How do Ectocarpus reproduce?
Sexual reproduction in Ectocarpus takes place by isogamy or anisogamy. Ectocarpus secundus is heterothallic and anisogamous. The gametes are produced in plurilocular gametangia. These gametangia are many-celled, elongated, and sessile or shortly stalked conical structures.
What kind of alternation of generation is present in Ectocarpus?
Like many brown algae, Ectocarpus has a haploid–diploid life cycle that involves alternation between two multicellular generations, the sporophyte and the gametophyte (Fig.
What is the classification of Ectocarpus?
Brown algae
Ectocarpus/Class
Is Ectocarpus simple branched?
It is a marine brown alga, distributed throughout the temperate and tropical seas of the world. 2. Plant body is filamentous, much branched and heterotrichous, having basal rhizoids and well-developed branched erect system.
How does clump formation occur in Ectocarpus?
The active male gametes cluster around female gamete and cling themselves by their anterior flagellum. It is known as clump formation. The gametes fuse to form a diploid zygote. In other species of Ectocarpus gametes from same plant can fuse to form a zygote showing isogamous reproduction.
How do Chlamydomonas species produce zoospores?
The parent cell loses flagella or in some species of Chlamydomonas flagella are absorbed. Each daughter cell develops cell wall, flagella and transforms into zoospore (Fig. 6). The zoospores are liberated from the parent cell or zoosporangium by gelatinization or rupture of the cell wall.
How does Chara reproduce?
Chara reproduces vegetatively and sexually. Vegetative reproduction takes place by tubers, amylum stars and secondary protonemata. The sex organs are a multicellular and jacketed globule or antheridium (male) and nucule or archegonium (female).
Which components are present in the cell wall of Ectocarpus?
Ectocarpus is a filamentous brown alga, which cell wall is composed mainly of alginates and fucans (80%), two non-crystalline polysaccharide classes. Alginates are linear chains of epimers of 1,4-linked uronic acids, β-D-mannuronic acid (M) and α-L-guluronic acid (G).
Which type of Zoospores are seen in Ectocarpus algae?
The zoospores are biflagellate having one whiplash and other tinsel-type of flagellum. The diploid plant (2n) develops two types of sporangia.
What is the meaning of Ectocarpus?
Definition of Ectocarpus : the type genus of Ectocarpaceae containing numerous more or less branched filamentous brown algae that are especially abundant in cold seas and are sometimes considered the most primitive of living brown algae.
Is Ectocarpus unicellular or multicellular?
Ectocarpus is a genus of small, filamentous, multicellular, marine brown algae within the order Ectocarpales. Brown algae belong to the stramenopiles (or Heterokonta) (Fig. 1a), a large eukaryotic supergroup that is only distantly related to animals, plants and fungi.
How does sexual reproduction take place in Ectocarpus?
Sexual reproduction takes place by isogamy or anisogamy. Majority of the species are isogamous and homothallic. Some species are anisogamous. Ectocarpus secundus is heterothallic and anisogamous. The gametes are produced in plurilocular gametangia.
How tall does an Ectocarpus siliculosus filament grow?
E. siliculosus is a tufted plant, often only one to a few cm tall, but in exceptional cases up to 20 cm. It has axes that are freely branched, and the main axis is not distinguishable. Filaments on E. siliculosus can grow up to 30μm in diameter, tapering toward the apices and sometimes forming terminal pseudo hairs.
How does the life cycle of an Ectocarpus work?
In the life cycle of an Ectocarpus, there is an alternation of a distinct haploid generation of sexual plants bearing male and female gametes respectively and a generation of diploid asexual plant producing the zoospores. Sometimes the gametes may develop parthenospores which give rise to new gametophytes.
What kind of structure does Ectocarpus Secundus have?
Some species are anisogamous. Ectocarpus secundus is heterothallic and anisogamous. The gametes are produced in plurilocular gametangia. These gametangia are many-celled, elongated, and sessile or shortly stalked con i :al structures. These gametangia are produced on the haploid plants developing from the meiozoospores.