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Life cycle of Ectocarpus siliculosus. Both Ectocarpus sexual and asexual life cycles are displayed. Gametes (right side) released from WT male gametophytes . The life history of Ectocarpus fasciculatus var. refractus (Kiitz.) Ardis. from Roscoff , France, has been studied in culture. This species proved to be the sporophytic. the sexual pheromones and infection of Ectocarpus by viruses. A proposition to (the life cycle can be completed in three months) and the ease with which.

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Ectocarpus – Wikipedia

These gametes are morphologically identical but one is less active, becomes passive after a short period and behaves as female gamete. The zoospores germinate within hours to produce a new Ectocarpus plant which is similar to sporophytic plant in structure Fig. The filaments can only be differentiated from each other through cytological studies llife the nature ectocarpis reproductive structure a particular filament bears. The gametes are biflagellate, motile and are produced in plurilocular gametangia borne on haploid or unisexual plants.

Quick Notes on Ectocarpus (With Diagram) | Algae

These gametes are morphologically identical but one is less active, becomes passive after a short period and behaves as female gamete.

The single nucleus of the young unilocular sporangium divides and redivides producing 64 nuclei. The protoplast of each diploid uninucleate cell of the sporangium is transformed into a single biflagellate zoospore Ectoczrpus.


Each protoplast then metamorphoses into a pear-shaped zoospore. Each zoospore wctocarpus pyriform, uninucleate with two laterally inserted unequal flagella. The erect system shows intercalary, diffuse or trichothallic growth, whereas it is apical in prostrate system. Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top.

So, each small cubical cells of plurilocular sporangium ectocaepus single diploid nucleus. This multicellular structure is called plurilocular sporangium.

Quick Notes on Ectocarpus (With Diagram) | Algae

According to KnightSchussing and Kothbaouerrarely the zoospores released from unilocular sporangia, show etocarpus and fusion but the fate of such zygotes is not known. The zoospores remain motile for hours and then germinate into diploid thallus which later on bears unilocular and plurilocular sporangia.

Ectocarpus wctocarpus very common on sea shore of Atlantic Ocean. With the completion of the nuclear division there is a cleavage into uninucleate protoplasts. These zoospores are haploid, they withdraw flagella and attach to the substratum by their anterior ends.

The erect system develops from the prostrate system which remains free-floating. The ultimate branch-lets of the erect portion are generally attenuated to an acute point Fig.

ectocarppus The cell contains a few parietal band shaped chromatophores with irregular branches E. It is known as clump formation. The sexual thalli of Ectocarpus are haploid.


On germination it develops into a sporophytic 2n plant. Growth of the prostrate system is apical, but that of erect threads shows considerable diversity.

The plurilocular gametangia are either sessile or stalked and vary in shape from ovate to siliquose. During warmer part of the year haploid filaments producing gametangia and gametes are developed.

The medium sized meso-gametangia give rise to medium size gametes. Many transverse and vertical divisions result in formation of cubical ectodarpus arranged in transverse tiers Fig.

Plant Body of Ectocarpus 3. Here’s how it works: The former produce diploid zoospores and the latter produce haploid zoospores. The mature zoospores are liberated from the sporangium ectocafpus apical or lateral pores. In this article we cyfle discuss about the life cycle of ectocarpus, explained with the help of suitable diagrams. Here’s how it works: The zoospores of plurilocular and unilocular sporangia are identical in structure but zoospores of plurilocular sporangia are diploid and zoospores of unilocular sporangia are haploid.