Induction of Conjugation and Spore Formation in Species of Spirogyra (Chlorophyceae, Zygnematales)

Simons, J.; Beem, A.P. van; Vries, P. J. R. De

doi:10.1111/j.1438-8677.1984.tb01823.x

Cited by 32 publications

(31 citation statements)

References 15 publications

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“…Moreover, SimonS et al (1984) found that nitrogen depletion results in the formation of secondary carotenoids and in sporopollenine synthe- sis, which is part of the hypnozygotes wall. The lack of inorganic nitrogen in the water seems to be involved in the differentiation of gametangia (SimonS et al 1984), which is also supported by the findings of yamaShita & SaSaki (1979), who found a high intracellular C/N ratio in generative cells. yamaShita & SaSaki (1979) stated that the accumulation of starch is necessary for the formation of ripe hypnozygotes.…”

Section: Discussionmentioning

confidence: 99%

“…In the most recent worldwide Zygnematalean flora of kadlUBowSka (1984), 381 Spirogyra species are listed, based on morphological traits like cell width, number of chloroplasts, type of cross wall, type of reproduction, formation of conjugation channels, shape of gametangia and as key characteristics for species delineation shape, pigmentation, dimensions, and sculpturing of ripe hypnozygotes. Taking into account the infrequent in situ observations of hypnozygotes, which are essential for species identification, there is an obvious need to induce sexual reproduction in the laboratory under de-fined conditions (grote 1977;SimonS et al 1984;yoon et al 2009). This is also of importance for scrutinizing the traditional species concept, and for implementing the taxon into biomonitoring surveys.…”

Section: Introductionmentioning

confidence: 99%

“…Further, she could not find certain vegetative and generative pH optima. Subsequent studies emphasized the role of nitrogen depletion and light as key factors to initiate the sexual phase in Spirogyra (yamaShita & SaSaki 1979;SimonS et al 1984). SimonS et al (1984) were able to induce formation of mature hypnozygotes in 31 species, which represented 40% of the total number of Spirogyra species described in the Netherlands at that time.…”

Section: Introductionmentioning

confidence: 99%

“…Subsequent studies emphasized the role of nitrogen depletion and light as key factors to initiate the sexual phase in Spirogyra (yamaShita & SaSaki 1979;SimonS et al 1984). SimonS et al (1984) were able to induce formation of mature hypnozygotes in 31 species, which represented 40% of the total number of Spirogyra species described in the Netherlands at that time. The important role of nitrogen depletion for the onset of sexual reproduction was confirmed by the work of dell' Uomo & maSi (1985), who studied a community of Zygnemataceae in nature during one year.…”

Section: Introductionmentioning

confidence: 99%

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Induction of sexual reproduction in Spirogyra clones - does an universal trigger exist?

Zwirn¹,

Chen²,

Uher³

et al. 2013

Fottea

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Species identification of the ubiquitous green algae genus Spirogyra link based on the traditional morphological species concept requires sexual reproduction stages including ripe hypnozygotes. Since these stages are only infrequently observed in nature, an artificial onset of the sexual phase in the laboratory would be most welcome. We therefore tried to induce conjugation in 95 strains of Spirogyra originating from various European sampling localities. A linear discriminant analysis based on a comparison of abiotic field data between sites with vegetative and conjugating filaments indicated that nitrate deprivation together with elevated organic compounds of N and P promotes conjugation. In the laboratory, altogether 681 experimental setups were conducted with a focus on variation of nutrient supply and irradiance conditions. No general trigger could be found promoting sexual reproduction in the genus, but the importance of certain nutrient ratios according to specific ecological demands seems likely. Besides nitrate depletion, also red, green and white light sometimes yielded in sexual reproduction stages, whereas ultraviolet radiation and blue light never resulted in hypnozygote formation. Detailed mechanisms of recognition between the compatible filaments are still unknown; apomixis and/or heterothallism might be an explanation for the low success rate in sex induction.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Induction of sexual reproduction in Spirogyra clones - does an universal trigger exist?

Zwirn¹,

Chen²,

Uher³

et al. 2013

Fottea

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“…Коньюгация нитчатых водорослей -быстро протекаю-щий процесс (Ижболдина, 2007). На момент сбора проб для данного исследования коньюгации не происходило, а наблюдать ее в искусственных условиях не было воз-можности, так как для этого требуется длительное и тру-доемкое культивирование (Algal culturing techniques, 2005, p. 13; Ikegaya et al, 2012;Simons et al, 1984;Stabenau, Säftel, 1989). Данные молекулярного анализа позволили подтвердить принадлежность исследованных образцов нитей водорослей, различающихся по степе-ни скрученности спиралевидного хлоропласта, к роду Spirogyra.…”

Section: Discussionunclassified

Identification of filamentous green algae from an area of local biogenic pollution of Lake Baikal (Listvennichnyy bay) using SSU 18S rDNA molecular marker

Романова

Владимировна²,

Кравцова

et al. 2013

Ecological genetics

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Background. A local eutrophication process is noted for the first time in Listvennichnyi bay in Lake Baikal. High level of biogenic elements in the water of the bay led to nuisance growth of filamentous algae. Rapid identification of these algae's taxa was necessary to assess ecosystem damage in the polluted area of the lake. Materials and methods. We determined a boundary of bottom fouling by locating transects ranging from 0 to 10 meters in different areas of the bay. Algae samples were examined using microscopic techniques as well as SSU 18S rDNA sequencing. Phylogenetic trees were estimated using Bayesian inference (BI) based on SSU alignment. Results. Our results showed intensive filamentous algae fouling in depth from 3 to 10 meters along the coastline of the eastern part of the bay. Morphological and molecular analysis demonstrated prevalence in samples of Ulothrix zonata (Web. et Mohr) Kütz. Using SSU 18S rDNA sequencing data we also showed presence of three species of Spirogyra Link. genus. Conclusion. Detection of Spirogyra species which are normally not typical for such areas of the lake along with Ulothrix zonata extended more deeply than usually observed reveals severe phytocenosis disturbance of the polluted part of Lake Baikal.

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Systematics and Evolution of the Algae

Melkonian

1986

Progress in Botany

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Induction of Conjugation and Spore Formation in Species of Spirogyra (Chlorophyceae, Zygnematales)

Cited by 32 publications

References 15 publications

Induction of sexual reproduction in Spirogyra clones - does an universal trigger exist?

Induction of sexual reproduction in Spirogyra clones - does an universal trigger exist?

Identification of filamentous green algae from an area of local biogenic pollution of Lake Baikal (Listvennichnyy bay) using SSU 18S rDNA molecular marker

Systematics and Evolution of the Algae

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