Arabidopsis flower specific defense gene expression patterns affect resistance to pathogens

Frontiers in Plant Science
Luisa EderliChris Gehring

Abstract

We investigated whether the Arabidopsis flower evolved protective measures to increase reproductive success. Firstly, analyses of available transcriptome data show that the most highly expressed transcripts in the closed sepal (stage 12) are enriched in genes with roles in responses to chemical stimuli and cellular metabolic processes. At stage 15, there is enrichment in transcripts with a role in responses to biotic stimuli. Comparative analyses between the sepal and petal in the open flower mark an over-representation of transcripts with a role in responses to stress and catalytic activity. Secondly, the content of the biotic defense-associated phytohormone salicylic acid (SA) in sepals and petals is significantly higher than in leaves. To understand whether the high levels of stress responsive transcripts and the higher SA content affect defense, wild-type plants (Col-0) and transgenic plants defective in SA accumulation (nahG) were challenged with the biotrophic fungus Golovinomyces cichoracearum, the causal agent of powdery mildew, and the necrotrophic fungus Botrytis cinerea. NahG leaves were more sensitive than those of Col-0, suggesting that in leaves SA has a role in the defense against biotrophs. In contrast, sepals a...Continue Reading

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Citations

Jul 10, 2019·International Journal of Molecular Sciences·José Erik Cruz-ValderramaAlicia Gamboa-deBuen

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Datasets Mentioned

BETA
GSE5630
GSM131498-GSM131500

Methods Mentioned

BETA
sumoylation
transgenic
light microscopy
PCR
myristoylation

Software Mentioned

Bioconductor affylmGUI package
AgriGO

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