The gene avhppd-03 decodes the enzyme AvHPPD-03 which catalyses the
formation of homogentisic acid, the aromatic precursor of
plastoquinone and vitamin E biosynthesis . It has a low binding
afinity for mesotrione, a herbicide that inhibits HHPD. Expression
of AvHPPD-03 in plant cells confers tolerance to HPPD inhibitor
herbicides such as mesotrione.