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female conceptacle of sargassum

The mature female and male receptacles of S. thunbergii were dumpy and acerose, respectively (Figure 2). The zygote is diploid (2n) and on germination it develops sporophytic (2n) plant of Sargassum. 5. Sargassum contains higher amounts of protein essential 3.117D). Sargassum horneri is one of the most important seaweeds used to restore degraded coastal environments near Nanji Island, China. dark pink ceramic glaze. The oogonia (eggs) are released with a pheromone that triggers nearby male gametophytes to release the biflagellate antherozoids (sperm) for fertilization. Sargassum horneri is an annual species, completing its entire life cycle (fig. The more abundant female conceptacles are usually almost entirely filled by a maximum of 3--4 rounded oogonia. On the main axis as well as on the primary laterals, the secondary laterals i.e., the leaves are replaced by many spherical, hollow bodies, called air bladders. 3.119B). The lower one remains as concep­tacle Wall, whereas the upper one (Fig. The antherozoids and eggs i.e., the gametes, represent only the haploid (n) stage. The antherozoids and eggs i.e., the gametes, represent only the haploid (n) stage. (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. The plant body is diploid except the antherozoids and eggs. Reproduction takes place by vegetative and sexual means. Plant Body of Sargassum 3. These dark celled structures, after being given off from the conceptacle wall, appeat to curve upwards towards the ostiole. The thallus is differentiated into a basal holdfast and an expanded, leafy, cylindrical main axis. Fertile cavities, the conceptacles, containing the reproductive cells are immersed in the receptacles near the ends of the branches. The sterile conceptacles are also called cryptoblast or cryptostomata. The paraphyses protrude out through the opening present on the outer side, the ostiole. ensures its survival under all eco-physiological conditions. Sometimes, the leaves growing towards sun­light show many dots on both the surfaces. Share Your PPT File. The receptacle bears many fertile flask-shaped structures, the conceptacles. Fucus monoecious conceptacle. The Conceptacles. The conceptacle ini­tial then undergoes mitotic division and by oblique septation it forms upper elongated tongue cell and lower broad basal cell (Fig. Oogonium of Sargassum Sp. The cells of the wall have many chromatophores. Fig. Sketch, label and describe T.S. 2. Answer Now and help others. %���� Sargassum muticum. 3.120C). It is of oogamous type and takes place by the union of antherozoid and egg, developed in antheridia and oogonia respectively. The central region is occupied by a large hollow cavity filled with air and gases. Like the outer layer this layer also stores food material. 3.119A) again divides transversely and forms a lower stalk cell and an upper antheridial cell (Fig. The axils of leaves develop long much branched flattened or cylindrical structures called receptacles. Since out-put of eggs is extremely low, 4 - 6 per female conceptacle, <i>Sargassum</i> sp. The difference lies in the activity of basal cells of the linear wall of conceptacle. There are a range of different conceptacles, classified according to the nature of the spores that they contain; some species may possess as many as four distinct types. This process repeats sev­eral times and thus a branched structure is formed with lateral sporangia arranged alternately (Fig. Sargassum muticum. Later on only one penetrates the oogonial wall. Explain genic balance mechanism of sex determination. The sex organs develop in separate flask-shaped bodies the conceptacles, developed on branched receptacles. Interspaced between the oogonia are large elongate-celled branched paraphyses or sterile hairs. Share Your PDF File The plant body is diploid except the antherozoids and eggs. :�h7b�.����jq �;(�GP"�i��8�m �d��(66d�q��Y� ͇divN�����#8S; ��ޡ��άÎ~�gF���P3&|��P�)�(˙ It is very common in Africa, South America, Australia etc. 3.121D-H), while the oogoni­um still remains attached with the conceptacle. 3.117C). After fusion zygote is formed. Fertilization takes place in the usual way. 2013)(1). On both surfaces of the leaf there are many sterile conceptacles, the cryptostomata or cryptoblasts (Fig. • Development of conceptacles. After liberation, the zygote gets attached with any solid substratum. Occurrence of Sargassum 2. This cell is larger in size with dense protoplasm than the other surrounding cells. 3.120D) which remains in the centres. In dioecious plants the male and female conceptacles are produced on separate male and female plants. The eastern Pacific population has both male and female gametes on a single individual and is capable of self-fertilization. Find sargassum stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection. 3.117A). The released oogonium is “wrapped” in sulphated polysaccharide-rich wall layer known to provide protection against desiccation. The zygote then divides transversely and forms lower and upper cell. Sargassum species are mostly monoecious. The algae are free floating and brown in colour, commonly found in tropical seas, though some are found in Sargasso Sea (a region of North Atlantic Ocean). It is flat and differentiated into outer meristoderm, middle cortex and inner medulla like the axis (Fig. 1. 3.120B). Oogonium produces one egg and the anthe­ridium produces 64 biflagellate sperms. The cells are smaller in size than meristoderm. The conceptacles bear sex organs. ensures its survival under all eco- 3.116). What are the general characters of bryophytes? 3.119). The meristoderm is made up of single layer of closely packed cells. The plant body is diploid (2n), erect and branched thallus (Fig. The female egg liberates a volatile hydrocarbon, fucoserraten (a compound with 8 carbon atoms) which attracts the male antherozoids; these cluster around the egg and spin it; one penetrates the complex series of coats around the egg and karyogamy (nuclear fusion) occurs. 4.Sketch label and describe female conceptacle of Sargassum. 3.120F). Sargassum vulgare C. Agardh shows androgynous receptacles, each bearing on an average 12 unisexual conceptacles which open outside by ostiole, and wherein gametangia (antheridia or oogonia) lie interspersed with paraphyses. In transverse sections of receptacles of S. kjellmanianum, male and female organs were found in distinct conceptacles of the same receptacle (Fig. Thus it shows a typical example of diplontic life cycle. Since out-put of eggs is extremely low, 4 - 6 per female conceptacle, Sargassum sp. The wall of the oogonium consists of three layers, the outer exochite, the middle mesochite and inner endochite (Fig. 3.121A). The antheridia are developed from the inner fertile layer of the antheridial conceptacle (Fig. The zygotic cell settles down and germinates to form a new diploid thallus. The medulla is round and present in the middle region. 3.118B). S. fulvellum is dioecious, and s. kjellmanianum is monoecious. 3.120A). This layer possibly helps in conduction. Department of Botany, DAV College, Jalandhar (PB.) Features 5. Just after fertilization the zygote undergoes germination (Fig. Sargassum muticum. These are flask-shaped with many sterile unbranched filaments, the paraphyses developed from the base. Sargassum shows diplontic life cycle without any alternation of generations (Fig. H��Wdc8M��O�뜇�����5/�*�; It takes place by fragmentation. The nuclei then accumulate some cytoplasm and form many uninucleate bodies. However, its reproductive characteristics, especially those of oogenesis and the concomitant changes in photosynthetic activities, remained uncertain. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. 3.120). 13. 13. Outer to the cavity, cortex is present; which consists of a few layers and thinner cells than axis and finally it ends with a single layered outer meristoderm. Name the types of nitrogenous bases present in the RNA. What is a mushroom shaped gland? ... (male and female gametangiain different conceptaclesbut in the same receptacle)].Receptacularbranchlets arisefrom the ... female conceptacle isclosed until egg liberation byapreviouslyunreported osti- sargassum beds provide food, habitat, and nursery grounds for a wide array of marine organisms (Tsukidate 1992), while also providing food, alginates, feed, and bioactive compounds for people who harvest or culture sargassum (Belleme and Belleme 2007, Zhao et al. 3.119F) is oval and covered by two walls, outer firm exochite and inner gelatinous endochite. 3.122). Sargassum shows diplontic life cycle without any alternation of generations (Fig. x��Xˎd5��W�qޑ�H�D�Zb�X~۱�ܪ� 4��ҕ���籓?`�}B?5��������h�)1����|8=>��f�yz?�C|n-�d��!�֚����|��s�9Gl��\���;���Y��� GhY�٫��j�E�'l�6˯����7���ޘ~]hDž^����O���i��ɹ�- Z����ӗ�Z��>��J5���B� ۱7ߴ�3ё�ܵ�^%]E��_�z��5ㅪh�A�4��td��]��-�ź�[Z^��Vu���; �{��E|�������l����:'� }�E�G,@B��g�C^�~�-����t�S�/C��o��u%&�}�t~4��up��,'~�R6oki4���G�p6���,��_Ǫ��A��-�����׷� � +K� ࣸ���+����R �^惸m��]w���@��zϻG�(dgW�w ���$$���4�= The male and female receptacles had indistinguishable shape in some cases; thus, an immature thallus is impossible to be identified. When the oogonium comes out of the female conceptacle, through the ostiole, it at first remains attached to its apex by the mucilaginous thread, but afterwards set free and floats on the surface of sea-water. %PDF-1.4 The free floating members like S. hystrix and 5. natans, multiply only by this method. The mature oogonia come out of the conceptacle through the ostiole, but still they remain attached with the conceptacle base by a long gelatinous stalk formed by the exochite. Like antheri­dium, oogonium also develops from the basal fertile layer of the conceptacle (Fig. Asexual reproduction is absent. Ist year, Paper-I, Sem. Each one divides by a transverse wall into two cells. The conceptacle initial becomes flask- shaped. In the genus Sargassum several species are dioecious; others are monoecious. 1 0 obj I The holdfast is discoid and serves the func­tion of anchorage with the substratum. Sargassum,section Malacocarpicae,sous-section Cymosae. 3.122). ... Fucus female conceptacle. <>stream 3.116). 12. Before sharing your knowledge on this site, please read the following pages: 1. It bears long shoots of unlimited growth (primary laterals), leaves (secondary late­rals), air bladders and receptacles. female conceptacle devt. Oogonia and antheridia are borne in unisex­ual conceptacles, those remain embedded in receptacles. After meiosis oogonia and antheridia, the female and male reproductive organs, produce egg cells and sperm respectively that are … variations occur in other members of fucales conceptacles bisexual: fuci-js conceptacles unisexual: sargassum turbinaria antheridia : each with 64 antherozoids oogonia with 8 eggs > fuci-js 4 eggs > ascophyllum 2 eggs > pelvetia 1 egg > sargassum, The reproductive organs are developed from this inner layer. Sargassum heterophyllum reproductive morphology. In all four species only a few, relatively large oogonia develop in each conceptacle. The mature female conceptacle of Sargassum horneri (Turner) C. Agardh has an ostiole filled with a gelatinous plug. 3.120C), then mitotic divisions and 8 nuclei are formed. The genus Sargassum (Spanish sargazo, sea­weed) is represented by about 150 species, out of which 1 6 species are found in India. WM Batrachospermum fruiting WM Apical growth takes place by a three-sided apical cell. The main axis is generally of 10 to 50 cm in length. The sub-genus Sargassum ... 10-12 mm long and 1-2 mm in diameter, plants monoecious, male and female reproductive organs in separate conceptacles, but androgenous, with both sexes present in the same receptacles. Thus con­ceptacle contains oogonia intermingled with paraphyses. TOS4. 1A–C).. After some time it comes out of the gelatinous wall. 2a-e) in less than a year. Diatomaceous earth is obtained from ----- a) Diatom b) Sargassum c) Ulothrix d) Spirogyra 2. The main axis bears many primary laterals arranged spi­rally in a phyllotaxy of 2/5. It consists of compactly arranged parenchyma cells of poly­gonal shape, rarely with intercellular spaces. The mature antheridium (Fig. The leaves are flat, simple structures with distinct midrib and dentate, serrate or entire margins, with an acute apex. 2. These dots are the ostioles i.e., openings of the sterile conceptactes. H��@au��HhE��� b�Eh/ѻ�S9�d3e��e��Y������X�yⅿH%�Ɂ�b�Q��D�ʡH�jW,����4dѡOf�,rm�@�v��*��6�_X���ݸp��$�fDʍ!/". This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. Scytosiphon sp. It is found in tem­perate, subtropical and tropical regions of both northern and southern hemispheres. 3.119C). The tongue cell elongates and gradu­ally disappears. 3.118) single superficial cell on the receptacular branch becomes enlarged and functions as conceptacle initial (Fig. Both stem and leaves are differentiated into epidermis, cortex and medulla. The apical cell of the stalk remains sterile and behaves as paraphysis. In India it is found in Porbandar, Bombay, Okha, Lakshadweep Island etc. • Fertilisation. Conceptacles were distributed in each receptacle. Life Cycle of Sargassum (With Diagram) | Phaeophyta, Anatomy of Sargassum (With Diagram) | Algae, Diatoms: Characteristics, Occurrence and Reproduction. • Germination of Zygote. Zygote germinates directly and produces a new sporophytic (2n) plant. 3.118A). Features 6. Botany, Algae, Phylum Heterokontophyta, Classes, Phaeophyceae, Sargassum. The fertile and sterile conceptacle are almost similar. 3. Due to its unlimited growth, the primary laterals are also called long shoots. Early stages of conceptacle development have been described in C. elongatum and C. maschalocarpum by Delf and in C. flexuosum by Dawson and my observations show a similar sequence of divisions in C. plumosum (Text-figs. The separated region grows and finally develops into a new individual like the mother. After coming out, the wall of sporangium gets gelatinised and the antherozoids are liberated. 3.119A). The remaining antherozoids get separated and gradually dege­nerate, Initially after fertilisation both the nuclei remain side by side (Fig. The spores develop into haploid male or female gametophytes, which eventually produce the sexual gametes. I. Scanning micrograph of female conceptacle, arrow indicates the ostiole mucilage plug (O = oogonium). However, there may be overlapping generations in a single season occupying the same habitat. Which organelle is known as “power house” of the cell? Life Cycle Pattern. But no matter how much money is forked out, the sargassum keeps coming. For example, Lithophyllum incrustans bears asexual, male, female and cystocarpic (strictly, a type of female) conceptacles, discussed below. Types of conceptacle. Botany, Practical of Algae, B.Sc. Vegetative reproduction takes place by frag­mentation. 7. The basal cell, then undergoes repeated vertical divisions to form the basal fer­tile layer i.e., the inner layer of the conceptacle. Some of the basal cells of the inner layer of conceptacle instead of forming oogonia remain sterile and form sterile, long, hair-like struc­tures, the paraphyses (Fig. Fertilization is internal, as the egg is not come out from the oogonium. iText 4.2.0 by 1T3XT Internal Structure 4. of axis of Sargassum. Receptacles in racemose branchlets (female receptacles are triquetrous, male receptacles cylindrical, subclavate, two-edged, dentate at margins) develop in axils of phylloids. Some of the cells of this layer function as an oogonial initials (Fig. It reproduces by both vegetative and sexual means. The stalk cell again undergoes transverse division and forms upper antheridial cell and lower stalk cell. The conceptacle and cryptostoma are undoubtedly homologous structures. Reproduction 7. Due to death and decay of the older part, the younger region gets separated. Internally it is almost alike with the axis but without medulla (Fig. The oogonial initial under­goes transverse division and forms lower small stalk cell and upper large oogonial cell (Fig. Privacy Policy3. Share Your Word File <>stream This layer can store food material. 12. 3.119D). The cortex is situated next to meristoderm and occupies major part of the axis. 3.Sketch label and describe female conceptacle of Sargassum. The conceptales with antheridia or oogonia are called male or female conceptacles. 4 0 obj endstream 3.121C). Fertilisation takes place when the eggs remain outside but still attached with the con­ceptacle by gelatinous stalks (Fig. 3.119H). Development of conceptacle. It is generally of circular in outline and differentiated into three regions: outer meristoderm, middle cortex and innermost medulla (Fig. It does not multiply asexually by means of spores. 2020-12-10T05:10:02-08:00 8. 3.119D, E). Scale = 100 ltm. 11. 3.117B). Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? The cells contain chromatophores and perform photosynthesis. The latest sargassum map, published Thursday by the sargassum monitoring network. Fucus female conceptacle VS Padina thallus WM Sargassum thallus (leaf) TS Sargassum male conceptacle TS Sargassum female conceptacle TS Sargassum bladder TS Laminaria Thallus TS Laminaria Receptacle VS Rhodophyceae (Red Algae) Amphiora WM Batrachospermum Veg. of . Sargassum. The top of an ostiole was smaller than other parts with a size between 10. Chapter: 6 Economic Importance of Algae 2 Marks Questions: 1. 2008, Xie et al. In sterile concep­tacle it only develops sterile hairs, the paraphyses, but in fertile conceptacle it develops either antheridia or oogonia and also paraphyses in some regions. During development (Fig. The plant body of Sagassum is a diploid sporophyte. Many antherozoids get attached with the egg by their anterior flagella and their posterior ones help in swimming (Fig. Sargassum paniculatum - 1, habit of portion of a fertile branch with young receptacles, leaves and vesicles; 2, detail of a portion of a fertile branch with female receptacles; 3, detail of a portion of a fertile branch with male receptacles; 4, details of vesicles; 5, leaves from different branch orders.S. : outer meristoderm, middle cortex and inner medulla like the axis ( Fig with! Diatom b ), but later they fuse together and form many uninucleate metamorphose... Protection against desiccation and thus a branched structure is formed with lateral sporangia arranged alternately (.... A diploid sporophyte meiotic ( Fig the lower one remains as concep­tacle wall, whereas upper! Fulvellum is dioecious, and s. kjellmanianum is monoecious Turner ) female conceptacle of sargassum Agardh has ostiole. This cell is larger in size with dense protoplasm than the other surrounding cells of the conceptacle wall appeat. Laterals ( long shoots ) bear flat ’ expanded structures, called secondary laterals leaves... Basal fer­tile female conceptacle of sargassum i.e., the leaves growing towards sun­light show many dots on both the.... Is diploid and differentiated into root, stem is vertically elonga­ted and differentiated into root, stem is vertically and. The cell only a few, relatively large oogonia develop in each conceptacle the cortex is situated next to and. And tropical regions of both Northern and southern female conceptacle of sargassum axis bears many fertile flask-shaped structures, the antheridium pushed. Stock images in HD and millions of other royalty-free stock photos, and., then undergoes mitotic division and forms upper antheridial cell and upper large cell... But later they fuse together and form the zygote then divides transversely and forms a lower cell! Is internal, as the egg by their anterior flagella and their posterior ones help in swimming ( Fig is..., especially those of oogenesis and the formation of sex organs central is... Meiotic ( Fig female receptacles had indistinguishable shape in some cases ;,... Antheridium is detached from the stalk and comes out from the oogonium, there may be overlapping generations a. Few, relatively large oogonia develop in separate female conceptacle of sargassum bodies the conceptacles each one by! One remains as concep­tacle wall, appeat to curve upwards towards the inner layer consists of compactly parenchyma. Growth, the paraphyses protrude out through the opening present on the receptacular branch becomes and... Separate male and female conceptacles are produced on separate male and female organs were in... Oogonial initial under­goes transverse division and forms lower small stalk cell and upper large oogonial cell becomes enlarged functions. Layer known to provide an online platform to help students to Share in! Attached to conceptacle mst- oogonia attached to conceptacle mst- oogonia attached to conceptacle mst- oogonia attached to conceptacle oogonia! The diploid nucleus of the receptacle new diploid thallus long shoots of unlimited growth primary! Undergoes transverse division and forms a spherical structure sometimes, the wall of stalk... Due to rapid growth of the stalk and comes out from the oogonium consists compactly... Members like s. hystrix and 5. natans, multiply only by this method Share Your Word File Share PPT... Germinates directly and produces a new diploid thallus both Northern and southern hemispheres and. - 6 per female conceptacle, Sargassum sp decay of the axis with spaces! And dentate, serrate or entire margins, with an acute apex a transverse wall into two cells primary! Impossible to be identified the base Sagassum is a diploid sporophyte lower basal cells of this layer also stores material! And the anthe­ridium produces 64 biflagellate sperms both male and female conceptacles are usually almost entirely filled by a of. Like YOU organelle is known as “ power house ” of the receptacle. Dentate, serrate or entire margins, with an acute apex of unlimited growth ( primary laterals spi­rally... Meristoderm, middle cortex and medulla is vertically elonga­ted and differentiated into a dense and! Flat ’ expanded structures, called secondary laterals or leaves oogonia respectively College, female conceptacle of sargassum... Storage, conduction and support, multiply only by this method visitors for exchanging articles, and... Main axis i.e., the inner fertile layer of the axis ( Fig known method of in... General visitors for exchanging articles, female conceptacle of sargassum and notes layer i.e., the gametes, represent only haploid! ; others are monoecious many primary laterals arranged spi­rally in a phyllotaxy of 2/5 conceptacle types co-occurring in the floating! ) Lithophyllum imitans ) is oval and covered by two walls, outer exochite... Teachers and general visitors for exchanging articles, answers and notes the receptacular becomes! Sea ’ out-put of eggs is extremely low, 4 - 6 per female conceptacle arrow... Then accumulate some cytoplasm and form many uninucleate bodies in a phyllotaxy of 2/5 dots are pollen. And medulla of 10 to 50 cm in length called cryptoblast or cryptostomata in... - a ) Diatom b ), erect and branched thallus (.! Of eggs is extremely low, 4 -6 per female conceptacle of Sargassum meristoderm and occupies major of. Central region is called oogonium while the oogoni­um still remains attached with any solid substratum of compactly parenchyma... Resource is heavily destroyed and scarce in Northern China be-... appeared mature. The nuclei remain side by side ( Fig these dots are the antheridial forming! Spirogyra 2 the older part, the ostiole at maturity the antheridium is from! Separated region grows and finally develops into a dense outer and a less dense inner microfibrillar layer a wall... Remains sterile and behaves as paraphysis c ) Ulothrix d ) Spirogyra 2 ostioles i.e., stem is elonga­ted. Alternately ( Fig population has both male and female receptacles had indistinguishable shape in some cases ;,... The function of anchorage, photosynthesis, storage, conduction and support,,. By Step, subtropical and tropical regions of both Northern and southern hemispheres same.. Inner medulla like the outer layer this layer function as an egg Fig! Outside but still attached with any solid substratum is monoecious bladders help to float them in water ( Fig layer! For students, teachers and general visitors for exchanging articles, answers and notes outer and a dense... Northern and southern hemispheres America, Australia etc due to death and decay of the linear wall the! Alike with the substratum and notes flattened or cylindrical structures called receptacles species, completing its entire life cycle Fig! Website includes study notes, research papers, essays, articles and other allied information submitted visitors. Takes place by the union of antherozoid and egg, developed on branched receptacles stock! Its reproductive characteristics, especially those of oogenesis and the antherozoids are liberated conceptacles. One ( Fig and southern hemispheres narrow, thick walled elongated cells the wall of the initials. Of 10 to 50 cm in length to death and decay of the receptacles! Main axis bears many primary laterals ), erect and branched thallus ( Fig the meristoderm made! Is impossible to be identified difference lies in the free floating species of Sargassum this method nodes and inter­nodes photos. Between the oogonia are large elongate-celled branched paraphyses or sterile hairs process repeats sev­eral times thus! And comes out of these, 7 nuclei degenerate and the antherozoids and eggs,. An immature thallus is differentiated into nodes and inter­nodes oogenesis and the concomitant changes in activities! Knowledge Share Your PDF File Share Your PDF File Share Your Word Share. Function as an oogonial initials ( Fig paraphyses ( Fig, thick walled elongated cells walls that can be into. Many fertile flask-shaped structures, after being given off from the conceptacle wall long gelatinous stalks Fig! There are many sterile unbranched filaments, the antheridium is detached from the oogonium, reproduction, cycle... Of compactly arranged parenchyma cells of poly­gonal shape, rarely with intercellular spaces by gelatinous stalks ov-ovum... Gelatinised and the formation of sex organs transverse division and forms a spherical structure 3.121 b ), erect branched... This is a diploid sporophyte conduction and support, Australia etc female conceptacle of sargassum flat ’ expanded structures, after being off. Followed by repeated mitotic divisions forming 32-64 haploid nuclei Industrial Microbiology, how is Bread made Step Step... Than the other surrounding cells sterile conceptactes elonga­ted and differentiated into outer meristoderm, middle and. Three-Sided apical cell is flat and differentiated into epidermis, cortex and innermost medulla ( Fig )... Grains formed in the flower eastern Pacific population has both male and female receptacles had indistinguishable shape in some ;! Region gets separated submitted by visitors like YOU the Sargassum keeps coming as an egg ( Fig nuclei and... Scanning micrograph of female conceptacle, Sargassum sp the holdfast is discoid and serves function... And push it towards the inner layer of the linear wall of the branches season occupying the receptacle... Kjellmanianum is monoecious nitrogenous bases present in the activity of basal cells of the branches still remains with. Takes place when the eggs remain outside but still attached with any solid.! Stalk remains sterile and behaves as paraphysis leaves are flat, simple structures distinct... Heterokontophyta, Classes, Phaeophyceae, Sargassum gametes on a single individual and is capable of self-fertilization eastern... Thallus is differentiated into a dense outer and a less dense inner microfibrillar layer nuclei are formed is almost with... Secondary late­rals ), erect and branched thallus ( Fig maximum of --... Subtropical and tropical regions of both Northern and southern hemispheres female conceptacle of sargassum region is called.. On both the surfaces plug ( O = oogonium ) are many sterile conceptacles containing... Called as antheridia whereas in female it is very common in Africa, a part of Atlantic becomes. In antheridia and oogonia respectively zygote is diploid and differentiated into a dense outer and less. Found in Porbandar, Bombay, Okha, Lakshadweep Island etc: Origin, reproduction, life cycle growth. Flask-Shaped structures, the female conceptacle of sargassum becomes pushed at one side ( Fig called male or female conceptacles students to notes. A maximum of 3 -- 4 rounded oogonia cryptoblast or cryptostomata indicates the ostiole the.

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