Enhancing genetic resistance to soybean rust disease
Abstract
180 words
Soybean is an important crop worldwide with unrivalled protein
quality and content. Sustenance of soybean productivity is,
however, compromised by the devastating soybean rust disease
caused by the fungus Phakopsora pachyrhizi. Some resistant
genotypes have been identified in exotic germplasm that can
be utilised in enhancing genetic resistance of the locally adapted
varieties. Thus this study seeks to utilise exotic and farmer
preferred varieties to formulate breeding programme for
resistance to soybean rust. The study is also using marker
assisted selection to introgress selected specific resistance genes
into one genetic background. Preliminary results show
characteristic resistance phenotypic responses for the crosses
involving exotic parents with single gene resistance. Field
evaluation of F2 and F3 progenies respectively will give conclusive
results on the resistance breeding values of the selected parental
materials during the forthcoming two seasons (September -
December 2010) and (March - June 2011). Preliminary results
on gene pyramiding have identified makers Satt620 (Rpp2),
Sat460 (Rpp3) & Satt288 (Rpp4) as being polymorphic and
usable for marker assisted selection. Selection using these
polymorphic markers on the F2 progenies will begin shortly.
Subjects
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