のりの培養における雑藻防除剤の研究

概要

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Eleven kinds of commercially available herbicides were examined for elimination of algae which might contaminate the artificial culture of laver. Selective herbicidal activities of drugs were checked by comparing the growth of laver fronds and diatoms in cultures containing drugs of serial concentration. Paraquat and to some extent diquat, quaternary salt of bigyridyl, were found suitable as selective herbicides for laver. Various kinds of algae, diatoms, Chlorella (green algae), Brachy trichia (blue-green algae) were completely killed by paraquat in concentrations below 100mg/l, but laver was not affected by paraquat in concentrations below 700mg/l at any stage of the life cycle. The herbicidal action of paraquat is involved in photosynthesis, but the required light intensity was 1300lx. Selective resistance of laver to paraquat was involved in the characteristic sulfite reduction system conjugated with photosynthesis; cysteine added in the culture medium decreased the effect of resistance of laver. The stability of paraquat in seawater and fresh water and the effects of meatal ion, ascorbic acid, and light on its stability were examined.
日本水産學會の論文