アレロケミカルである5穘のポリフェノールのホザキノフサモからの放出挙動とmicrocystis Aeruginosaに対する増殖抑制効果

摘要

This study was carried out to determine the rates of release of 5 polyphenolic allelochemicals, namely, (+) catechin (CAT), eugeniin (EUG), and ellagic, gallic and pyrogallic acids (EA, GA, PA, respectively), by Myriophyllum spicatum, and their growth inhibition effect on the cyanobacterium Microcystis aeruginosa. The calculated release rates were 0.040 nmol·g-wet~(-1)-h~(-1), 0.80 nmol·g-wet~(-1)·h~(-1), 1.7 nmol·g-wet~(-1)·h~(-1), 0.18 nmol·g-wet~(-1)·h~(-1), and 0.17 nmol·g-wet~(-1)·h~(-1) for CAT, EA, EUG, GA, and PA, respectively. Continuous addition of the 5 polyphenols to the cyanobacterial medium demonstrated the growth inhibition of M aeruginosa, and the observed inhibitory effect suggested that the 5 polyphenols account for the allelopathic effect of M. spicatum on M. aeruginosa by 70% at the maximum. In addition, a comparison of the release rates of the 5 polyphenols and DOC from M. spicatum indicated that about 10% of organic carbon released from M. spicatum was accounted for by these polyphenols.%水生植物と藻類，シアノバクテリアとの括抗的関係の 原因の一つとしてアレロパシーが挙げられる。これまで に，水生植物の繁茂水域の水や水生植物の栽培液 あるいは栽培液の濃縮物による藻類やシアノバクテ リアへの増殖抑制効果が確認され，藻類やシアノバクテ リアの増殖を抑制する物質（アレロパシー物質）が水生植 物から放出されることが実証されてきた。