apogamy

This system of reproduction is called apogamy.

These results demonstrate that both ethylene and a utilizable carbohydrate are required for apogamy.

See also parthenogenesis and apogamy below.

Studies in spermatogenesis and apogamy in ferns.

In flowering plants, the cells involved in apogamy would be synergids or antipodal cells.

The fern reproduces asexually by apogamy.

The gametophyte–sporophyte junction had a direct connection between the gametophyte and sporophyte tissues and lacked a foot, which is typical for apogamy.

Nelson) Butters resulting from induced apogamy, the chromosomes did not pair during prophase I and separated randomly, usually into two groups.

Tmesipteris, Psilotaceae, apogamy, sporophyte, gametophyte.

Key words: apogamy, archegonia, Cephalozia, Diplophyllum, ectoparasitism, parthenogenesis, Scapania.

The new embryo may then arise either from the egg (haploid parthenogenesis) or from some other cell of the gametophyte (haploid apogamy).

This has been hypothesized to occur by apogamy, yielding triploid spores and gametophytes which then grow directly into a new generation of triploid sporophytes.

Her doctorate research focused on the reproduction and cell biology of ferns, particularly the phenomenon of apogamy (formation of an embryo without fertilization) (Allen, 1914).

Panigrahi, G. (1962a) Cytogenetics of apogamy in Aleuritopteris farinosa (Forsk.)

In A. x ebenoides (as distinct from A. tutwilerae), the sterile spores are malformed, although viable spores can apparently form by apogamy on rare occasions.

Some individuals of this species are diploid and reproduce sexually, while some are triploid or tetraploid and reproduce by apogamy (growth of a plant from a gamete without fertilization).

Ruth F. Allen received her Ph.D. in Botany from the University of Wisconsin in 1909, with her thesis titled "Studies in spermatogenesis and apogamy in ferns".

Adding 1 μl/liter ethylene to each concentration of carbon dioxide reversed the inhibition and some apogamy did occur in gametophytes grown in 7% carbon dioxide supplied concomitantly with the exogenous ethylene.

Apogamy: Although this term was (before 1908) used for other types of apomixis, and then discarded as too confusing, it is still sometimes used when an embryo develops from a cell of the megagametophyte other than the egg cell.

The gametophytes of bryophytes, and less commonly ferns and lycopods can develop a group of cells that grow to look like a sporophyte of the species but with the ploidy level of the gametophyte, a phenomenon known as apogamy.

By analogy with apogamy and apospory in mosses and pteridophytes that are induced by media supplemented with organic nutrients and growth regulators, we suggest that the abnormal structures in Cephalozia resulted from substances produced by Mniaecia.

He does so with works from his new "Apogamy Pods" series of transfer paintings, using the botanical term for asexual reproduction among ferns as he empties out his art to such an extent that his stark "White Paintings" from the 1950's come to mind.