Epigenetic variation in Arabidopsis disease resistance

AUTOR(ES)

Stokes, Trevor L.

FONTE

Cold Spring Harbor Laboratory Press

RESUMO

Plant pathogen resistance is mediated by a large repertoire of resistance (R) genes, which are often clustered in the genome and show a high degree of genetic variation. Here, we show that an Arabidopsis thaliana R-gene cluster is also subject to epigenetic variation. We describe a heritable but metastable epigenetic variant bal that overexpresses the R-like gene At4g16890 from a gene cluster on Chromosome 4. The bal variant and Arabidopsis transgenics overexpressing the At4g16890 gene are dwarfed and constitutively activate the salicylic acid (SA)-dependent defense response pathway. Overexpression of a related R-like gene also occurs in the ssi1 (suppressor of SA insensitivity 1) background, suggesting that ssi1 is mechanistically related to bal.

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