Cytotaxonomical Studies on Cladophora flexuosa (Griff.) Harv., a Marine sp
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概要
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1. The complete life history of C. flexuosa has been investigated by the author for the first time on the basis of cytological observations and on the formation of reproductive swarmers.2. Stages of meiosis are found occurring preceding the formation of quadriflagellate zoospores. Biflagellate gametes are formed as a result of mitotic divisions. This leads to the conclusion that C. flexousa possesses a life history of isomorphic alternation of generations, similar to C. pellucida as reported by Foÿn (1929).3. The process of nuclear division during mitosis follows a normal course and the number of chromosomes has been estimated 24 from the mitotic metaphase which is the diploid number of this sp. Number of 12 bivalents has been estimated during meiosis.4. The morphology of the chromosomes in regard to the position of centromeres has been studied. The chromosomes show median and submedian centromeres. In the meiotic bivalents, the numbers of chiasmata have been traced out. Out of 12 bivalents, 7 bivalents show one chiasma each and the rest 5 bivalents show two chiasmata each.5. The detailed morphological characters of the present marine sp. have been studied. The width of the main filaments of C. flexuosa (Griff.) Harv. seem to vary from 80μ to 185μ.6. Besides morphological characters i.e. the dimension of the filaments and the type of branching, shape and size of the reproductive swarmers appear to be specific for definite spp. and can also be helpful in distinguishing species of Cladophora.7. The sp. of Cladophora can also be distinguishable in the dimensions of the resting nuclei and in the sizes of the chromosomes.8. The method of staining by acetocarmine has been used throughout the investigation for cytological study.
- 財団法人 日本メンデル協会の論文
財団法人 日本メンデル協会 | 論文
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