Please use this identifier to cite or link to this item:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE

Nuclear Features and Effect of Nutrients on Gymnodinium Catenatum (Dinophyceae) Sexual Stages

AuthorsFigueroa, Rosa Isabel CSIC ORCID; Bravo, Isabel; Garcés, Esther CSIC ORCID CVN ; Ramilo, Isabel
Gymnodinium catenatum
Life cycle
Nutritional effects
Issue DateFeb-2006
PublisherPhycological Society of America
CitationJournal of Phycology 42(1): 66-67 (2006)
AbstractGymnodinium catenatum Graham is an unarmored, cyst-forming dinoflagellate species responsible for outbreaks of paralytic shellfish poisoning. The nuclear development of the cells during the sexual cycle and the effect of different nitrate and phosphate external levels on sexual stages were studied. Nuclear fusion of gametes occurred before or at the same time as cytoplasmic fusion. During this process, either both nuclei migrated to a central area in the sulcal region, or only one of them migrated to the other nucleus. The motile and longitudinally biflagellated zygote presented a large, pear-shaped nucleus, and either divided or encysted. Planozygotes and germlings underwent similar division processes, which suggested an uncoordinated meiosis in both encysting and non-encysting zygotes. Encystment in culture was greater under low nitrate and phosphate limitation (L/15) than when only one or neither of these nutrients were added (L-N, L-P, and -N-P). However, planozygotes individually monitored achieved the maximum encystment (40%) in a medium with no phosphate or nitrate added (-N-P), while most of them divided (70%–90%) in replete (L1) or half-replete (L-N and L-P) media. Low levels of nitrate in the medium of cyst formation promoted a deficient development of the cyst wall. On the other hand, low phosphate levels in the medium of germination prevented both planozygote and germling division and lowered the final germination frequencies of cysts. The minimum dormancy, with an average value of 13.7±5.5 days, was not affected by any of the nutritional conditions studied
Description11 pages, 9 figures, 2 tables
Publisher version (URL)
Appears in Collections:(ICM) Artículos

Show full item record
Review this work

Page view(s)

checked on May 18, 2022

Google ScholarTM




WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.