Indian Society of Genetics & Plant Breeding

Genetics of stem rust resistance in common wheat genotypes WR95 and Selection T3336

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Genetic stocks WR95 and Sel.T3336 were screened against
most prevalent races of stem rust viz., 40A, 40-1 and 117-
6 at seedling stage under controlled conditions. Both the
genetic stocks, WR95 and Sel.T3336 were found resistant
to all the three races. Genetic analysis revealed that WR95
carries a single recessive gene for rust resistance. An
effort was made to locate the gene using monosomic
series, however, the gene proved to be hemizygous
ineffective in monosomic F1s. WR95 was also screened
with validated molecular markers of the stem rust
resistance genes Sr24, Sr25, Sr26, Sr31, Sr36, and Sr38.
None of these genes could be detected in WR95 showing
that the resistance gene present in WR95 is diverse from
these genes. Sel T3336 showed segregation for one stem
rust resistance gene against race 40-1. However, screening
with molecular markers showed the presence of stem rust
resistance genes Sr24 and Sr26 in Sel.T3336. The
resistance identified in WR95 may prove very useful in
breeding.
 

Keywords: Wheat, stem rust, inheritance, molecular marker

Info

Year: 2010
Volume: 70
Issue: 2
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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