Adatok a Ducellieria chodatii nyugat-magyarországi előfordulásához

Bancsó, Sándor

doi:10.17542/kit.28.019

kitaibelia

2023

DOI: 10.17542/kit.28.019

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Adatok a Ducellieria chodatii nyugat-magyarországi előfordulásához

Sándor Bancsó

Abstract: Kőszeg közelében, az Alsó-erdőben fellelhető tőzegmohás átmeneti láp közel három éve indult algológiai vizsgálata során 2022 tavaszán egy új, korábban még nem jegyzett faj került elő, a Ducellieria chodatii (Ducellier) Teiling. Fenyőpollen parazita lévén felbukkanása összefüggésbe hozható a környező fenyves, illetve fenyő elegyes állományok utóbbi időben tapasztalható fokozott pollentermelésével. Mind morfológiai szempontból, mind az élőhely környezeti adottságait illetően a vizsgálatok eredményei javarészt i… Show more

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2023

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Ducellieriales ord. nov. and evidence for a novel clade of endobiotic pollen-infecting "lagenidiaceous" Peronosporomycetes

Buaya,

Thines

2023

Fungal Systematics and Evolution

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The genus Ducellieria (Ducellieriaceae) contains three species (D. chodatii, D. tricuspidata, D. corcontica), and a single variety (D. chodatii var. armata) of obligate endobiotic pollen parasites. These organisms have been first assigned to the green alga genus Coelastrum, as they form very similar spherical structures, but the observation of heterokont zoospores has led to their reclassification to the phylum Oomycota. However, despite their widespread nature, these organisms are only known from their descriptive morphology, and life cycle traits of some species still remain incompletely known. Only the type species, D. chodatii, has been rediscovered several times, but the phylogeny of the genus remains unresolved, since none of its species has been studied for their molecular phylogeny. At present the genus is still included in some algal databases. To clarify the evolutionary affiliation of Ducellieria, efforts were undertaken to isolate D. chodatii from pollen grains, to infer its phylogenetic placement based on nrSSU sequences. By targeted isolation, the pollen endoparasitoid was rediscovered from three lakes in Germany (Mummelsee, Okertalsperre, Knappensee). Apart from the typical coelastrum-like spheroids, oomycetes sporulating directly from pollen grains in a lagenidium-like fashion were observed, and molecular sequences of both types of oomycetes were obtained. Phylogenetic reconstruction revealed that coelastrum-like and lagenidium-like forms are unrelated, with the former embedded within the deep branching early-diverging lineages, and the later stage forming a distinct clade in Peronosporales. Consequently, the life cycle of D. chodatii needs careful revision using single-spore isolates of the species, to infer if previous lifecycle reconstructions that involve various different thallus types are stages of a single species or potentially of several ones.

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Ducellieriales ord. nov. and evidence for a novel clade of endobiotic pollen-infecting "lagenidiaceous" Peronosporomycetes

Buaya,

Thines

2023

Fungal Systematics and Evolution

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Adatok a Ducellieria chodatii nyugat-magyarországi előfordulásához

Cited by 1 publication

References 6 publications

Ducellieriales ord. nov. and evidence for a novel clade of endobiotic pollen-infecting "lagenidiaceous" Peronosporomycetes

Ducellieriales ord. nov. and evidence for a novel clade of endobiotic pollen-infecting "lagenidiaceous" Peronosporomycetes

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