than blue or far-red light in permitting cell division. This system is of interest in the study of the induction of cell polarity in plants.
    Type of Medium: Electronic Resource
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