Role of Auxin in Induction of Polarity in Fucus vesiculosus Zygotes

Role of Auxin in Induction of Polarity in Fucus vesiculosus Zygotes We studied the effects of auxin (indole-3-acetic acid) on formation of the primary polarity axis in zygotes of the brown algae Fucus vesiculosusL. Within the first 2.5 h after fertilization, the zygotes release this phytohormone in the ambient medium. The treatment of developing zygotes with the inhibitor of indole-3-acetic acid transport from the cell 2,3,5-triiodobenzoic acid at 5 mg/l arrests the auxin secretion and leads to its accumulation in the cells. This causes a significant delay in zygote polarization. The treatment of zygotes with the exogenous indole-3-acetic acid at 1 mg/l stimulates cell polarization and formation of a rhizoid protuberance. When auxin was added to the medium with triiodobenzoic acid, the inhibitory effect of the latter was eliminated. It has been proposed that the content of indole-3-acetic acid in the ambient medium is a key factor in the induction of polarity of the F. vesiculosus zygotes. Russian Journal of Developmental Biology Springer Journals

Role of Auxin in Induction of Polarity in Fucus vesiculosus Zygotes

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Kluwer Academic Publishers-Plenum Publishers
Copyright © 2003 by MAIK “Nauka/Interperiodica”
Life Sciences; Animal Anatomy / Morphology / Histology
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