ECTOCARPUS LIFE CYCLE PDF

The life cycle of an organism is one of its most elemental features, underpinning a broad range of phenomena including developmental processes, reproductive fitness, mode of dispersal and adaptation to the local environment. Life cycle modification may have played an important role during the evolution of several eukaryotic groups, including the terrestrial plants. Brown algae are potentially interesting models to study life cycle evolution because this group exhibits a broad range of different life cycles. Currently, life cycle studies are focused on the emerging brown algal model Ectocarpus. Two life cycle mutants have been described in this species, both of which cause the sporophyte generation to exhibit gametophyte characteristics. The ouroboros mutation is particularly interesting because it induces complete conversion of the sporophyte generation into a functional, gamete-producing gametophyte, a class of mutation that has not been described so far in other systems.

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Culture experiments and cytological studies were carried out under well-defined conditions. The haploid chromosome number is between 18 and There are two morphological types of plants: the well-branched gametophyte resembling the plants found in nature, and the unbranched sporophytic form which may be haploid or diploid, found only in cultures.

Meiosis takes place in the unilocular sporangia on diploid sporophytes. Haploid sporophytes form unilocular sporangia without reduction of the chromosome number. The spores from unilocular sporangia both on diploid and haploid sporophytes give rise to plants with either sporophytic or gamethophytic growth.

The gametophytes are homothallic, the gametes forming motile zygotes with four flagella. Parthenogenetic development of gametes exclusively results in the formation of haploid sporophytes. Both the haploid and diploid sporophytes can propagate by means of zoids from plurilocular sporangia.

Several observations reported here disagree with the findings of other workers. This site needs JavaScript to work properly.

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Similar articles [Culture experiments on life cycle, nuclear phases, and sexuality of the brown alga Ectocarpus siliculosus]. PMID: German. Evolution and maintenance of haploid-diploid life cycles in natural populations: The case of the marine brown alga Ectocarpus.

Couceiro L, et al. Epub Jul PMID: Role of endoreduplication and apomeiosis during parthenogenetic reproduction in the model brown alga Ectocarpus.

Bothwell JH, et al. New Phytol. Epub Jul 2. The resurgence of haploids in higher plants. Forster BP, et al. Trends Plant Sci. PMID: Review. Living together and living apart: the sexual lives of bryophytes. Haig D. Show more similar articles See all similar articles.

Cited by 2 articles [Culture experiments on life cycle, nuclear phases, and sexuality of the brown alga Ectocarpus siliculosus]. Uncovering the genetic basis for early isogamete differentiation: a case study of Ectocarpus siliculosus.

Lipinska AP, et al. BMC Genomics. References Nature. Publication types English Abstract Actions. Copy Download.

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Genetic regulation of life cycle transitions in the brown alga Ectocarpus

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. A Nature Research Journal. DURING an attempt to grow sexual plants of Ectocarpus siliculosus in laboratory cultures, some observations were made which are not consistent with the present-day view of the life-cycle of this species. Napoli , 33 ,

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[Studies on the Life Cycle of the Brown Alga Ectocarpus Siliculosus From Naples, Italy]

Ectocarpus is a brown alga. It is abundantly found throughout the world in cold waters. A few species occur in fresh waters. The plant grows attached to rocks and stones along coasts. Some species are epiphytes on other algae like members of Fucales and Laminaria. Genetically the thallus may be haploid or diploid. But both the types are morphologically alike.

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Structure and life cycle of ectocarpus

Culture experiments and cytological studies were carried out under well-defined conditions. The haploid chromosome number is between 18 and There are two morphological types of plants: the well-branched gametophyte resembling the plants found in nature, and the unbranched sporophytic form which may be haploid or diploid, found only in cultures. Meiosis takes place in the unilocular sporangia on diploid sporophytes. Haploid sporophytes form unilocular sporangia without reduction of the chromosome number. The spores from unilocular sporangia both on diploid and haploid sporophytes give rise to plants with either sporophytic or gamethophytic growth. The gametophytes are homothallic, the gametes forming motile zygotes with four flagella.

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Ectocarpus

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