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New evidence of phylogeny of the genus Chloromonas
Chen Shan; Xu Min; Hu Hong-jun; Inst Hydrobiol, Chinese Acad Sci, Wuhan, 430072, China
2004
Source PublicationActa Hydrobiologica Sinica
ISSN1000-3207
Volume28Issue:1Pages:29-32
AbstractThe phylogenetic relation and taxomomic status between genus Chloromonas and genus Chlamydomonas are uncertain in phycological field, since that the microstructure of them are much similar and both are unicellar groups with two equal-lengthed flagellas, the difference is just in that, the Chlamydomonas species have more than one pyrenoid on the chloroplast while the Chloromonas species have none ever since being reported. Therefore, as to the unicellar flagellated groups, the character of having a pyrenoid or not is of great significance in taxonomy. Whereas, many scholars have doubted the stability of this character of not having pyrenoid and that is why the argument is still in pendency for long years. The recent research for Chloromonas species are mostly carried out on microscopic levels, but not in the fields of ultrastructure, life history and molecular phylogenetics. In this article we have compared the ultrastructure and microstructure of a newly reported alga of Chloromonas sinica by H. J. Hu et C. T. Yin (2002) to that of Chlamydomonas species, finding that they are in highly similarity except for that Chloromonas sinica does have no pyrenoid in its whole life history, which starts from the period of spores. The truth is proved by the ultrastructure evidence. What' s more, we have also study the Chloromonas sinica by its flagellar structure, character of cell wall and chloroplast figures, knowing that the pattern of fibrovascular structure in the flagella transition region of Chloromonas sinica is much the same with that of Chlamydomonas species, and it is also the same for the young cell wall character in Chloromonas sinica, being compared to that of sporangium wall in the Chlamydomonas species. And there are some special differed characters between Chloromonas sinica according to other Chloromonas species in the observation: 1) it has no colour and leads a heterotrophic life while cultured without lights supply. Only under illumination can the chloroplast develop normally and the cells turn green with bigger irregular discoid chloroplasts, while the colorless cells are having smaller round ones in contrast, which still can be seen clearly in the microscopy. Besides these, the thylakoids are very rear and short in the colourless cells. While in mature cells of normal condition the thylakoids are full of the whole chloroplast, which also possess I or more starch grains. 2) the colourless cell wall is thicker than normal, being of 3 layers; the green ones' cell wall is very thin and have less layers or even just have one layer. However, this difference in cell wall being connected to its nourish pattern or not needs to go deep into in the future. Though molecular phylogenetics research of genus Chloromonas and genus Chlamydomonas shows that they are polyphylogentic, plenty studies are needed to do to confirm if Chloromonas is a subgenus of Chlamydomonas, or a genus of Chlamydomonas. And now before getting enough evidence, it is more reasonable to take the Chloromonas as a seperate genus from the genus Chlamydomonas.
Indexed By其他
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/18159
Collection期刊论文
Corresponding AuthorChen Shan; Inst Hydrobiol, Chinese Acad Sci, Wuhan, 430072, China
Recommended Citation
GB/T 7714
Chen Shan,Xu Min,Hu Hong-jun,et al. New evidence of phylogeny of the genus Chloromonas[J]. Acta Hydrobiologica Sinica,2004,28(1):29-32.
APA Chen Shan,Xu Min,Hu Hong-jun,&Inst Hydrobiol, Chinese Acad Sci, Wuhan, 430072, China.(2004).New evidence of phylogeny of the genus Chloromonas.Acta Hydrobiologica Sinica,28(1),29-32.
MLA Chen Shan,et al."New evidence of phylogeny of the genus Chloromonas".Acta Hydrobiologica Sinica 28.1(2004):29-32.
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