Transplantation of Killer Endosymbionts in Paramecium
نویسندگان
چکیده
منابع مشابه
Simultaneous Evaluation of Life Cycle Dynamics between a Host Paramecium and the Endosymbionts of Paramecium bursaria Using Capillary Flow Cytometry
Endosymbioses are driving forces underlying cell evolution. The endosymbiosis exhibited by Paramecium bursaria is an excellent model with which to study symbiosis. A single-cell microscopic analysis of P. bursaria reveals that endosymbiont numbers double when the host is in the division phase. Consequently, endosymbionts must arrange their cell cycle schedule if the culture-condition-dependent ...
متن کاملThe killer trait of Paramecium and its causative agents1
Some paramecia express the so-called killer trait: killer paramecia release toxic particles into the environment and these particles kill sensitive Paramecium cells after ingestion. These particles are bacteria belonging to the genus Caedibacter, endosymbionts of killer Paramecium strains. A peculiarity of Caedibacter is the presence of an unusual structure termed R-body (refractile body) due t...
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The killer trait in Paramecium aurdia depends upon the presence of a cytoplasmic genetic particle, kappa (1). Animals possessing kappa liberate into the culture medium in which they live a poison, paramecin, to which they themselves are resistant; animals lacking kappa are killed by this substance. Stained preparations and phase microscope observations of fixed and unfixed kappa reveal, in stoc...
متن کاملThree different types of mate-killer (mu) particle in Paramecium aurelia (syngen 1).
A new rapid method for staining endosymbiotic particles in Paramecium is described. Two new strains of mu particle in P. aurelia syngen i are compared with the previously known mu particles of stock 540 by light and electron microscopy. Morphologically the three types of particle differ only in size, but each converts its host Paramecium into a mate-killer of a specific type. Each of the three ...
متن کاملBacterial endosymbionts in animals.
Molecular phylogenetic studies reveal that many endosymbioses between bacteria and invertebrate hosts result from ancient infections followed by strict vertical transmission within host lineages. Endosymbionts display a distinctive constellation of genetic properties including AT-biased base composition, accelerated sequence evolution, and, at least sometimes, small genome size; these features ...
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ژورنال
عنوان ژورنال: Nature
سال: 1973
ISSN: 0028-0836,1476-4687
DOI: 10.1038/241127a0