INVESTIGADORES
GAUNA Maria Cecilia
congresos y reuniones científicas
Título:
Ulva lactuca (Ulvophyceae) epiphyted by Myrionema strangulans (Chordariales, Phaeophyceae) from Patagonian coasts.
Autor/es:
SINISCALCHI, AMIRA; GAUNA M. CECILIA; CROCE, M. EMILIA; PARODI, ELISA R.
Lugar:
Halifax
Reunión:
Congreso; 4th Congress of the International Society for Applied Phycology; 2011
Resumen:
On the Ulva lactuca L. fronds were observed brown sport produced by the presence of Myrionema strangulans Greville (Chordariales, Phaeophyceae). M. strangulans thalli formed epiphytic discs constituted by vegetative filaments radiating from central zone to zone peripheral. These epiphytic discs were formed by two strata: monostromatic basal and filamentous erect. From monostromatic stratum were generated reproductive structures and hyaline hairs. These thalli formed both pluriloculars and uniloculars sporangia. M. strangulans was a organism exclusively epiphytic and presented a prevalence of infection of 100% on U. lactuca fronds. It were determinate different degrees of infection, being the highest a low degree of epiphytism. In case of strong epiphytism, the hosts’s cuticle exhibited perforations, massive depigmentation, cellular disorganization, cuticle rupture and perforations. Under conditions cultures were germinated zoids from pluriloculars and unilocular sporangia. The development of both cells led to illustrate the life cycle of epiphytic specie. The specie exhibit a haplo-diplontic and heteromorphyc life cicle, with three different thalli’s morphology. Also were determinate haploid and diploid number chromosomic, being them 44 and 22, respectively. As is known, the interaction between M. strangulans and U. lactuca is widely reported from several region of world, but were not reported specific papers about them. For that, the aim of this paper is to describe this interaction between both organisms, and especially to describe the life cycle of epiphytic specie.