NDLI: Myrionema strangulans (Chordariales, Phaeophyceae) epiphyte on Ulva spp. (Ulvophyceae) from Patagonian Atlantic coasts

Content Provider	Springer Nature Link
Author	Siniscalchi, Amira Gabriela Gauna, María Cecilia Cáceres, Eduardo J. Parodi, Elisa R.
Copyright Year	2012
Abstract	Fronds of Ulva spp. from Patagonian Atlantic coasts exhibited brown spots produced by the presence of Myrionema strangulans (Chordariales, Phaeophyceae). The occurrence of M. strangulans on Ulva spp. is widely reported from several regions of the world, but there were no detailed studies about the subject. In the present study, we describe the morphology and interactions of M. strangulans with Ulva spp. as observed under light and electron microscopes, and we reconstruct all stages of its life cycle based upon in vitro experiments. The prevalence of infection by M. strangulans was 100%. In case of the strongest epiphytism, the host cuticle exhibited perforations, massive depigmentation, cellular disorganization, and cuticle rupture. It was possible to demonstrate a purely epiphytic life strategy of the organism by transmission electron microscopy. M. strangulans formed discoid thalli constituted by vegetative filaments and radiating from a central zone to a peripheral zone. Transversally, the discs were formed by two strata: a basal monostromatic and a filamentous erect stratum. From the monostromatic stratum, hyaline hairs and reproductive structures were produced. Both plurilocular and unilocular sporangia were present. Zoids from both plurilocular and unilocular sporangia were able to germinate in culture. M. strangulans exhibited a haploid–diploid, heteromorphic life cycle with thalli with three different morphologies. The haploid chromosome number was 12 ± 2 chromosomes.
Starting Page	475
Ending Page	486
Page Count	12
File Format	PDF
ISSN	09218971
Journal	Journal of Applied Phycology
Volume Number	24
Issue Number	3
e-ISSN	15735176
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-02-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Epiphyte Life cycle Myrionema strangulans Patagonian Atlantic coast Ulva spp. Freshwater & Marine Ecology Plant Sciences Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Aquatic Science

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Myrionema strangulans (Chordariales, Phaeophyceae) epiphyte on Ulva spp. (Ulvophyceae) from Patagonian Atlantic coasts