The development of cirri and bristles during binary fission in the ciliate Euplotes eurystomus

✍ Scribed by John Tyler Bonner

• Publisher: John Wiley and Sons
• Year: 1954
• Tongue: English
• Weight: 815 KB
• Volume: 95
• Category: Article
• ISSN: 0362-2525
• DOI: 10.1002/jmor.1050950105

✦ Synopsis

TIIREE FIGURES

I t has long been known that one of tlie most curious and enigiiiatic problems in morplrogenesis lies in the development of the superficial organelles of ciliated protozoa and iiiany workers have contributed niuch information on this subject ivhich may be found reviewed in nunierous places, for esample, Balamuth ( '40), Summers ( '41), FaurBE'remiet ( '4S), Lwoff ( '50), and Weisx ( ,Sl). The problem has involved in part a search for the influence of the nucleus on the cytoplasmic structures, and recently Sonneborn ( '50) and Tl'eisz ( '31) have made notable contributions along these lines, and in part the self-perpetuating properties of the cytoplasmic organelles which Chattoii and Lwoff (see Lwoff '50) have so well shown in the evidence for their theory of the genetic continuity of the basal granules or kinetosoiiies. They have demonstrated that not only do the various structures such as buccal membranelles, trichocysts, and cirri all originate from the basal granules which are capable of division and migration at the surface of the cell, but also that there is a direct continuit)of these basal granules from generation to generation and that it is unlikely that they can arise de wovo. These basal gi-aiiules and their attendant structures form a wide 1-ariety 'rhi9 work 'ivas done 011 n travelling fellowship from the Rockefeller Foundation at tlie laboratory of Professor E. FnurF-Fremiet (Laboratorie d'Enibryog6uie ConiparFe, Collhge de France, Paris). I should like to express here my sincere thanks to Professor Fanr6-Freiniet for his generous hospitality and his kind help.