<i>Erwinia</i>属軟腐病菌のペクチンリアーゼ誘導物質として考えられるDNA損傷物質の植物体内における存在

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  • Presence of DNA damaging agents in plants as the possible inducers of pectin lyases of soft-rot Erwinia.
  • Erwinia属軟腐病菌のペクチンリアーゼ誘導物質として考えられるDNA損傷物質の植物体内における存在〔英文〕
  • Erwiniaゾク ナンプビョウキン ノ ペクチンリアーゼ ユウドウ ブッシツ

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When the strains of E. chrysanthemi and E. carotovora subsp. carotovora were inoculated onto potato or radish disks, the activity of pectin lyase reached the same order as that of pectate lyase in some combination of the pathogen and plant. When time-course samples were taken after the addition of the extract of radish into the culture of E. chrysanthemi (EC183), the specific activities of both pectate lyase and pectin lyase were consistently elevated. The specific activities of both enzymes were also elevated, when E. chrysanthemi (ALE8292P) was grown in the medium containing the ethanol extract from 12 different plants. Thus, some compound responsible for the induction of these enzymes seem to be commonly present in plants. Ten out of these 12 ethanol extracts from plants inhibited the growth of rec- strain more severely than that of rec+ strain of Bacillus subtilis (rec assay). Therefore, DNA damaging agents also seem to be commonly present in plants. Since the induction of pectin lyase in soft-rot Erwinia has been shown to occur only by DNA-damaging agents, these DNA damaging agents found in plants may be responsible for the induction of pectin lyase at the infection site.

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