E. siliculosus produces unilocular sporangia at 13°C, plurilocular at 19°C and both unilocular and plurilocular at 16°C. This is one of the best-known brown algae containing many species. They found diploid plants bearing both unilocular and plurilocular reproductive structures having a reduction division in the former and none in the latter. Each mature plurilocular sporangium consists of vertical rows of many small cubical cells or compartments. Welcome to BiologyDiscussion! Zoospores are produced in these sporangia. Name the types of nitrogenous bases present in the RNA. The type species for the genus is Ectocarpus siliculosus Lyngbye. The gametes are biflagellate, motile and are produced in plurilocular gametangia borne on haploid or unisexual plants. Besides this, the nature and development of swarmer’s in Ectocarpus possibly throw light on the origin of sex in algae. What is its function? Like unilocular sporangia, the plurilocular sporangia also develop from the terminal cells of the branchlets of diploid sporophytic plant. a) Sporophyte: The sporophyte is diploid. After sometime one male gamete fuses egg to make zygospore and other gametes detach themselves from female gamete. Content Guidelines 2. Both sporangia and gametangia are occasionally found on the same plant. 2 B, C). Life Cycle of Ectocarpus (With Diagram) | Algae. Disclaimer Copyright, Share Your Knowledge The first division of the nucleus is reductional and the rest being equational. Ectocarpus has a haploid–diploid life cycle, involving alternation between two multicellular generations, the sporophyte and the gametophyte. (With Methods)| Industrial Microbiology, How is Cheese Made Step by Step: Principles, Production and Process, Enzyme Production and Purification: Extraction & Separation Methods | Industrial Microbiology, Fermentation of Olives: Process, Control, Problems, Abnormalities and Developments, The best answers are voted up and rise to the top. Reproductive Structures of Ectocarpus Algae. The protoplast of each cubical cell in gametangium metamorphosis into single biflagellate pyriform gamete. Life Cycle of Ectocarpus (With Diagram) | Phaeophyta. 3D-F). Whereas, the diploid zoospores serve to multiply the diploid individuals—the sporophytes. 2F-I). Life Cycle of Ectocarpus: The sexual thalli of Ectocarpus are haploid. Where are the pollen grains formed in the flower? The mature zoospores are liberated from the sporangium through apical or lateral pores. The filaments can only be differentiated from each other through cytological studies and the nature of reproductive structure a particular filament bears. No reduction division takes place during zoospore formation, hence all the zoospores are diploid. The zygospore germinates after 2-3 days. In E. padinae three distinct types of plurilocular gametangia are formed. The sexual thalli of Ectocarpus are haploid. The plurilocular gametangia develop singly from the terminal cell of the lateral branchlets. The fertilization occurs between gametes from separate plants. It has been thoroughly investigated in Ectocarpus siliculosus that environmental conditions, probably temperature commonly inhibit the development of one of the two generations. The isogametes or anisogametes fuse to form diploid zygospore. The haploid zoospores produce the haploid individuals—the gametophytes. 4B). Knight, Kylin and others working on Ectocarpus sili­culosus got some interesting results. Both Ectocarpus sexual and asexual life cycles are displayed. 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. The sporophytic diploid plant forms two types of sporangia: These two types of zoosporangia may be produced on the same plant or on different plants. 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. Represent antheridia Fig is Bread Made Step by Step ( the life Cycle Ectocarpus. Wall ( Fig simplest features in the unilocular sporangia develop singly on tips of small branchlets are. System ( Fig a new Ectocarpus plant which is similar to sporophytic plant essentially alike in appearance divides by division... 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