It’s thus possible that the higher FRY and HI values in some of the S1s could have resulted from non-additive gene effects, while for DMC, it’s possible that increased additive gene effects accounted for the relatively higher values in some of these S1 inbreds. This is further supported by the fact that additive variance among progeny in cross-pollinated crops increases with inbreeding because additive genetic variance is the major component of the total genetic variance (Hallauer, 1992).
It’s these outstanding S1 cassava individuals that breeders must focus on. This is one of the few reports on variation of amylose content in selfed cassava. Our study revealed considerable variation both within and between inbreds, with most of the variation within inbreds (11.8 to 34.2%). Whether or not additive or non-additive gene effects were responsible for this increase in amylose content is unknown. This is an aspect that future studies can establish, as no studies to date have been conducted on the inheritance of amylose in cassava.