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Additional resources for CURRENT TOPICS IN DEVELOPMNTL BIOLOGY V6, Volume 6

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After the axoneme has been withdrawn, the membranous sheath is no longer associated with it (Fig. 4A, arrow). Since the sheath is continuous-and probably identical-with the plasma membrane, it seems highly likely that the membranous sheath is retained as part of the plasma membrane after flagellar retraction. This conclusion is, we think, indirectly strengthened by the fact that the axonemal sheaths in some other water molds also seem to have a similar fate, judging from the observations of Meir and Webster (1954) who noted that hairs on the flagella of primary zoospores of some Saprolegniaceae seem to appear on the cysts derived from them, and the conclusion of Fuller and Reichle (1965) that laterally projecting “flimmer filaments” (mastigonemes) attached to the axonemal sheath of Rhizidiomyces apophysatus are subsequently observed on part of the cyst surface after flagellar retraction.

1970). As a consequence, very large vesicles are produced that contain two or more of the decaying gamma matricies ; the latter eventually break up completely into smaller vesicular elements, some of which fuse with the membranes of the parent vesicle. This large expanded membrane, in turn, buds off vesicles that can migrate to the surface of the spore and fuse with it; they are detectable up to a t least 2 hours after encystment. VI. Punctuation on Three Important Structural Changes in Germination The breakdown of certain, specific, cytoplasmic membranes is a crucial step in the germination of B.

Spores encyst normally, nuclear cap membranes fragment, and ribosomes scatter throughout the cytoplasm as usual, but the germ tube does not form and the retracted flagellar axoneme does not disappear. Although germination does not proceed as far as it does in the presence of actinomycin D, the structural changes of encystment apparently require only the protein and RNA found in a nongerminating zoospore. One obtains the impression that the spore has all the necessary ingredients for encystment packaged and waiting, and that some signal is needed for it to start using them.

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