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Direct fungicidal activities of C6-aldehydes are important constituents for defense responses in Arabidopsis against Botrytis cinerea.

Abstract：

:C6-aldehydes, such as (Z)-3-hexenal, (E)-2-hexenal, and n-hexanal, are volatile compounds formed by hydroperoxide lyase (HPL) and found in most terrestrial plants. They are fungicidal and bactericidal compounds, and are also signaling compounds to induce defense responses in plants. Transgenic plants having overexpressed or suppressed HPL activity (SH or ASH, respectively) showed lower or higher susceptibility against a necrotrophic fungal pathogen, Botrytis cinerea. In this study, we examined whether the modulated susceptibility was accountable to the direct fungicidal activity or to the signaling potency of C6-aldehydes. When wild-type Arabidopsis leaves were inoculated with B. cinerea, HPL expression was upregulated, and concomitantly, the amounts of C6-aldehydes increased. Higher amounts of C6-aldehydes found in inoculated SH plants inhibited growth of B. cinerea in vitro, while lower amounts found in ASH plants caused no inhibitory effect on the fungi. Thus, it was suggested that direct fungicidal activity of C6-aldehydes accounted for the modulated susceptibility. With SH plants higher amounts of camalexin could be found, but with the ASH plants no difference from wild-type plants could be found. Surplus amounts of C6-aldehydes could induce formation of camalexin as signaling compounds; however, this was not the case with wild-type and ASH plants. Accordingly, it could be assumed that direct fungicidal activity of C6-aldehydes were prominently responsible to the defense against B. cinerea but their signaling roles could be little responsible if any.

journal_name

Phytochemistry

journal_title

Phytochemistry

authors

Kishimoto K,Matsui K,Ozawa R,Takabayashi J

doi

10.1016/j.phytochem.2008.04.023

subject

Has Abstract

pub_date

2008-08-01 00:00:00

pages

2127-32

issue

11

eissn

0031-9422

issn

1873-3700

pii

S0031-9422(08)00219-7

journal_volume

69

pub_type

杂志文章

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