Reproduction in diatoms can take place by two different processes, sexual and asexual. The following article will help you to gain information regarding subject of reproduction in these tiny single-celled algal species.
Sexual reproduction of a pinnate diatom (morphological isogamy, physiological anisogamy) Reproduction and cell size. Reproduction among these organisms is asexual by binary fission, during which the diatom divides into two parts, producing two "new" diatoms with identical genes.
Diatom Reproduction. The ability to reproduce sexually is closely associated with cell size. It is the most prevalent method of restoring cell size, and is often triggered when the size of a cell is less than a critical level (usually smaller than half of the original size for most species).
ADVERTISEMENTS: In this article we will discuss about:- 1. Description of Diatoms 2. Characteristics of Diatoms 3. Classification 4. Occurrence 5. Plant Body 6. Cell Structure 7. Reproduction 8. Economic Importance. Description of Diatoms: It is a large group of algae consisting of 200 genera and over 10,000 species, out of which 92 genera and […]
Diatom, (class Bacillariophyceae), any member of the algal class Bacillariophyceae (division Chromophyta), with about 16,000 species found in sediments or attached to solid substances in all the waters of Earth. Diatoms are among the most important and prolific microscopic sea organisms and serve directly or indirectly as food for many animals.
Reproduction. Diatoms like all of protists are able to undergo sexual and asexual reproduction; also, like all protists they predominately reproduction asexually. The mechanism they use to reproduce asexually is simple mitosis. But they have a slight problem. They are incased in a class shell.
Thus, after several rounds of reproduction. The population of diatoms will be smaller than the original. Thus, to avoid a size-reduction or re-establish the original size of the diatom population, sexual reproduction must occur. Since the vegetative cells of diatoms are diploid, haploid gametes can be produced via meiosis.
In the 'centric' diatoms (a paraphyletic group of basal lineages), sexual reproduction is oogamous, i.e. fertilization occurs between small motile sperm and larger immobile eggs, as in the illustration. Pennate diatoms, on the other hand, are usually isogamous, with similar large, non-flagellate, amoeboid gametes.
It is the most prevalent method of restoring cell size, and it is often triggered when the size of a cell is less than a critical level (usually smaller than half of the original size for most species). The process of sexual reproduction is different for centric and pennate diatoms. Sexual reproduction is oogamous in centric diatoms.