PR1 — Oryza sativa Japonica

Summary

OsPR1 (OS07G0125600) encodes a member of the CAP (cysteine-rich secretory proteins, antigen 5, and pathogenesis-related 1) superfamily, containing a V5 allergen-like domain and a CRISP-related region. The protein is localized to the extracellular space and vacuole. In rice, OsPR1 is associated with regulation of hormone levels, cellular response to toxic substances, salicylic acid anabolism, anthocyanin anabolism, appressorium formation, hyphal growth, pigmentation, and secretion. It has been linked to grain size, grain yield, plant height, chlorophyll content (including chlorophyll a and b), and anthocyanin content. Studies of related genes in other species connect the family to defense signaling and systemic acquired resistance, though these roles are not yet established for OsPR1 itself.