[Role of auxin in induction of polarity in zygotes of Fucus vesiculosus L].
We studied the effects of auxin (indolyl-3 acetic acid) on formation of the primary polarity axis in zygotes of the brown algae Fucus vesiculosus. Within the first 2.5 h after fertilization, the zygotes release this phytohormone in the environment. The treatment of developing zygotes with the inhibitor of indolyl-3-acetic acid transport from the cell 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 indolyl-3-acetic acid at 1 mg/l stimulates cell polarization and formation of a rhizoid process. When auxin was added to the medium with triiodobenzoic acid, the inhibitory effect of the latter was fully relieved. It has been proposed that the content of indolyl-3-acetic acid in the environment is a key factor in the induction of polarity of the F. vesiculosus zygotes.
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St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034 Russia.
Tarakhovskaia
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ER
Maslov
Iu I
IuI
Polevoĭ
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AV
D016764:Cell Polarity / Q000187:drug effects*; D044645:Fucus / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D007210:Indoleacetic Acids / Q000494:pharmacology*; D010937:Plant Growth Regulators / Q000494:pharmacology; D014283:Triiodobenzoic Acids / Q000494:pharmacology; D015053:Zygote / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism
D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; D014283:Triiodobenzoic Acids; C030737:indoleacetic acid