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  • Angiosperms  (132)
  • Springer  (132)
  • Blackwell Publishing Ltd
  • 1980-1984  (132)
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  • Springer  (132)
  • Blackwell Publishing Ltd
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Single-gene heterozygotes derived from the polygenic pappus part system ofMicroseris hybrid C34 (Asteraceae—Lactuceae) (1984)
    Springer
    Plant systematics and evolution 147 (1984), S. 205-226 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Asteraceae ; Lactuceae ; Microseris ; Pappus part number ; meristic characters ; canalized numbers ; quantitative genetics ; evolutionary genetics ; marker enzymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Microseris strain C34 is a hybrid between the Chilean speciesM. pygmaea (10 pappus parts) and the CalifornianM. bigelovii (5 pappus parts). The plants are propagated by selfing from the original hybrid specimen. Each plant has from 5 to 10 pappus parts per achene with an average value that is additively determined by four unlinked quantitatively acting genes. Single-gene heterozygote sublines have been obtained for two of these,pp-1 (shown to be linked to a modifier of acid phosphatase-1) andpp-4. Sublines homozygous for all four additive genes show residual genetic variation influencing pappus part number. At least one additional gene can be demonstrated by its linkage with leucine aminopeptidase-1. Lines for the further characterization of these hypostatic genes are selected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989384
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  • 2
    Electronic Resource
    Electronic Resource
    The relation between pollen exine sculpturing and self-incompatibility mechanisms (1984)
    Springer
    Plant systematics and evolution 147 (1984), S. 63-78 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Exine morphology ; origin of sporophytic self-incompatibility ; palynology ; pollen wall
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In angiosperm pollen the reticulate-perforate exine sculpturing is associated with sporophytic self-incompatibility (S.S.I.) and imperforate and microperforate exine sculpturing is associated with gametophytic self-incompatibility. The earliest unequivocal angiosperm pollen conforms to exine morphology of pollen from plants with S.S.I. The orgin of S.S.I. is hypothesized to have coincided with the appearance of what is now the earliest recognizable angiosperm pollen. Other angiosperm characteristics correlated with S.I., functional stigmatic areas, large showy flowers (or aggregated inflorescences), and passive seed dispersal, provide some insight into the biological aspects of the earliest angiosperms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984580
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  • 3
    Electronic Resource
    Electronic Resource
    The occurrence of vascular tracheids inBetula and some otherBetulaceae genera (1984)
    Springer
    Plant systematics and evolution 147 (1984), S. 125-131 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Betulaceae ; Betula ; Alnus ; Carpinus ; Corylus ; Wood anatomy ; vascular tracheids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The occurrence of vascular tracheids inBetula, Alnus, Carpinus andCorylus is reported. It is established that the cells are a consistent feature in early and late wood where they are associated with vessel elements in radial multiples. The possible function and taxonomic importance of these cells are briefly considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984585
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  • 4
    Electronic Resource
    Electronic Resource
    NewLiparis species (Orchidaceae) from South Central and East Africa (1983)
    Springer
    Plant systematics and evolution 142 (1983), S. 149-156 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Orchidaceae ; Liparis molendinacea spec. n. ; L. chimanimaniensis spec. n. ; L. nyikana spec. n. ; Flora of Tropical East and South Central Africa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Liparis molendinacea is related toL. deistelii and known so far only from the type locality in Kawambwa district in the Northern Province of Zambia.L. nyikana likewise is related toL. deistelii, it is distributed in E. and SW. Tanzania and in N. Malawi.L. chimanimaniensis is related toL. nervosa and known so far only from the Chimanimani Mountains in the Eastern Province of Zimbabwe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985895
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Entwicklung des Gynoeceums beiBergenia cordifolia (Saxifragaceae) (1984)
    Springer
    Plant systematics and evolution 147 (1984), S. 167-175 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Saxifragaceae ; Bergenia cordifolia ; Gynoecium ontogenesis ; meristem incorporation ; meristem fusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Scanning electron microscopical investigations of flower buds of the perennial herbBergenia cordifolia (Haw.)A. Br. (Saxifragaceae) reveal a primitive gynoecium. During ontogenesis the margins of the carpel lamina transgress on the apical cone of the axis by meristem incorporation and finally fuse with the margins of the opposite carpel. These processes of meristem incorporation and fusion first lead to gamophylly and furthermore to carpel peltation, as is demonstrated by SEM-photographs (ring-shaped dike and common septum of the two carpels). As a result of carpel peltation, the lowest point of the septum deliminates the synascidiate zone. Above this point, the symplicate and, eventually, the plicate zone follows (vid. ventral suture). The margins of the carpel lamina merely touch each other without being coalesced. The preparation of a window in the carpel's dorsal side permits a look at a massive lateral placenta (Leinfellner 1951) developing the ovules. In the lower third—in lateral position at the placenta's margin—the first ovules are seen, the next ones follow in acropetal and basipetal direction, as well as to the periphery of the placenta.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984587
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  • 6
    Electronic Resource
    Electronic Resource
    A comparative study of genomes in angiosperms (1982)
    Springer
    Plant systematics and evolution 139 (1982), S. 209-227 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Dicotyledons ; Monocotyledons ; DNA reassociation kinetics ; fast repeats ; repetitive DNA ; single copy DNA ; short period interspersion pattern ; slow repeats ; genome evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Angiosperms investigated by DNA/DNA reassociation studies were classified and tested for a taxonomic class- and subclass-specifity in a biometrical fashion. Monocotyledons and Dicotyledons differ significantly from each other with respect to a genomic parameter (U/R-ratio;U single copy DNA fraction;R = 1-U fraction of repetitive DNA). This difference is discussed from an evolutionary and molecular point of view.—Intercorrelations between the fraction of fast repeats, slow repeats, and single copy DNA can be detected. The amount of DNA organized in a short period pattern of interspersion is found to depend on the fraction of repetitive and single copy DNA. The number of DNA segments tandemly arranged in a short period pattern is linearly correlated withR/U-values. This correlation allows for a formula suitable for the estimation of the number of active genes in angiosperms. The analytical complexities of repetitive and single copy DNA are linearly correlated with the genome size of higher plants. The ratioU/R depends on the genome size of angiosperms in a hyperbolic fashion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989326
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  • 7
    Electronic Resource
    Electronic Resource
    DNA sequence organization and RNA complexity inMatthiola incana (Brassicaceae) (1982)
    Springer
    Plant systematics and evolution 140 (1982), S. 75-86 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Brassicaceae ; Matthiola incana.—DNA interspersion pattern ; Messenger RNA ; RNA complexity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The DNA of the cruciferMatthiola incana (Brassicaceae, Capparales) has been investigated for the pattern of sequence interspersion and RNA transcription. A short period pattern of interspersion (Xenopus-like interspersion pattern) is predominant (60%). Similar to a series of other Angiosperms (tobacco, soybean, parsley and some cereals) repetitive clusters orinter-se interspersion patterns of repetitive DNA occur inMatthiola genome and amount to 12%. From the hybridization of single copy DNA with poly(A)−-RNA and from cDNA/poly(A)+-RNA and cDNA/poly(A)−-RNA hybridizations a number of about 9,400 active genes can be estimated forM. incana seedlings. Both RNA constituents (poly(A)+-RNA and poly(A)−-RNA) contain mainly the same protein-coding mRNA sequences. Total mRNA is amounting to about 4% of theM. incana RNA population. A total of 1.2% (or about 30% of mRNA) of theM. incana RNA is represented by polyadenylated mRNA sequences. About 3.6% of single copy DNA hybridizes with poly(A)−-RNA. Approximately 7% of theM. incana genome, organized in a short period pattern of DNA sequence interspersion, is transcribed into RNA sequences (mRNA). About 6% of clustered repetitive DNA is expressed into RNA sequences such as rRNA and tRNA. Approximately 1.6 × 106 rRNA, 1.75 × 107 tRNA and 3.7 × 105 mRNA molecules are present perMatthiola seedling cell. The transcription rate of single rRNA and tRNA genes can be estimated to be about 1,400 or 1,100 copies per gene, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02409898
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  • 8
    Electronic Resource
    Electronic Resource
    Electrophoretic identification of polyploidCamellia japonica (Theaceae) cultivars and evidence for their sexual origin (1984)
    Springer
    Plant systematics and evolution 145 (1984), S. 223-226 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Theaceae ; Camellia japonica ; Allozymes ; polyploidy ; origin of cultivars
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Electrophoretic examination of allozymes from 189Camellia japonica cultivars revealed some banding patterns not explainable by codominant diploid genetics. At several loci encoding dimeric enzymes, 5 and 6 banded patterns were observed in 7 cultivars. These patterns are interpreted as resulting from triploidy or aneuploidy, where three variant alleles code for products which are electrophoretically distinguishable and associate to form three homodimers and three heterodimers. The presence of allozyme multiplicity in these clones suggests a sexual rather than a somatic mode of triploid origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983950
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  • 9
    Electronic Resource
    Electronic Resource
    The systematic relationships ofAegialitis (Plumbaginaceae) as revealed by pollen morphology (1984)
    Springer
    Plant systematics and evolution 144 (1984), S. 53-58 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Plumbaginaceae ; Aegialitis annulata ; A. rotundifolia ; Plumbago rosea ; Monomorphic pollen ; exine sculpturing ; systematic position
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Light and first SEM observations on the pollen ofAegialitis indicate that the two species of the genus are clearly distinguishable from all other genera of the tribeStaticeae to whichAegialitis presently is relegated. Intraspecific exine or aperture dimorphism which appears frequently in this tribe, is not recorded in this genus.A. annulata andA. rotundifolia have distinct monomorphic pollen and show a great resemblance in exine features with the tribePlumbagineae, particularly species ofPlumbago. Considering these and other features, separate subtribal status forAegialitis within thePlumbagineae is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00990800
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Ultrastruktur und Funktion pollenverbindender Fäden beiEricaceae und anderen Angiospermenfamilien (1984)
    Springer
    Plant systematics and evolution 147 (1984), S. 189-203 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Ericaceae ; Onagraceae ; Mimosaceae ; Musaceae ; Ultrastructure ; function of pollen connecting threads and viscin threads ; palynology ; pollination ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Viscin threads and other pollen connecting threads of some angiosperm families were investigated, especially those ofEricaceae. According to the definition adopted, viscin threads are ± long exinous processes which consist of exinous material and connect pollen grains or tetrads. Such viscin threads are found within theOnagraceae, Caesalpiniaceae, Ericaceae, andMimosaceae only. While they differ in structure and composition, they always consist of sporopollenin and exhibit a very strong stickiness, even after all viscid substances have been removed by acetolysis. In contrast, the pollen connecting scleroprotein threads ofOrchidaceae and the cellular threads ofStrelitzia reginae Aiton. (Musaceae) are not connected with the exine surface, are destroyed by acetolysis, and thus do not correspond to viscin threads.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989383
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