Pathogen-induced systemic plant signal triggers DNA rearrangements

Igor Kovalchuk (), Olga Kovalchuk, Véronique Kalck, Vitaly Boyko, Jody Filkowski, Manfred Heinlein and Barbara Hohn
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Igor Kovalchuk: University of Lethbridge
Olga Kovalchuk: University of Lethbridge
Véronique Kalck: Friedrich Miescher-Institut for Biomedical Research
Vitaly Boyko: Friedrich Miescher-Institut for Biomedical Research
Jody Filkowski: University of Lethbridge
Manfred Heinlein: Friedrich Miescher-Institut for Biomedical Research
Barbara Hohn: Friedrich Miescher-Institut for Biomedical Research

Nature, 2003, vol. 423, issue 6941, 760-762

Abstract: Abstract Plant genome stability is known to be affected by various abiotic environmental conditions1,2,3,4,5,6,7, but little is known about the effect of pathogens. For example, exposure of maize plants to barley stripe mosaic virus seems to activate transposable elements8,9 and to cause mutations in the non-infected progeny of infected plants10. The induction by barley stripe mosaic virus of an inherited effect may mean that the virus has a non-cell-autonomous influence on genome stability. Infection with Peronospora parasitica results in an increase in the frequency of somatic recombination in Arabidopsis thaliana11; however, it is unclear whether effects on recombination require the presence of the pathogen or represent a systemic plant response. It is also not clear whether the changes in the frequency of somatic recombination can be inherited. Here we report a threefold increase in homologous recombination frequency in both infected and non-infected tissue of tobacco plants infected with either tobacco mosaic virus12 or oilseed rape mosaic virus13. These results indicate the existence of a systemic recombination signal that also results in an increased frequency of meiotic and/or inherited late somatic recombination.

Date: 2003
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DOI: 10.1038/nature01683

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