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AUXIN, AN ENDOGENOUS REGULATOR OF GROWTH IN ALGAE? 1, 2
Author(s) -
Buggeln Richard G.
Publication year - 1976
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.1529-8817.1976.tb02856.x
Subject(s) - auxin , biology , algae , endogeny , regulator , botany , biochemistry , plant growth , microbiology and biotechnology , gene
SUMMARY The effects of 5 pairs of synthetic auxins and chemically related, but biologically inactive, derivatives (e.g., 2,4‐ and 3,5‐dichlorophenoxyacetic acid, respectively) on blade growth of the brown alga, Alaria esculenta (L.) Grev.(Laminariales) were studied. The significant result was the inability to divide the growth responses into auxin and non‐auxin groups. At high concentrations (10 −3 M) 9 test substances inhibited blade growth; lower concentrations (<10 −3 M) were either slightly inhibitory or showed no effect. The data suggest that a higher plant auxin‐specific recognition mechanism is lacking in this alga. As this mechanism is central to higher plant concepts of growth control by auxin, the role of auxin as an endogenous regulator of growth in Alaria, and perhaps other algae as well, seems unlikely. This interpretation is consistent with recent negative biochemical data from auxin binding studies using subcellular preparations from algae.