著者

Mushtaq Muhammad Naeem 春原 由香里 松本 宏

出版者

日本農薬学会

雑誌

日本農薬学会誌(Journal of Pesticide Science) (ISSN:1348589X)

巻号頁・発行日

vol.38, no.2, pp.68-73, 2013

被引用文献数

11

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<span style="font-variant: small-caps;">l</span>-DOPA (<span style="font-variant: small-caps;">l</span>-3,4-dihydroxyphenylalanine) is a bioactive secondary metabolite which inhibits growth of many weed species. However, its mode of action is not well elucidated in plants. The present studies were conducted to evaluate the effect of <span style="font-variant: small-caps;">l</span>-DOPA on root growth of cucumber (<i>Cucumis sativus</i> L.) and the possible involvement of quinoproteins (quinone-incorporated proteins) in phytotoxicity of <span style="font-variant: small-caps;">l</span>-DOPA. The results revealed that <span style="font-variant: small-caps;">l</span>-DOPA significantly inhibited root growth, induced cell death, increased polyphenol oxidase (PPO) activity, reduced free cysteine content, and enhanced quinoprotein formation in cucumber roots. The decrease in free cysteine content and increase in PPO activity suggested that quinones covalently bind with cysteine to form quinoproteins. The quinoproteins may be involved in phytotoxic action of <span style="font-variant: small-caps;">l</span>-DOPA in cucumber roots.