The capacity of two maize opaque endosperm mutants (o1ando2) and two floury (fl1andfl2) to accumulate lysine in the seed in relation to their wild type counterparts Oh43+was examined. The highest total lysine content was in theo2mutant and the lowest infl1,as compared with the wild type (). For soluble lysine,o2 exhibitedover a700%increase,whilst for fl3a28%decrease was encountered, as comparedwith thewild type.