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JXB Advance Access published online on July 4, 2008
Journal of Experimental Botany, doi:10.1093/jxb/ern168
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© 2008 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Microarray expression profiling of Arabidopsis thaliana L. in response to allelochemicals identified in buckwheat

Anna Golisz, Mami Sugano and Yoshiharu Fujii*

Biodiversity Division, National Institute for Agro-Environmental Sciences, 3-1-3 Kan-non-dai, Tsukuba, Ibaraki, 305-8604 Japan

* To whom correspondence should be addressed. E-mail: yfujii{at}affrc.go.jp

Buckwheat (Fagopyrum esculentum Moench) is an important annual plant cultivated for grain or as a cover crop in many countries, and it is also used for weed suppression in agro-economic systems through its release of allelochemicals. Little is known, however, concerning the mode of action of allelochemicals or plant defence response against them. Here, microarrays revealed 94, 85, and 28 genes with significantly higher expression after 6 h of exposure to the allelochemicals fagomine, gallic acid, and rutin, respectively, compared with controls. These induced genes fell into different functional categories, mainly: interaction with the environment; subcellular localization; protein with binding function or cofactor requirement; cell rescue; defence and virulence; and metabolism. Consistent with these results, plant response to allelochemicals was similar to that for pathogens (biotic stress) or herbicides (abiotic stress), which increase the concentration of reactive oxygen species (ROS; with consequent oxidative stress) in plant cells. The data indicate that allelochemicals might have relevant functions, at least in part, in the cross-talk between biotic and abiotic stress signalling because they generate ROS, which has been proposed as a key shared process between these two stress mechanisms.

Key words: Abiotic stress, allelopathy, biotic stress, fagomine, Fagopyrum esculentum Moench, gallic acid, gene expression, microarray, mode of action, rutin

Received 31 January 2008; Revised 13 May 2008 Accepted 14 May 2008


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