Effects of auxins and chemically related non-auxins on photosynthesis and chloroplast ultrastructure in Alaria esculenta (Laminariales)

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Abstract
Blade meristems of Alaria esculenta (L.) Grev. (Laminariales, Phaeophyta) were treated with growth-inhibiting concentrations (10−3 M) of auxins and chemically related non-auxins, e.g., 2,4- and 3,5-dichlorophenoxyacetic acids, respectively. Photosynthesis was inhibited with increasing effectiveness by both auxins and non-auxins in the following classes: naphthaleneacetic < naphthoxyacetic 14C incorporation into mannitol and amino acid fractions of alcohol-soluble organic matter was also modified by the inhibitors, especially phenoxyacetic acids.A 50% increase in photosynthetic rate of the blade meristem occurs within 24 h of its excision from the Alaria frond.