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Production d'une substance rhizogène à effet similaire à celui de l'acide indole acétique par le ver de terre Lumbricus terrestris

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In vitro biological tests show that excreta or gross total and partial extracts of Lumbricus terrestris stimulate rhizogenesis and enhance root growth in young plants of the bean Phaseolus vulgaris. Similar results were obtained in experiments with worms freshly collected in the field and with worms previously deprived of food for 4 weeks. The rhizogenous substance produced by the worms is therefore not of exogenous origin, coming from the soil via the digestive tract. The similar effects of indol acetic acid at different concentrations and of excreta and gross extracts of worms in various dilutions indicate that the rhizogenous substance is similar to indol acetic acid, a well-known phytohormone in plants. Expressed as indol acetic acid equivalents, the quantity of the rhizogenous substance in worms would be approximately 18 × 103 ng/g, of which half (9 × 103 ng/g) is released in the excreta alone.[Journal translation]

Les tests biologiques réalisés in vitro dans ce travail, montrent que les excrétions ou les extraits bruts total et partiel de Lumbricus terrestris stimulent la rhizogenèse et améliorent la croissance racinaire des plantules de haricots Phaseolus vulgaris. Les expériences réalisées à partir de vers fraîchement récoltés du terrain et d'autres préalablement privés de nourriture pendant 4 semaines donnent des résultats similaires. La substance rhizogène produite par les vers ne serait donc pas d'origine exogène provenant du sol via le tube digestif. Les grandes similitudes d'effets observés entre, d'une part, l'acide indole acétique utilisé à différentes concentrations et, d'autre part, les excrétions ou extraits bruts de vers appliqués à différentes dilutions nous ont conduit à assimiler la substance rhizogène en question à l'acide indole acétique, phytohormone connue chez les plantes. Sa quantité approximative, exprimée en équivalent d'acide indole acétique dans les vers, serait de 18 × 103 ng/g dont la moitié (9 × 103 ng/g) serait libérée dans les seules excrétions.
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Document Type: Research Article

Publication date: 2001-11-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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