Reproduction and cyst formation in Scrippsiella precaria (Dinophyceae)
作者:
Marina Montresor,
Donato Marino,
期刊:
Giornale botanico italiano
(Taylor Available online 1989)
卷期:
Volume 123,
issue 3-4
页码: 157-167
ISSN:0017-0070
年代: 1989
DOI:10.1080/11263508909430254
出版商: Taylor & Francis Group
关键词: dinoflagellates;Scrippsiella;Scrippsiella precaria;vegetative reproduction;ecdysis;encystment;cyst
数据来源: Taylor
摘要:
The life cycle ofScrippsiella precariaMontresor & Zingone was studied using a clonal culture. At 25[ddot]C and 100 μE/m2/s a maximum growth rate (kmax) of 0.53 div./d was calculated. Vegetative reproduction takes place through ecdysis. The naked protoplast emerges from a non motile cell characterized by a thin emphiesma. In some cases, cell division occurs after the loss of the parental amphiesma. In other cases, the division process is nearly complete when the two daughter cells are freed. In standard culture conditions, resting cyst formation was observed toward the end of the log growth phase. Cysts developed within a non-motile form, similar to the one preceding ecdysis. Attempts to observe conjugation and zygote formation were unsuccessful. Smaller, less pigmented cells were observed attached in the sulcal region. In all experiments conducted so far these cells, which we supposed to be gametes in analogy with other dinoflagellates, were not seen to fuse. The characteristics of the life cycle ofS. precariaare compared with those of other dinoflagellates.
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