Secreted effector that suppresses pathogen-associated molecular pattern (PAMP)-triggered immunity (PTI) in host plants (PubMed:22072967, PubMed:30156022). Binds to RCD1 and SRO1 transcription co-regulators to attenuate transcriptional activation of salicylic acid (SA)-induced defense genes and alters plant growth responses to light (PubMed:30156022). Suppresses SA signal transduction but not SA levels (PubMed:30156022). Interacts with host RCD1 and SRO1 transcription co-regulators. Co-opts the host cell's nuclear import system via its bipartite nuclear localization signal. Has the canonical translocation RxLR motif, but lacks the canonical EER motif, which characterizes most oomycete effectors identified so far. The C-terminal 58 amino acids (residues 228-285) are required for RCD1-binding and attenuation of light and defense signaling. Belongs to the RxLR effector family.