Diallel analysis of root dry matter content in sweetpotato
Abstract
262 words
There has been much emphasis on breeding for increased
sweetpotato storage root yields, but less on the dry matter yield,
and its inheritance. High dry matter content (DMC) is associated
with consumer preferences, and is important for processing
industry. This study was conducted to determine the type of
gene action controlling DMC and to assess GxE interaction effect
on DMC in sweetpotato. Five parental clones varying in DMC
have been hand-crossed in a half-diallel design to generate 10
families. After scarification, seeds were raised in seedboxes in a
screenhouse at Namulonge, Uganda. Ten genotypes of each
family were planted in a trial at Namulonge (swamp and upland
environments) and Serere in a randomized complete block
design, with two replications, during October 2009 and March
2010. To assess DMC, 200g from each genotype was ovendried
at 650C up to constant weight. Data were analyzed using
GenStat program. General combining ability (GCA) and specific
combining ability (SCA) were computed according to model II,
Method 4 as described by Griffing (1956). Highly significant
differences were found among genotypes for DMC for all sites.
However, significant differences between families were found
only for Namulonge upland and swamp environments. Families
didn’t differ significantly in DMC for Serere site. The cross
with the highest mean in DMC was NKA x KYA, while the
genotype belongs to JEW x HUA. Understanding the type of
gene action and the effect of G x E interaction should help guide
breeding strategies for DMC in sweetpotato. The study is ongoing
and efforts are currently focused on understanding the
gene action controlling DMC.
Subjects
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