The reproductive potential of the tetrasporangial phase of Gelidium robustum was studied for 16 months at two sites off Santa Barbara, California. Reproduction, if present, is oogamous, involving non-motile male spermatia; Mitosis is closed (the nuclear envelope does not break down) Telophase spindle is perisistant; Centrioles are lacking; a ring-shaped microtubular organizing center (MTOC) is present at the spindle poles during spindle formation A mat-forming, stoloniferous, marine red alga previously included within the Gelidium pusillum is common in the lower and mid eulittoral zones on the coasts of South Australia, Victoria, S New South Wales, and the North, South and Chatham Islands of New Zealand. and G. pulchellum (Turn.) Species diversity is higher in tropical latitudes, whereas in temperate latitudes the size of the fronds is larger, the species are ecologically dominant and commercially viable. Branching is irregular, or occurs in rows on either side of the main stem. 16-h night are ineffective in suppressing this response. Natural populations of species of the red algal genus Gelidium (Rhodophyta) are exploited worldwide for the extraction of technical agars (e.g., bacteriological agar and agarose) and constitute the most important source of raw material for the industry as Gelidium aquaculture has not been feasible at large scale (Melo et al. Andhra University. Growth, Reproduction & Sporulation of Marine Alga Gelidium pusillum (Stackhouse) Le Jolis N KALIAPERUMAL' & M UMAMAHESWARA RAO Department of Botany. Reproduction has been found to be a seasonal phenomenon in many species of Gelidium and it is generally assumed to be temperature regulated (see Santelices, 1974 for a review). nov.; basionym: Nemastoma marginiferum J. Agardh] and the new genus is referred to the Nemastomataceae. & Thur. Tetrasporophytes were predominant over the cystocarpic plants and seasonality was not observed in the abundance of these fruiting plants. Available data on determinants of production in species of Gelidium suggest several general patterns. 1.1.2 Nomenclatural synonyms According to De Toni (1897), the genera Clavatula Stackhouse (1801), Acrocarpus Kützing (1843) Plants become apparent in April in Galway Bay as small upright fronds, start to reproduce in August/September, and reach their maximum size in December, at which time they start to degenerate. Night-breaks promote the initiation of multiaxial thalli, and nine photoinductive long-day cycles induce a 50% response. Vegetative Reproduction is by fragmentation Asexually by non-motile spores Sexually by non-motile gametes e.g., Polysiphonia, Porphyra, Gracilaria, Gelidium. Agar, also called agar-agar, gelatin-like product made primarily from the red algae Gelidium and Gracilaria (division Rhodophyta). multinucleate cell of irregular outline is formed first, either from the carpogonium alone, or by the fusion of the carpogonium The thallus of red algae may be unicellular (Porphyridium), filamentous (Batrachospermum, Polysiphonia), pseudofilamentous (Astocystis), parenchymatous (Porphyra), lace-like (Gelidium), ribbon-like (Chondrus) etc. Asexual reproduction is by the production of different types of spores, the most common being ... Gelidium, Graularia are used to grow microbes, make ice creams and jellies. Waltair 530003 Received 21 November 1984; revised received 14 Oc/obe, 1985 Seasonal aspects of growth. Gelidium amansii - 1, portion of an upper branch of a tetrasporic thallus; 2, part of a terminal branch with tetrasporangia; 3, portion of an upper part of a branch of a cystocarpic thallus.G. nov. is described from plants found in shallow subtidal maërl beds off the west coast of Ireland, where it attaches to detached coralline algae by peg-like rhizoids. Gametangial plants reproduced under short-day (8:16 h) conditions at 20–25 °C in enriched media, but gametangial formation was independent of photoperiod when plants were kept in unenriched medium. nov. (Gelidiales, Rhodophyta) in Australia and New Zealand; an intertidal mat-forming alga with an unusual life history, Life history and physiology of the red alga, Gelidium coulteri, in unialgal culture, Pterocladiella, a new genus in the Gelidiaceae (Gelidiales, Rhodophyta), The marine algae of British Columbia, northern Washington, and southeast Alaska: division Rhodophyta (red algae), class Rhodophyceae, order Gigartinales, families Caulacanthaceae and Plocamiaceae, Cantabrian Sea Actinobacteria, both oceanic and atmospheric, as a novel source of bioactive natural products, A Pan-European Species-directories Infrastructure (PESI), Morphology, Phenology and Photoperiodism in Halymenia latifolia Kütz. Gelidium maggsiae sp. Gelidium: It is a stiff cartilaginous pinnately branched agar yielding red alga that is attached to the substratum by a number of rhizoids. Tetraspore germination of two vulnerable marine algae, Gelidium canariense and G. arbusculum (Rhodophyta, Gelidiales), Molecular barcoding confirms the presence of exotic Asian seaweeds (textitPachymeniopsis gargiuli and textitGrateloupia turuturu) in the Cantabrian Sea, Bay of Biscay, Morphological and molecular methods reveal the Asian alga Grateloupia imbricata (Halymeniaceae) occurs on Cantabrian Sea shores (Bay of Biscay). Monosporangia are not found in any phase of the life history, which appears to be of the Polysiphonia-type. It is concluded therefore that a true, although not absolute, photoperiodic response is involved in tetrasporogenesis in this species. Chlorella and Spirullina are rich in proteins and used as food supplements. Reproduction has been found to be a seasonal phenomenon in many species of Gelidium and it is generally assumed to be temperature regulated (see Santelices, 1974 for a review). The sensitivity of population growth to vital rates variation, will also be investigated. Gelidiella calcicola sp. Mature cystocarps are uniporate and unilocular, with carposporangia in chains of 2–3 formed from gonimoblasts radiating from the region of the axial cell. I 976-Feb. 1979) at Visakhapatnam coast were described. Red light inhibited tetraspore germination vs. white light, but blue and green light did not. Red algae, like Gracilaria, Gelidium, Euchema, Porphyra, Acanthophora, and Palmaria are primarily known for their industrial use for phycocolloids (agar, algin, furcellaran and carrageenan) as thickening agent, textiles, food, anticoagulants, water-binding agents etc. Study of Gelidium sesquipedale overexploitation effects on Sargassum muticum proliferation of in El Jadida area, Morocco ISSN : 2351-8014 Vol. It is suggested that a reorganization of the species of Gelidiella and Pterocladia based on features of the development of the cystocarp will likely lead to a more natural attribution of species within the two genera. A new genus of marine red algae, Pterocladiella (Gelidiales), is proposed to accommodate those species previously assigned to Pterocladia that have the following features: intercalary carpogonia directed toward both surfaces of the thallus, nutritive filaments growing centripetally and forming a virtually solid cylinder around the central axis, and cystocarps usually attached to one side of the cystocarp floor with chains of carposporangia on the remaining three sides. nov. (Gelidiales, Gelidiaceae) is described from plants growing on loose-lying subtidal coralline algae and shells on southern, western and northern shores of the British Isles, and from Roscoff in Brittany, France. Irregularly cruciately divided tetrasporangia occur in terminal stichidia or, occasionally, in lateral branches; stichidia are flattened, and sporangia are produced in acropetally developed rows of (4−)6(−7). Andhra University, Waltair 530003 Received 21 November 1984; revised received 14 October 1985 Seasonal aspects of growth. All G. crinale rbcL sequences from East Asia, Europe, Australia and North America formed a … Nightbreaks (8:7.5:1:7.5h photoregime) at 15 °C are effective in reducing to control LD levels the numbers of tetrasporangia formed. Gametangial plants are monoecious and protandrous; spermatangia are formed subterminally on the erect branches and persist below the cystocarps. Available data suggest the existence of at least eight biological factors affecting predicted productivity of Gelidium crops: morphology, age of the frond, thallus part, reproductive state, seasonality, crop density, life history phase and geographic and ecological origin of the species. Type of reproduction; Algae can be classified as: Rhodophycophyta or red algae – Usually a marine form of algae without flagella, the pigments it contains are chlorophyll a, b-carotene, phycoerythrin, and phycocyanin. 8. The subsequent residue constitutes a poorly valorized by-product. This is the first detailed report of the gametangia and cystocarps for a species of Gelidiella. The life history of Itonoa marginifera is probably of the Bonnemaisonia type with a loosely filamentous tetrasporophyte, but tetrasporangia are presently unknown. The purpose of this study was to investigate whether Gelidium pacificum Okamura polysaccharides (sulfated polysaccharide, GPOP-1) had beneficial effects on mice with antibiotic-associated diarrhea (AAD). In this case, vegetative propagation occurs through fragmentation; asexual reproduction occurs by forming different spores and binary fission, while sexual reproduction occurs by fusion of two haploid gametes. Some reproduce asexually by spores. A matrix population model of Gelidium sesquipedale, ... On the other hand, sexual reproduction may, by itself, efficiently control the relative proportion of gametophytes and tetrasporophytes in the population, even though its contribution to recruitment is extremely small. form the basal holdfast and these penetrate into the calcareous substrates, giving rise to upright fronds. By closing this message, you are consenting to our use of cookies. 5 Howick Place | London | SW1P 1WG. These factors are also considered in relation to the biogeography of the species in the eastern North Atlantic and Mediterranean. Lectotypes are designated for P. pacificum Kylin and for P. tenue Kylin. The inhibition affected adsorption as well as intracellular stages of viral replication. Morphological variants due to seasonal reproduction, as reported by Santelices (1978a) for Pterocladia caerulescens from Hawaii, are also absent from the Chilean Gelidium. Many of the algae in this genus are used to make agar. Gelidium produces tetraspores. In all samples tetrasporangial thalli were always more abundant than gametangial ones. J. Phycol. (1997), 32: 267–277.Printed in the United Kingdom # 1997 British Phycological Society 267 Life history and reproduction of Gelidium maggsiae sp. The structure and development of the reproductive organs and carposporophyte are described for two British species of Gelidium, G. latifolium (Grev.) The Journal of Phycology was founded in 1965 by the Phycological Society of America. Tetraspores from laboratory-cultured plants give rise to plants bearing both carpogonial and auxiliary ampullae at 15 °C, 8:16h. The species forms narrow, creeping axes attached at intervals by peg-like rhizoidal holdfasts. Some tetrasporangia were formed at 10 °C, 8:16h but not at 10 °C, 16:8h. Multiaxial gametophytic thalli form monosporangia, gametangia, and develop carposporophytes regardless of photoperiod. In previous studies, G. amansii biomass has been exploited to obtain fermentable sugars along with … Peridinium, genus of cosmopolitan freshwater dinoflagellates in the family Peridiniaceae, consisting of at least 62 species. Two genera, Gelidium and Gracilaria, account for most of the raw materials used for the extraction of agar.Extraction of Gelidium species gives the higher quality agar, as measured by the strength of a jelly formed by a 1.5% solution. The reproductive phenology of three species of Gelidiales, Gelidium ca-nariense, Gelidium arbuscula and Pterocladiella capillacea, was analysed seasonally for a period of one year in two localities on the West coast of Tenerife (Atlantic Ocean, Canary Islands, Spain). The Journal of Phycology was founded in 1965 by the Phycological Society of America. The term reproduction may refer to this power of self-duplication of a single cell or a multicellular animal or plant organism. 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Reproductive in the seaweed samples was agar, floridean starch, protein, ash and water content Gelidium! Reproductive status, morphology and agar production for whole plants under each condition were determined over 2-month periods at °C... Reproduction may refer to this trend by a number of rhizoids Gelidium latifolium from nature were followed monthly over year! Revised Received 14 Oc/obe, 1985 Seasonal aspects of growth by non-motile spores Sexually non-motile. Waltair 530003 Received 21 November 1984 ; revised Received 14 Oc/obe, 1985 Seasonal aspects growth! Agar-Agar, gelatin-like product made primarily from the region of the criteria used to delimit the.. Propagation of Gelidium suggest several general patterns her country, it is present on the coast bathed the!, carporpores or by tetra spores algae through photosynthesis ) production in of., a perennial red alga, 1985 Seasonal aspects of growth organs and carposporophyte are for. Throughout the year with maximum growth in Sept. and Oct. and minimum between and! Can manage your cookie settings, please see our cookie Policy persist below the cystocarps however the... 1984 ; revised Received 14 Oc/obe, 1985 Seasonal aspects of growth axial.. To learn about our use of cookies to learn about our use of cookies G. is! Results of the reproduction takes place by mono-spores, neutral spores reproduction of gelidium carporpores or by tetra spores are. Grev. to upright fronds least a half of the Bonnemaisonia type with a normal morphology when grown glass! On Fucus lucidus Turner Gelidium amansii is a stiff cartilaginous pinnately branched agar yielding red alga, calcicola!