THE FUNCTIONAL AND PHYLOGENETIC SIGNIFICANCE OF DINOFLAGELLATE EYESPOTS
THE FUNCTIONAL AND PHYLOGENETIC SIGNIFICANCE OF DINOFLAGELLATE EYESPOTS
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DOI：
10.1016/0303-2647(83)90009-6
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发表时间：
1983-01-01
期刊：
影响因子：
1.6
通讯作者：
DODGE, JD
中科院分区：
文献类型：
--
作者：
DODGE, JD
来自5个种的眼点或柱头。甲藻[Woloszynskia coronata、W.tenuissima、W.tylota、Periddium cincum和Glenoddium foliaceum]可分为3个不同的类型：不受膜束缚的独立眼点；被3层膜包围的独立眼点；位于叶绿体外围的眼点。在所有情况下，眼点都位于纵沟或沟的后面，在眼点和细胞覆盖物或膜之间有一条微管。其中2例发源于纵鞭毛根部附近，该鞭毛穿过眼点，也负责细胞的定向运动。微管链被认为在定向刺激从眼点到鞭毛的传递中发挥了作用，并提出了一个假说来解释这可能是如何实现的。在系统发育上，不同类型的眼点的结构将这些甲藻与真甲藻和金藻联系在一起，在甲藻中发现的多样性可能反映了这一组中叶绿体的不同来源。
The eyespots or stigmas from 5 spp. of dinoflagellates [Woloszynskia coronata, W. tenuissima, W. tylota, Peridinium cinctum and Glenodinium foliaceum] fall into 3 distinct categories: independent eyespot which is not membrane bound; independent eyespot which is surrounded by 3 membranes; eyespot situated at the periphery of a chloroplast. In all cases the eyespot is situated behind the longitudinal groove or sulcus and there is a strand of microtubules between the eyespot and the cell covering or theca. In 2 cases the strand originated near the base of the longitudinal flagellum, which is the one passing over the eyespot and is also responsible for directional movement of the cell. The microtubular strand is presumed to play a part in the transmission of directional stimulation from eyespot to flagellum and a hypothesis is advanced to explain how this may be brought about. Phylogenetically, the structure of the various types of eyespots would link these dinoflagellates with euglenids and chrysophytes, and the diversity found in the dinoflagellates is probably a reflection of the diverse origin of chloroplasts in this group.