Development of Fusarium Root Rot Resistant Ideotypes in Common Bean
Abstract
170 words
The study is aiming at developing a superior breeding parent
for Fusarium root rot resistance through pyramiding non-allelic
resistance genes from five different parents. The rationale is
to accumulate and fix resistance quantitative trait loci/genes
from different sources of resistance into a single genetic
background called Fusarium root resistant ideotype. Such
ideotypes could be used either directly as improved cultivars or
as sources of resistance to improve susceptible market-class
varieties. Single-crosses (SC) were developed, evaluated at F2
and resistant segregants selected. Selected segregants were
used to develop double-cross (DC) populations, which were
evaluated at the F3 and the resistant plants selected. The
harvested DC F4 seeds from selected DC F3 plants will be
evaluated and resistant segregants selected. Selected plants
will be used in a backcross procedure to fix the accumulated
quantitative trait loci/genes. Preliminary results from the
evaluations of SC F2 and DC F3 showed that both SC F2 and
DC F3 segregated for highly resistant genotypes suggestive of
the effect of cumulated resistance genes from the multiple
parents.
Subjects
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