In:
New Phytologist, Wiley, Vol. 221, No. 2 ( 2019-01), p. 1023-1035
Kurzfassung:
DNA methylation is dynamically involved in plant immunity, but little information is known about its roles in plant interactions with biotrophic fungi, especially in temperate grasses such as wheat ( Triticum aestivum ). Using wheat diploid progenitor Aegilops tauschii accession AL 8/78, the genome of which has been sequenced, we assessed the extent of DNA methylation in response to infection with Blumeria graminis f. sp. tritici ( Bgt ), which causes powdery mildew. Upon Bgt infection, ARGONAUTE 4a ( AGO 4a ) was significantly downregulated in A. tauschii , which was accompanied by a substantial reduction in AGO 4a‐sorted 24‐nt si RNA levels, especially for genes near transposable elements ( TAG s). Bisulfite sequencing revealed abundant differentially methylated regions ( DMR s) with CHH hypomethylation. TAG s bearing CHH ‐hypomethylated DMR s were enriched for ‘response to stress’ functions, including receptor kinase, peroxidase, and pathogenesis‐related genes. Virus‐induced gene silencing ( VIGS ) of a DOMAINS REARRANGED METHYLASE 2 ( DRM 2 ) homolog enhanced plant resistance to Bgt . The effect of CHH hypomethylation was exemplified by the upregulation of a pathogenesis‐related β‐1,3‐glucanse gene implicated in Bgt defense. These findings support the idea that dynamic DNA methylation represents a regulatory layer in the complex mechanism of plant immunity, which could be exploited to improve disease resistance in common wheat.
Materialart:
Online-Ressource
ISSN:
0028-646X
,
1469-8137
DOI:
10.1111/nph.2019.221.issue-2
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2019
ZDB Id:
208885-X
ZDB Id:
1472194-6