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Untersuchungen Über Die Eigenschaften Der Auf Heterodera Schachtii Schmidt Aktivierend Wirkenden Wurzelexsudate Von Brassica Rapa Oleifera D.C

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By culturing seedling-plants of turnip rape [Brassica rapa oleifera] in destilled water, root-exudates were collected and investigated for their activity to stimulate hatching of encysted larvae of Heterodera schachtii. It was established that the active principle of the exudates can be partially destroyed by various physical and chemical means as well as by bacterial degradation. Total loss of the active principle can only be achieved by rather complete destruction of the organic material contained in the root-exudates. The active principle is dialysable and is retained by ionic exchange resins in a varying degree depending on the nature of the resin. Careful concentration of the exudates to dryness in vacuo at 35°C does not appreciably affect the activity of the material. Paper electrophoresis of the root-exudates shows that the active principle can be separated into various, in part polar, compounds. The active components can also be separated by means of paperchromatography. The relative position of the compounds in question on the paper chromatogram gives some indication on the probable nature of these substances. A very distinct zone of activity on the paper can be obtained by using s-Butanol : Formic-acid : Water (75 : 13 : 12) as a solvent system, in which the component with the highest activity migrates with a Rf-value of appr. 0.8. It was not yet possible to find a colour reaction for the most active component on the paper. This indicates that the concentration of the most active component on the paper was still to low or that the component in question does not react with any of the staining reagents tested. Further experiments showed however, that the most active substance can not only be found in root-exudates but also, and in much higher concentration, in the roots of young seedlings from which it can be extracted without difficulty. With the technics already applied, further analytical investigations of the hatching factors in Brassica rapa seem to be promising.

Affiliations: 1: Institut für Pflanzenpathologie der Universität Göttingen und Institut für Zucker-rübenforschung, Göttingen, Deutschland


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