Japanese Journal of Phytopathology
Online ISSN : 1882-0484
Print ISSN : 0031-9473
ISSN-L : 0031-9473
Regulation of Pisatin Biosynthesis in Pea Leaves by Elicitor and Suppressor Produced by Mycosphaerella pinodes
Motohiro HIRAMATSUYuki ICHINOSETomonori SHIRAISHIHachiro OKUSeiji OUCHI
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1986 Volume 52 Issue 1 Pages 53-58

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Abstract

Regulation of pisatin biosynthesis in naked mesophyll tissue of pea leaves by suppressor (F5) and elicitor isolated from Mycosphaerella pinodes was studied using a radioactive precursor of pisatin synthesis, 14C-phenylalanine. Incorporation of radioactivity became detectable 4.5-6 hr after elicitor treatment and increased thereafter. Concomitant presence of F5 inhibited the pisatin inducing activity of the elicitor completely. Treatment of pea leaves with F5 after elicitor-activation caused a reduction of pisatin synthesis and an increased accumulation of cinnamic acid, an intermediate of pisatin synthesis. F5 was found to inhibit in vitro the activity of phenylalanine ammonia-lyase and cinnamate 4-hydroxylase. The suppressing ability of F5 on pisatin synthesis seemed to be reversible.

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© The Phytopathological Society of Japan
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