Abstract
The inheritance of resistance in sweetclover, Melilotus officinalis (L.) Lam., to the sweetclover aphid, Therioaphis riehmi (Borner), was studied by using mass infestation and confinement of aphids to measure resistance. Classification of F1, F2, and backcross progenies revealed that resistance was a dominant characteristic and that a single pair of alleles was segregating in most of the progenies observed. An additional pair of genes that acted in a complementary manner appeared to be involved in several progenies derived from I resistant parent.
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