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 sporangial initial becomes enlarged and undergoes repeated mitotic division, thus cells are formed.

Quick Notes on Ectocarpus (With Diagram) | Algae

With the completion of the nuclear division there is a cleavage into uninucleate protoplasts. Anybody can ask lifs question Anybody can answer The best answers are voted up and rise to the top. They named the plurilocular reproductive structures as neutral sporangia.

Answer Now and help others. Like unilocular sporangia, the plurilocular sporangia also develop from the terminal cells of the branchlets of diploid sporophytic plant.

This results in formation of haploid nuclei Fig. The gametangial initial cydle transversely to form a row of cells.

The diploid plants bear both unilocular and plurilocular sporangia. In most species the erect threads exhibit diffuse growth. The formation of unilocular and plurilocular sporangia is affected by environmental conditions like temperature and salinity of water. The unilocular sporangia develop haploid zoospores i. In isogamous species the fusing gametes are morphologically and physiologically similar.


Life Cycle of Ectocarpus (With Diagram) | Phaeophyta

A large number of male gametes are attracted and cluster around female gamete to make clump formation Fig. Hence the reproduction is isogamous but physiologically anisogamous.

This is one of the best-known brown algae containing many species. Each zoospore is pyriform, uninucleate with two laterally inserted unequal flagella. They remain motile for about 30 minutes. Occurrence, Features and Reproduction.

The zoospores of plurilocular and unilocular sporangia are identical in structure but zoospores of plurilocular sporangia are diploid ecgocarpus zoospores of unilocular sporangia are haploid. The zoospores after being discharged remain in spherical mass at the apex of sporangium.

These diploid zoospores multiply only sporophytic plants and they do not play any role in alternation of generation. These are unilocular sporangia and pleurilocular or neutral sporangia Fig.

This is how the life cycle is completed Fig. The cell wall is differentiated into two layers, the inner firm layer is made of cellulose and the outer gelatinous layer contains alginic acid. Most of the Ectocarpus species are anisogamous. The cells are arranged in regular rows. In this article we will discuss about the life cycle of evtocarpus, explained etcocarpus the help of suitable diagrams. They may be ribbon-shaped, band-shaped, discoid etc.

The protoplast of each cubical cell in gametangium metamorphosis into single biflagellate pyriform gamete. The gametes are biflagellate, motile and are produced in plurilocular gametangia borne on haploid or unisexual plants.

Ectocarpus – Wikipedia

It is known as clump formation. Further divisions are transverse and vertical in these cells to make hundreds of cubical cells arranged in transverse layers.

Growth of the prostrate system is apical, but that of erect threads shows considerable diversity. The gametes are liberated in water through terminal or lateral pore in gametangium. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes.


They are large, elongated, sessile or short stalked, multicellular structures Fig. This cell functions as sporangial initial Fig. Occurrence of Ectocarpus 2. On the other hand, unilocular sporangium produces zoomeiospore through meiosis, followed by several mitotic divisions.

They are the eectocarpus primitive of all the members of the class Phaeophyceae. Many transverse and vertical divisions result in formation of cubical cells arranged in transverse tiers Fig.

The growth is apical in E. The diploid nucleus of zygospore divides mitotically during germination.

Life Cycle of Ectocarpus (With Diagram) | Phaeophyta

The cell which functions as sporangial initial Fig. It is a marine alga of world-wide distribution being abundant particularly along the Atlantic Coast but rather scarce along the Pacific Coast. In this clump formation Fig. The erect system shows intercalary, diffuse or trichothallic growth, whereas it is apical in prostrate system. They germinate to produce new diploid sporophytic plant. The former produce diploid zoospores and the latter produce haploid zoospores.

These zoospores are haploid, they withdraw flagella and attach to the substratum by their anterior ends.