Die Reduktionsteilung beiCladophora glomerata

Schussnig, Bruno

doi:10.1007/bf01255590

Cited by 18 publications

(2 citation statements)

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“…). Ulvales (Yamada and Saito ), Trentepohliales (Printz ) and Cladophorales (Schussnig , Parodi and Cáceres ) have isomorphic haplo‐diplontic cycles, in which a gametophyte and sporophyte have an identical form. Bryopsidales has various life‐cycle systems within the order.…”

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confidence: 99%

Nuclear behavior and roles indicate that Codiolum phase is a sporophyte in Monostroma angicava (Ulotrichales, Ulvophyceae)

Horinouchi

Yamaguchi

Chibana

et al. 2019

Journal of Phycology

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The life‐cycle system of Ulotrichales, a major order of Ulvophyceae, remains controversial because it is unclear whether the Codiolum phase, a characteristic unicellular diploid generation in ulotrichalean algae, is a zygote or a sporophyte. This controversy inhibits the understanding of the diversified life cycles in Ulvophyceae. To distinguish between zygotes and sporophytes, we have to examine not only whether diploid generations function as sporophytes, but also whether mitosis occurs before meiosis in diploid generations. However, the nuclear behavior in the Codiolum phases is largely unknown, probably because no suitable methods are available. Using fluorescent microscopy with ethidium bromide and transmission electron microscopy of cell‐wall‐dissected specimens, we report the nuclear behavior in the Codiolum phases of an ulotrichalean alga with a representative life cycle, Monostroma angicava. Each vegetative Codiolum phase had a single polyploid nucleus due to endoreduplication, a type of mitosis without nuclear division. During zoosporogenesis, the nucleus had a structure that would be a meiosis‐specific complex. We quantitatively showed that Codiolum phases grew extremely large and produced numerous zoospores. Our results suggest that an event comparable to mitosis occurs before meiosis in the Codiolum phase of M. angicava. This nuclear behavior and the functions (growth and zoospore production abilities) correspond to those of sporophytes. Therefore, the life‐cycle system of M. angicava is a heteromorphic haplo‐diplontic cycle. This system appears to be widely adopted among other ulotrichalean algae.

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confidence: 99%

Nuclear behavior and roles indicate that Codiolum phase is a sporophyte in Monostroma angicava (Ulotrichales, Ulvophyceae)

Horinouchi

Yamaguchi

Chibana

et al. 2019

Journal of Phycology

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“…Foyn 1929and 1934, Czempyrek 1930, List 1930, Higgins 1930, Geitler 1936, Bliding 1936, Schussnig 1928, 1938, 1951-54 and 1955, Sinha 1958, 1963and Noor 1965 Schussnig (1928Schussnig ( , 1951 and List (1930) in C. glomerata. Schussnig (1930), Foyn (1929 and1934) and Sinha (1936 and.…”

Section: Morphological Observationsmentioning

confidence: 99%

A Study on the Cytology and Life-history of <i>Cladophora uberrima</i> Lambert. from Ranchi, India

Sinha

Ahmed

1973

CYTOLOGIA

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On the Life Cycle, Cytology and Taxonomy of Cladophora Callicoma From India

Shyam

1980

American J of Botany

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The present investigation deals with the cultural observations on the morphology, reproduction, life cycle, cytology and taxonomy of a freshwater Cladophora, C. callicoma (L.) Kütz, from India. There is a regular isomorphic alternation of generations between quadriflagellate zoospore‐producing diploid plants and biflagellate isogamete‐producing haploid plants, coupled with heterothallism in the latter. Chromosome numbers of n = 12 and 2n = 24 were determined respectively for gametophytes and sporophytes. Twelve bivalents were counted in meiosis where chiasmata varied from one to three. In light of above observations, the affinity of C. callicoma with C. glomerata, to which the former has often been assigned, has been discussed. It is proposed that the C. glomerata complex, which consists of intraspecific polyploid races, might have two distinct lines of evolution with regard to life cycle; one with forms having higher ploidy levels and lacking an alternation of generations, and the other with forms having low ploidy levels and alternation of generations.

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Die Reduktionsteilung beiCladophora glomerata

Cited by 18 publications

References 6 publications

Nuclear behavior and roles indicate that Codiolum phase is a sporophyte in Monostroma angicava (Ulotrichales, Ulvophyceae)

Nuclear behavior and roles indicate that Codiolum phase is a sporophyte in Monostroma angicava (Ulotrichales, Ulvophyceae)

A Study on the Cytology and Life-history of <i>Cladophora uberrima</i> Lambert. from Ranchi, India

On the Life Cycle, Cytology and Taxonomy of Cladophora Callicoma From India

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