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  • Oryza sativa  (3)
  • Monkey  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Theoretical and applied genetics 86 (1993), S. 1038-1042 
    ISSN: 1432-2242
    Schlagwort(e): Oryza sativa ; Indica-Japonica hybrid ; Hybrid sterility ; Female sterility
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The genetic model for hybrid sterility that an allelic interaction at the S 5 locus induces the abortion of megaspores has been proposed as partial clarification of the wide compatibility in Asian rice cultivars; this model predicts the presence of an egg-killer. The present study was carried out in order to confirm that the proposed S 5 i allele acts as an egg-killer against its counterpart, the S 5 j allele, in the Indica-Japonica hybrid. A conspicuous feature of an egg-killer is the high rate of its transmission into the progeny through the egg. Backcrossing experiments were conducted using the Indica-Japonica hybrid in which the S 5 i and S 5 j alleles were assumed to be involved. Although an egg-killer was easily identified by these backcross experiments, it was not detected in the Indica-Japonica hybrid, which suggests that the proposed genetic mechanism for hybrid sterility in Asian rice should be viewed with caution.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular evolution 38 (1994), S. 132-137 
    ISSN: 1432-1432
    Schlagwort(e): Plant SINE ; retroposon ; Rice evolution ; wx locus ; Oryza sativa ; PCR ; Repetitive sequences
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A new type of plant retroposon, p-SINE1, has been found in the wx locus of rice (Oryza sativa). It has some structural characteristics similar to those of mammalian SINEs, such as members of the Alu or Bl family. In order to estimate the time at which the integration of p-SINE1 into a single locus occurred during rice evolution, we examined the distribution of two members of p-SINE1 in several species of the Oryza genus by the polymerase chain reaction (PCR). We found that one member of p-SINE1 (p-SINE1-r2) in the ninth intron of the wx + gene was present only in two closely related species, O. sativa and O. rufipogon, and was not present in the other species carrying the AA genome within the Oryza genus. This result indicates that p-SINE1-r2 was integrated into the wx locus after O. sativa and O. rufipogon had diverged from other species with the AA genome. In contrast to p-SINE1-r2, another member (p-SINE1-rl) located in the untranslated 5′-region of the wx + gene was present not only in all species with the AA genome but also in species with a different genome (CCDD). This result suggests that p-SINE1-rl was integrated into that position prior to the genomic divergence. Thus, it appears that each member of p-SINE1 was retroposed at a specific site at a different time during rice evolution.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Anatomy and embryology 166 (1983), S. 155-168 
    ISSN: 1432-0568
    Schlagwort(e): Serotonin ; Neocortex ; Visual cortex ; Monkey ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Using a peroxidase-antiperoxidase immunohistochemical method, the distribution of serotonin nerve fibers was studied in the neocortex of the monkey (Macaca fuscata). All layers of the neocortex showed evidence of serotonin fibers, both fine and thick. Unlike the distribution in rodents, different patterns of distribution were noted in each neocortex of the primate. Among the cortical areas — area 4, 3-1-2, 17, 18, 41 and 42 — the primary visual cortex (area 17) contained the highest density of immunoreactive fibers, while the primary motor cortex (area 4) possessed the lowest concentration. The most outstanding finding was a dense and laminar distribution of serotonin fibers in area 17, particularly within the upper portion of layer IVc. In area 3-1-2, 18, 41 and 42, a fairly uniform density of immunoreactive fibers was observed across the six cortical layers, apart from a relatively dense plexus of fine serotonin fibers in layer IV.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Anatomy and embryology 167 (1983), S. 321-333 
    ISSN: 1432-0568
    Schlagwort(e): Serotonin ; Immunohistochemistry ; Brainstem ; Motoneuron ; Monkey
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary A comparative study of serotonergic innervation on motoneurons in the brainstem of various mammals (mouse, rat, guinea pig, dog, cat and monkey) was carried out using a sensitive immunohistochemical method. Except for the extraocular muscle nuclei, the motor nuclei of the cranial nerves received rich inputs from serotonin neurons, in all species examined — rodent, carnivore and primate. The motoneurons of the monkey were innervated by varicose serotonin fibers, in a manner different from that of other species, i.e. their cell bodies and proximal dendrites were tightly encircled by a large number of serotonin-containing varicose fibers. At the ultrastructural level, a predominant population of axosomatic contacts was confirmed in the cranial motor nuclei of the monkey, particularly in the nucleus ambiguus.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Theoretical and applied genetics 68 (1984), S. 467-473 
    ISSN: 1432-2242
    Schlagwort(e): Oryza sativa ; O. glaberrima ; Wx gene expression ; Amylose content ; Electrophoresis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary In order to examine the effects of different alleles on the gene expression at the waxy locus, the Wx gene product which controls the synthesis of amylose was isolated from endosperm starch of rice plants and analysed by electrophoretic techniques. The major protein bound to starch granules was absent in most of waxy strains and increased with the number of Wx alleles in triploid endosperms, suggesting that the major protein is the Wx gene product. In addition to wx alleles which result in the absence or drastic reduction of the Wx gene product and amylose, differentiation of Wx alleles seemed to have occurred among nonwaxy rice strains. At least two Wx alleles with different efficiencies in the production of the major protein as well as amylose were detected. These alleles are discussed in relation to regulation of the gene expression.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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