34. コムギ藁の水浸出物に含まれる植物成長阻害物質

概要

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In general, the way of allelochemicals are released from plants to the environment is as follows : 1) exudation from roots, 2) leaching from plants by rain, 3) decomposition of residues. It is reported that the aqueous leachate of wheat straw and the extract of decomposed wheat straw inhibit the growth of several plant species. Some plant growth inhibitory phenolic acids were detected in the soil incubated with wheat straw, i.e. decomposed wheat straw. Since these studies were concentrated on the extracts of decomposed wheat straw, the information of the plant growth inhibitory substance(s) leached from the wheat straw is limited. In this study, we focused on the allelopathic potential of aqueous leachate of wheat straw and isolated and identified the plant growth inhibitory compound(s) from aqueous leachate of wheat straw. When lettuce, cress, rice and wheat were incubated with leachate of wheat straw, seedling growth, especially the root growth of lettuce and cress were inhibited. The inhibitory activity was stronger as the content of leachate of wheat straw was larger. These results suggested that allelochemical(s) inhibiting the root growth of lettuce and cress are leached from the wheat straw into the water. Two potent compounds were isolated from the leachate of wheat straw and identified as Syringoylglycerol 9-O-β-D-glu-copyranoside and L-tryptophan by spectral analyses.
植物化学調節学会の論文
2005-10-13