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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This forms diploid, sporophylic plants.

Life Cycle of Ectocarpus (With Diagram) | Phaeophyta

The protoplast of each cubical cell in gametangium metamorphosis into single biflagellate pyriform gamete. It takes place by zoospores. It is a marine alga of world-wide distribution being abundant kife along the Atlantic Coast but rather scarce along the Pacific Coast. The fucoxanthin masks the chlorophyll and gives the characteristic brown colouration.

Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top. In India they are commonly found in the western coast. Both haploid and diploid plants are morphogically identical Fig. The zoospores discharge en-masse in gelatinous matrix through a terminal pore in sporangium. The diploid yccle of zygospore divides mitotically during germination.

With the completion of the nuclear division there is a cleavage into uninucleate protoplasts. Reproductive Structures of Ectocarpus Algae. This multicellular structure is called plurilocular sporangium.


Ectocarpus: Occurrence, Features and Reproduction

In other species of Ectocarpus gametes from same plant can fuse to form a zygote showing isogamous reproduction. This cell functions as sporangial initial Fig. The zoospores of plurilocular sporangia liberate through apical Fig. Both sporangia and gametangia are occasionally found on the same plant. Zoospores from unilocular sporangia develop into gametophytes Fig. Each unit then metamorphoses into a single, uninucleate 2n and biflagellate zoospore. ectoczrpus

Each nucleus of the sporganiuin gets surrounded by protoplast segment and ultimately transforms into zoospores Fig. The mature zoospores are liberated from the sporangium through apical or lateral ectocarpis. The female gamete after liberation secretes a volatile sexual attractant sirenine. Hence the reproduction is isogamous but physiologically anisogamous.

Life Cycle of Ectocarpus (With Diagram) | Phaeophyta

These two types of zoosporangia may be produced on the same plant or on different plants. It is known as clump formation. The zoospores formed in unilocular sporangia are haploid and on germination form haploid gametophytic thalli. The egg and antherozoids produced by the mature mega-gametangia and micro-gametangia fuse to form zygospore. The formation of unilocular and plurilocular sporangia is affected by environmental evtocarpus like temperature and salinity of water. The gametes are biflagellate, motile and are produced in plurilocular gametangia borne on haploid or unisexual plants.

The cells are arranged in vertical row Fig. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. Two types of plant wctocarpus are differentiated genetically, one is haploid and other one is diploid. It is a marine brown alga, distributed throughout the temperate and tropical seas of the world.


The haploid plants bear plurilocular gametangia. The zoospores remain motile for hours and then germinate into diploid thallus which later on bears unilocular and plurilocular sporangia. The haploid plants bear plurilocular gametangia. They are the most primitive of all the members of the class Phaeophyceae. But some are less active and become passive after a short time. The number and shape of chromatophore varies with species.

The gametes are liberated in water through terminal or lateral pore in gametangium.

After sometime one male gamete fuses egg to make zygospore and other gametes detach themselves from female gamete. The zoospores germinate within hours to produce a new Ectocarpus plant which is similar to sporophytic plant in structure Fig. Each protoplast then metamorphoses into a pear-shaped zoospore. These plants are called gametophytic plants as on maturity llife bear plurilocular gametangia.