Catalyzes the conversion of the long chain elongated methionines penta- and hexahomomethionine to their corresponding aldoximes 8-methylthiooctanaldoxime and 9-methylthiononanaldoxime. L-hexahomomethionine + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = (E)-9-(methylsulfanyl)nonanal oxime + CO2 + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] L-pentahomomethionine + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = (E)-8-(methylsulfanyl)octanal oxime + CO2 + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] an L-polyhomomethionine + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = an (E)-omega-(methylsulfanyl)-alkanal oxime + CO2 + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] Highly expressed in hypocotyl and roots. Lower expression in siliques, stems and leaves. Barely detectable in flowers. Expressed only in the vascular bundles in apical plant parts. Expressed above the root elongation zone, but not in the root primordium. By methyl jasmonate. Plants show a slight lateral root growth reduction. Belongs to the cytochrome P450 family.