May interact with bacterial adhesins thereby protecting the reproductive tissues from microbial attack. Has no oxalate oxidase activity (By similarity). 2 H(+) + 2 superoxide = H2O2 + O2 Binds 1 Mn(2+) ion per monomer. Highly thermostable. Monomer. In the absence of manganese, it forms tetrameric and pentameric forms which show superoxide dismutase activity (By similarity). Secreted in the nectar. Glycosylated. Belongs to the germin family.