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- W2280457026 abstract "Cysts of Scrippsiella trochoidea are representative of the thick-wallednon-motile resting cells produced by many dinoflagellates.Although the influence of cysts on the biology and ecology ofdinoflagellates may be significant, little is known of the factorscontrolling cyst dormancy and germination, or of the metabolicfoundations of these processes. This study addresses these issuesusing cysts produced and manipulated under defined conditions inlaboratory culture.Scrippsiella trochoidea cysts experienced a period of dormancy,lasting approximately 25 days, during which germination did not occur.The duration of this period was not affected by temperature. Cystswhich had completed their dormancy period remained quiescent untilpermissive environmental conditions were established. Quiescent ~trochoidea cysts remained viable at 3°C in the dark for at least 350days.Germination in quiescent S. trochoidea cysts was photomorphogenicallycontrolled: cysts deprived of light but otherwiseprovided with optimal environmental conditions failed to germinate.The light requirement was satisfied to a large extent by a single,brief, low intensity exposure (a photon fluence of 0.2 μmol m-2white light elicited a 50% response). Yellow-green light (λ≈550nm) was found to be most effective.Temperature exerted significant control over germination as well.Germination rate was maximal above 14°C; it decreased rapidly astemperature decreased below this level. Ultimate achieved germinationfrequency, in contrast, was relatively insensitive to temperature. Thetemperature range optimal for cyst germination did not preciselycoincide with that for vegetative growth. Thus germination was greatlyretarded at low temperatures which supported good vegetative growth,but on the other hand proceded optimally at high temperatures whichcompletely inhibited such growth.The most conspicuous compositional attribute of ~ trochoidea cystswas their increased carbohydrate content, which was 10 times that ofexponentially growing cells. Cysts contained significantly lessprotein and chlorophyll-a than vegetative cells, while the lipidcontent of the two forms was comparable. The respiratory activity ofquiescent cysts was estimated to be approximately 1.5% of that invegetative cells. Although chlorophyll-a persisted in quiescent cysts,no photosynthetic activity could be detected therein.The germination of S. trochoidea cysts was accompanied by animmediate increase in respiratory activity, with carbohydrate servingas the principal substrate. Protein synthesis became apparent within24 hr of activation, followed by a dramatic increase in bothchlorophyll-a and photosynthetic activity just prior to excystment.Encystment and germination in S. trochoidea represent developmentalpatterns which are regulated by specific, albeit not yet wellunderstood, environmental and biological parameters. The furtherelucidation of these processes and their regulation will lead to abetter understanding of…" @default.
- W2280457026 created "2016-06-24" @default.
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- W2280457026 date "1986-01-01" @default.
- W2280457026 modified "2023-09-27" @default.
- W2280457026 title "The physiology of dormancy and germination in cysts of the marine dinoflagellate Scrippsiella trochoidea" @default.
- W2280457026 doi "https://doi.org/10.1575/1912/3419" @default.
- W2280457026 hasPublicationYear "1986" @default.
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