Author:
Ascaso C.,Brown D. H.,Rapsch S.
Abstract
AbstractObservations have been made on the effects of different storage treatments, either 100°0 or 0°0 r.h., 12 h light:12h dark or 24 h dark for 2 days, on the ultrastructure of the phycobionts of Lobaria amplissima and Lasallia pustulata. After storage, Myrmecia, in the more desiccation-sensitive lichen L. amplissima, showed an increased number of cytoplasmic storage bodies which had more frequently dark contents and a half-moon-like appearance.Trebouxia, from the desiccation-resistant L. pustulata, showed major cellular disorganization when stored at 100°0 r.h. in the light:dark regime, whereas, in the dark, reorganization of thylakoids into a parallel arrangement occurred. Treatment at 0°0 r.h. in the light:dark regime induced an accumulation of starch around the pyrenoid of Trebouxia and, in the light:dark and dark regimes, a peripheral location of pyrenoglobuli without a decrease in the total volume of lipid material. The results are discussed in terms of the utilization and mobilization of reserve substances and the habitat preferences of the two lichens.
Publisher
Cambridge University Press (CUP)
Subject
Ecology, Evolution, Behavior and Systematics
Cited by
31 articles.
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