ENDOPHYTIC ALGAE OF CHONDRUS CRISPUS (RHODOHYTA). II. ACROCHAETE HETEROCLADA SP. NOV., A. OPERCULATA SP. NOV., AND PHAEOPHILA DENDROIDES (CHLOROPHYTA)¹

Abstract

The occurrence of three endophytic green algae within Chondrus crispus Stackh. is reported. Two of them are new to science and are described as Acrochaete heteroclada Correa and Nielsen sp. nov. and A. operculata Correa and Nielsen sp. nov. The algae were studied in unialgal culture and in association with the host following infection of C. crispus under laboratory conditions. The experimental infection showed A. heteroclada to be initially epiphytic, with endophytic filaments growing into the cortex of the host during late infection. A. operculata is entirely endophytic when associated with the host. Phaeophila dendroides (Crouan frat.) Batters behaves as an epiphyte at 15 and 24°C but penetrates the host tissues at 20°C. For all three species, a close physical association with the host is established only when zoospores settle and germinate on the surface of C. crispus.

Effects of Temperature and Irradiance on Growth and Infection of Three Endophytic Green Algae

“…Kim et al (2014) ( , Different superscript letters within rows represent significant differences between treatments (Duncan's multiple test, P<0.05). Nielsen et al, 2013Nielsen et al, , 2014, (Correa et al, 1988;Correa and McLachlan, 1991, 1992Lein et al, 1991;Sán-chez et al, 1996;Del Campo et al, 1998;Gauna and Parodi, 2008).…”

“…, , (Correa et al, 1988;Correa and McLachlan, 1991, 1992. Ulvella , B. piliferum (Rinkel et al, 2012).…”

“…, (Chondrus crispus) Ulvella, Phaeophila, Bolbocoleon (genus) (Correa et al, 1988;Correa andMcLachlan, 1991, 1992).…”

Untitled

“…Plants of this species are generally found with different external morphological features and some plants contain a parasitic red alga called adelphoparasite, one of the marine partially endophytic algae. There have been several reports of adelphoparasites in the red, green, and brown seaweeds [5][6][7] . Goff et al 8 reported that nearly 15% of all known red algae genera occur only as parasites of other red algae.…”

“…They also suggested that the majority of the red algal parasites are very closely related to their host. The parasitic red seaweed not only causes morphological aberrations on their hosts but also reduces the value of its host as food 5,7,9 .…”