At3g22200: POP2 (POLLEN-PISTIL INCOMPATIBILITY 2)
Genetically redundant with POP3,mediates pollen tube guidance. Double mutants are self sterile, gamma-aminobutyrate transaminase subunit precursor, nuclear gene for mitochondrial product. Encodes gamma-aminobutyrate transaminase that uses pyruvate instead of alpha-ketoglutarate as cosubstrate. Mutations in POP2/HER1 render roots resistant to the inhibitory growth effects of the volatile organic compound E-2-hexenal implicated in plant defense.