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Some Biological Characteristics of Chlorotic Substrains of Euglena gracilis. *
Author(s) -
GROSS J. A.,
JAHN T. L.
Publication year - 1958
Publication title -
the journal of protozoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 0022-3921
DOI - 10.1111/j.1550-7408.1958.tb02539.x
Subject(s) - euglena gracilis , chlorosis , pigment , botany , biology , chlorophyll , carotenoid , euglena , plastid , chemistry , biochemistry , chloroplast , gene , organic chemistry
SYNOPSIS. It has been assumed by others that green euglenas and derived bleached forms are physiologically equivalent except for chlorophyll and plastids. Some workers, however, have remarked upon differences which might depend on the mode of bleaching. Several hitherto undescribed chlorotic substrains of E. gracilis var. bacillaris were examined for pigment alteration, growth under a variety of conditions, and ability to withstand high temperature. These studies indicated physiological variation in the different chlorotic substrains. Although all were apparently chlorophyll‐less and aplastidic, only one seemed completely achromatic. The carotenoid content of others varied. Metabolic changes manifested by altered pigmentation may reflect enzymatic variation caused by the chlorosis‐inducing agents.