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GROWTH RESPONSES OF THE DIATOM, CYCLOTELLA CRYPTICA (BACILLARIOPHYCEAE), TO GIBBERELLIC ACID 1
Author(s) -
Adair Olivia V.,
Miller Margaret W.
Publication year - 1982
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1982.tb03225.x
Subject(s) - axenic , diatom , biology , gibberellic acid , botany , cell , plant cell , biophysics , biochemistry , germination , bacteria , genetics , gene
The plant hormone, gibberellic acid (GA), stimulated growth of a marine diatom, Cyclotella cryptica Reimann, Lewin and Guillard. Four concentrations of GA (5 × 20 × 25 × and 35 × 10 −6 g/mL) were added to axenic cultures of C. cryptica. Changes in cell densities, measured by cell counts and turbidimetric readings, confirmed that GA at 20 × 10 −6 g/mL produced maximum stimulation. There was an increase in the total number of cells produced and a shorter lag phase of growth at this concentration. Coulter counter measurements of cell size, as well as ocular micrometer measurements, indicated there was no significant variation in cell volumes of GA grown cells over that of the controls.