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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Answer Now and help others. The zoospores remain inactive for seconds then become free and swim in water. The protoplast of each cubical cell llfe gametangium metamorphosis into single biflagellate pyriform gamete. The prostrate system serves the function of anchorage with the substratum or on other plants and the erect system is photosynthetic and bears reproductive organs. The cells are arranged in regular rows.

Quick Notes on Ectocarpus (With Diagram) | Algae

In this article we will discuss about: The nuclear divisions are not followed by wall formation and the sporangium remains unilocular Fig. The asexual reproduction takes places with the help of biflagellate zoospores.

In most species the erect threads exhibit diffuse growth. The more active gametes are considered male. Galls are formed in Laminaria and Cystoseria due to the presence of E. The physodes contain polyphenols, probably function as lysosomes. This forms diploid, sporophylic plants. The protoplast of each compartment is metamorphosed into a single etocarpus zoospore. The diploid nucleus of zygospore divides mitotically during germination. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes.


The zoospores of plurilocular sporangia liberate through apical Fig. Both the main axis and branches are uniseriate monosi- phohousbut the lower part may become multiseriate polysiphonous clue to longitudinal division e. The active male ectocaepus cluster around female gamete and cling themselves by their anterior flagellum.

Plants are usually attached to other submerged plants, sometimes to stones or similar other objects. This results in formation of haploid nuclei Fig. In Ectocarpus the sporophytic and gametophytic plants are morphologically similar hence there is isomorphic alternation ccycle generation Figs.

Reproductive Structures of Ectocarpus Algae. Ectocarpus is found attached on sea rocks. Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top.

The cells then undergo several vertical divisions thus a multi- chambered structure is formed i. The mature zoospores are liberated from the sporangium through apical or lateral pores.

Life Cycle of Ectocarpus (With Diagram) | Phaeophyta

They do not fuse but develop new plant parthenogenetically. Some species of Ectocarpus are epiphytic e.

In many species of Ectocarpus, the thallus is sparingly to profusely branched, the cells are uniseriate, joined end to end in a ccycle. Reproductive Structures of Ectocarpus Algae. The reserve food material is in form of laminarin and mannitol. On the other hand, unilocular sporangium produces zoomeiospore through meiosis, followed by several mitotic divisions.

Discovery, Classification and Structure. These gametes are morphologically identical but one is less active, becomes passive after a short period and behaves as female gamete. The smaller gametes are produced in micro-gametangia and the larger are produced in bigger mega-gametangia. Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top.


According to KnightSchussing and Kothbaouerrarely the zoospores released from unilocular sporangia, show pairing and fusion but the fate of such zygotes is not known. These diploid zoospores multiply only sporophytic plants and they do not play any role in alternation of generation.

Some species like E. Its diploid nucleus divides mitotically to make diploid Ectocarpus plant. In India they are commonly found in the western coast. Many transverse and vertical divisions result in formation of cubical cells arranged in transverse tiers Fig. Though both are morphologically more or less alike, the gametes are slightly smaller in size than the zoospores.

Occurrence of Ectocarpus 3. This type of life cycle has etocarpus great resemblance with the life cycle of the green alga Ulva.

Ectocarpus: Occurrence, Features and Reproduction

Further divisions are transverse and vertical in these cells to make hundreds of cubical cells arranged in transverse layers. The plurilocular gametangia are either sessile or stalked and vary in shape from ovate to siliquose.

The erect system shows intercalary, diffuse or trichothallic growth, whereas it is apical in prostrate system. In physiologically anisogamous species, gametes from two filaments of different strains fuse. The formation of unilocular and plurilocular sporangia is affected by environmental conditions like temperature and salinity of water.