INHERITANCE OF PARTIAL RESISTANCE TO BEAN RUST IN THE COMMON BEAN (PHASEOLUS-VULGARIS L)

The inheritance of partial resistance within eight bean cultivars to a single-pustule isolate of bean rust was studied by means of a F-1 dia llel test. General combining ability (GCA) and specific combining abil ity (SCA) were very highly significant over two seasons and in interac tion with seasons. The partitioning of the sums of squares indicated t he greater importance of GCA in the inheritance of the resistance. Rec iprocal effects were not significant. The estimates of narrow-sense he ritability in the two seasons were 0.899 +/- 0.056 and 0.603 +/- 0.065 .