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  • 1
    Electronic Resource
    Electronic Resource
    Hybrid variegation in the genus Pelargonium (1982)
    Springer
    Current genetics 5 (1982), S. 245-249 
    Details
    ISSN: 1432-0983
    Keywords: Hybrid variegation ; Pelargonium ; Extranuclear inheritance ; Plastid DNA ; Restriction patterns
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary. 1) The genetical and cytological analysis of crosses between the wild-type form ‘Roseum’ of Pelargonium zonale (L.) L 'Herit. ex Ait. and the hybrid species Pelargonium zonale hort. ‘Stadt Bern’' revealed the occurrence of hybrid variegation in the genus Pelargonium 2) The plastids in the green-white variegated plants were sorted out in the quick apical way characteristic for Pelargonium chimera. Six types of periclinal chimeras could be observed. 3) The DNAs of the two different plastomes can be distinguished by restriction endonuclease analysis with EcoRl and BamHI. 4) The differences in the cleavage patterns allowed a detailed description of the process of sorting out of the two parental plastids types within the variegated hybrids on the level of their plastid DNA. In all cases observed the cleavage pattern of ‘Roseum’ plastid DNA was found in the green tissue and the pattern of ‘Stadt Bern’ plastid DNA in the white tissue. 5) From these results we draw the conclusion that there is a disharmony between the F1-hybrid nucleus and the plastome of Stadt Bern', which blocks the normal differentiation of ‘Stadt Bern’ plastids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391813
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  • 2
    Electronic Resource
    Electronic Resource
    Über den Verzweigungsvorgang beiPsilotum undSelaginella mit Anmerkungen zum Begriff der Dichotomie (1980)
    Springer
    Plant systematics and evolution 133 (1980), S. 181-197 
    Details
    ISSN: 1615-6110
    Keywords: Pteridophyta ; Psilotum triquetrum ; Selaginella speciosa ; Apical shoot meristems ; apical initials ; meristem fractionation ; isotomous and anisotomous branching
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract After a critical evaluation of the concept of dichotomous branching in Cormophytes the shoot apical meristems ofPsilotum triquetrum andSelaginella speciosa are described. InPsilotum only the terminal meristems of the cryptophilic shoots have a three sided apical cell. Those of the photophilic shoots lack a typical apical cell.Selaginella has a two sided apical cell. The process of branching is independent from apical cells. It is due to an equal or unequal fractionation of the initial zone of the shoot apex which embraces all tissues above the leaf producing zone of the apical meristem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984379
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  • 3
    Electronic Resource
    Electronic Resource
    BesitztAnemia Sori? Untersuchungen über die Entwicklung des Sporophylls vonAnemia phyllitidis (Schizaeaceae) (1983)
    Springer
    Plant systematics and evolution 143 (1983), S. 133-150 
    Details
    ISSN: 1615-6110
    Keywords: Pteridophyta ; Schizaeaceae ; Anemia phyllitidis ; Phylogeny ; ontogeny ; sporophyll ; pinnate leaf ; marginal meristem ; meristem fractionation ; direction of coiling ; development ; initiation ; sporangium ; indusium ; sorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Observations of young fertile leaf primordia provide information about the development of the sporophyll ofAnemia phyllitidis Sw. The marginal meristem which surrounds the leaf primordium forms the pinna primordia, firstly the two “spore pinnae” by meristem fractionation. These are turned with their adaxial side towards the leaf apex and continue marginal meristem fractionations until products of the 5th order are formed.—In the sporophyll development two events are significant: (1) The fractionation products of the 2nd order reverse their direction of coiling. (2) From the marginal meristem of the fractionation products of the 5th order the sporangia arise in acropetal succession each originating from one initial cell.—Three observations—the fractionation products of the 2nd order being accessory outgrowths of the leaf margin, their reversed coiling direction, and the aggregation of the sporangia on the last segments—lead to the following concept of a sorus type: Each fractionation product of the 2nd order represents a marginal acropetal sorus with a branched receptaculum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984116
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