Wheat Chromatin Remodeling Protein TaSWP73 Contributes to Compatible Wheat-Powdery Mildew Interaction.

Wheat powdery mildew disease caused by the obligate biotrophic fungal pathogen () seriously threatens global wheat production. Although improved powdery mildew resistance is an aim in wheat breeding, the regulatory mechanism underlying the wheat- interaction remains poorly understood. In this study, the wheat chromatin remodeling protein TaSWP73 was identified as a negative regulator of post-penetration resistance against The transient overexpression of attenuates wheat post-penetration resistance against , while the silencing of potentiates salicylic acid (SA) biosynthesis and activates post-penetration resistance against Importantly, chromatin in the promoter regions of an activator gene of SA biosynthesis, is marked by high nucleosome occupancy in the -silenced wheat leaves. The silencing of could suppress SA biosynthesis and attenuate post-penetration resistance against with a lack of In addition, TaICS1 was characterized as an essential component of wheat SA biosynthetic machinery. Potentiated SA biosynthesis and increased post-penetration resistance against with a lack of could be suppressed by the silencing of expression. These results collectively support the hypothesis that the wheat chromatin remodeling protein TaSWP73 contributes to the compatible wheat-powdery mildew interaction presumably via the suppression of the TaSARD1-TaICS1-SA pathway.