The life history of Bangia atropurpurea (Bangiales, Rhodophyta) from the Alcantara River (Sicily, Italy) was studied in the field and laboratory. An alternation between a macroscopic phase and a microscopic filamentous conchocelis phase was found, and spermatia and carpogonia are described for the first time in a freshwater population of the species. Endosporangia have also been discovered on gametophytic plants in culture. In addition, the conchocelis phase produced either conchosporangia or monosporangia, and reproduction by fragmentation was common. Sexuality was indicated by chromosome counts of n = 3 and 2n = 6 in gametophytes and sporophytes, respectively; resting cells were observed in both.
Sexual and asexual reproduction in a freshwater population of Bangia atropurpurea (Bangiales, Rhodophyta) from eastern Sicily (Italy)
GARGIULO, Gaetano;GENOVESE, Giuseppa;MORABITO, Marina;
2001-01-01
Abstract
The life history of Bangia atropurpurea (Bangiales, Rhodophyta) from the Alcantara River (Sicily, Italy) was studied in the field and laboratory. An alternation between a macroscopic phase and a microscopic filamentous conchocelis phase was found, and spermatia and carpogonia are described for the first time in a freshwater population of the species. Endosporangia have also been discovered on gametophytic plants in culture. In addition, the conchocelis phase produced either conchosporangia or monosporangia, and reproduction by fragmentation was common. Sexuality was indicated by chromosome counts of n = 3 and 2n = 6 in gametophytes and sporophytes, respectively; resting cells were observed in both.Pubblicazioni consigliate
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