O-DIPHENOL OXIDASE INHIBITION - AN ADDITIONAL ROLE FOR OXALIC-ACID IN THE PHYTOPATHOGENIC ARSENAL OF SCLEROTINIA-SCLEROTIORUM AND SCLEROTIUM-ROLFSII

被引：51

作者：

FERRAR, PH ^{[1
]}

WALKER, JRL ^{[1
]}

机构：

[1] UNIV CANTERBURY, DEPT PLANT & MICROBIAL SCI, CHRISTCHURCH 1, NEW ZEALAND

来源：

PHYSIOLOGICAL AND MOLECULAR PLANT PATHOLOGY | 1993年 / 43卷 / 06期

关键词：

O-DPO; o-diphenol oxidase; OA; oxalic acid;

D O I：

10.1006/pmpp.1993.1069

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Oxalic acid secreted by the phytopathogens Sclerotinia sclerotiorum and Sclerotium rolfsii and its effect on o-diphenol oxidase activity in infected apples and dwarf bean pods respectively has been investigated. Concentrations of oxalic acid in culture filtrates and in infected tissues were determined. Oxalic acid was found to suppress enzymic browning in apples by mixed-competitive inhibition of the o-diphenol oxidase. By contrast, in bean pods the secreted oxalic acid reduced the pH to a level where o-diphenol oxidase was inactive. It is postulated that this action enhances the pathogen’s success by suppressing the host’s defence mechanisms. © 1993 Academic Press, Inc.

引用

页码：415 / 422

页数：8

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