In plants inhibition of HPPD affects the formation of homogentisic
acid, which is a key precursor for the biosynthesis of both
tocopherols (vitamin E) and plastoquinone, a critical co-factor in
the formation of carotenoids, which protect chlorophyll in plants
from being destroyed by sunlight. If this happens,the plants turn
white without deformation due to complete loss of chlorophyll, and
the plant dies.