| Autor: |
Takano, Tomoyuki, Ikegaya, Hisato, Ikeda, Kenichi, Nozaki, Hisayoshi, Sakayama, Hidetoshi |
| Zdroj: |
Phycologia; July 2022, Vol. 61 Issue: 4 p425-435, 11p |
| Abstrakt: |
ABSTRACTCharacteristics of transverse walls in filaments, and modes of conjugation are essential for species identification in the genus Spirogyra. Although most Spirogyraspecies have plane transverse walls, species with other types of transverse walls (replicate, semi-replicate and colligate types) have also been described. Recent molecular phylogenetic studies grouped species with replicate transverse walls in a single clade. However, phylogenetic positions of Spirogyraspecies with semi-replicate and colligate transverse walls have not yet been clarified. We examined vegetative and reproductive traits of two Spirogyraspecies with replicate and semi-replicate transverse walls collected in Japan, under culture conditions. One of them resembled most S. crassispinain having replicate transverse walls and both scalariform and lateral conjugation, with conjugation tubes separated from the filaments in lateral conjugation. However, these two species differed in their vegetative filaments, zygospores and mesospores; and the molecular phylogenetic analyses placed the Japanese strain with replicate transverse walls in a lineage separate from other previously known species with replicate transverse walls. Vegetative filaments of the other Japanese strain had semi-replicate transverse walls resembling those of previously known species S. unduliseptumand S. narcissiana. This strain differs from S. unduliseptumby the variation in zygospore ornamentation and from S. narcissianaby the presence of three types of conjugation; and it formed an independent lineage that was phylogenetically separated from two Spirogyralineages characterized by having replicate transverse walls. The two Japanese strains reported on are described herein as S. minuticrassispina sp. nov. and S. tertia sp. nov. |
| Databáze: |
Supplemental Index |
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