Saclike संरचना जिसमें Acospores Ascomycetes के यौन प्रजनन के माध्यम से गठित किया जाता है

Noun:

ASCUS,

ascus's Usage Examples:

of the simpler forms, is a very sharply marked group characterized by a special type of sporangium, the ascus.

This mode of sporeformation is totally different from that in the ascus; hence one of the difficulties of the acceptance of Brefeld's view of the homology of ascus and sporangium.

In young asci a similar fusion of two nuclei occurs, and also in basidia, in each case the nucleus of the ascus or of the basidium resulting from the fusion subsequently giving rise by division to the nuclei of the ascospores and basidiospores respectively.

Ascus from perithecium containing six spores, X30o.

ascophorous, producing asci; ascospore, the spore (or sporule) developed in the ascus; ascogonium, the organ producing it, 'c.

In a few cases both among the higher and the lower plants, of which the formation of spores in the ascus is a typical example, new cells are formed by the aggregation of portions of the cytoplasm around the nuclei which become delimited from the rest of the cell iontents by a membrane.

Single ascus, more enlarged, showing the eight contained spores.

On this basis, with other interesting morphological comparisons, Brefeld erected his hypothesis, now untenable, that the Ascomycetes and Basidiomycetes diverge from the Zygomycetes, the former having particularly specialized the ascus (sporangial) mode of reproduction, the latter having specialized the conidial (indehiscent one-spored sporangiole) mode.

According to his view, the ascus is in effect the sporangium with several spores, the conidium the sporangiole with but one spore, and that not loose but fused with the sporangiole wall.

The ascus is thus one of the most sharply characterized structures among the fungi.

ascus's Meaning':

saclike structure in which ascospores are formed through sexual reproduction of ascomycetes