Negative regulator of cell death and defense responses. Exhibits calcium-dependent phospholipid binding properties (By similarity). Interacts with BON1, BON2 and BON3. Expressed in roots, leaves, stems and flowers. Down-regulated by high temperature. Up-regulated by salicylic acid, AgNO(3), chitin, cycloheximide, ozone, syringolin, salt stress and upon pathogen or nematode infection. No visible phenotype, but accelerated hypersensitive response (HR). Bap1 and bap2 double mutant is seedling lethal. Overexpression of BAP2 can suppress defects in bap1 mutants.