एक संयंत्र बीजाणु दो समान यौन कोशिकाओं द्वारा बनाई गई

Noun:

संयुक्‍त जीवाणु, प्रसम जीवाणु, युग्‍मज,

zygospore's Usage Examples:

Conjugation of adults has been observed in several species, the most complete account being that of Zederbauer on Ceratium hirundinella (marine): either mate puts forth a tube which meets and opens into that of the other (as in some species of Chlamydomonas and Desmids); the two cell-bodies fuse in this tube, and encyst to form a resting zygospore.

In Zygnemaceae and Mesocarpaceae the zygospore, after a period of rest, germinates, to form a new filamentous colony; in Desmidiaceae its contents divide on germination, and thus give rise to two or more Desmids.

The germination of a zygospore or oospore is effected by the rupture of an outer cuticularized exosporium; then the cell may protrude an inner wall, the endosporium, and grow out into the new plant (Vaucheria), or the contents may break up into a first brood of zoospores.

When two similar zoogametes fuse, the process is conjugation, and the product a zygospore (Gr. ?"vy6, yoke).

(1904); "Zygospore germination in the Mucorineae," Annales mycologici (1906).

Germinating zygospore with a germtube bearing a sporangium.

Ripe zygospore (b) between the suspensors (a).

Different stages in the formation and germination of the zygospore.

Solenia, Cyphella - and even simpler cases are met with in Mortierella, where the zygospore is invested by the overgrowth of a dense mat of closely branching hyphae, and in Gymnoascus, where a loose mat of similarly barren hyphae covers in the tufts of asci as they develop.

Whether a spore results from the sexual union of two similar gametes (zygospore) or from the fertilization of an egg-cell by the protoplasm of a male organ (oospore); or is developed asexually as a motile (zoospore) or a quiescent body cut off from a hypha (conidium) or developed along its course (oidium or chlamydospore), or in its protoplasm (endospore), are matters of importance which have their uses in the classification and terminology of spores, though in many respects they are largely of academic interest.

zygospore's Meaning':

a plant spore formed by two similar sexual cells