Enhancing resistance to angular leaf spot of common bean in Uganda
Abstract
177 words
Angular leaf spot (ALS) is an important disease of common
bean in Uganda. The presence of resistance sources with
narrow adaptability coupled with pathogen’s variability have
greatly undermined previous breeding efforts leading to severe
yield losses. This study seeks to identify new adapted resistance
sources within the local germplasm and pyramid the exotic
resistance sources to broaden ALS resistance. Two
Pseudocercospora griseola isolates; 1:6 and 21:7 were used
to screen 65 and 4 check genotypes. In addition, parental crosses
involving three genotypes carrying Phg 1, Phg 2 and PhgG5686A
genes were made to accumulate three resistance genes into
one genetic background. Preliminary results have indicated
that landraces U0053 and U0074 are resistant to both isolates.
Hence the two landraces offer opportunity of being used as
breeding materials for ALS resistance. However, further
screening with more virulent isolates is on-going. On the other
hand, fifteen parental crosses of Mexico 54, AND 277 and
G5686 that are involved in gene pyramiding have been done
and advanced to F1 and F2. Selection using molecular markers
for F2 progenies is planned.
Subjects
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