Combining Ability for Resistance to Soybean Rust in F2 and F3 Soybean Populations
Abstract
162 words
Combining ability for soybean rust resistance was estimated
from a half diallel cross of eight soybean lines using disease
severity and sporulation rates as indices for resistance. A
consistent contribution of additive gene action was observed at
MUARIK in Uganda across F2 and F3 despite high environment
contribution to both severity and sporulation rate. The
simultaneous evaluation of F3 populations in five diverse locations
produced similar results with significant GCA effects for both
traits. There were, however, greater genotypic effects to
soybean rust severity and sporulation across the five test
environments, although severity and sporulation rate genetic
systems acted independently. Additive and additive x additive
epistatic gene effects were the most common form of GCA
controlling resistance. Specific combining ability did not always
contribute to soybean rust resistance. Parental line UG 5 was
the most outstanding producing the greatest number of resistant
populations. This study underscores the importance of additive
gene effects in the control of soybean rust severity and
sporulation rate.
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