Indian Society of Genetics & Plant Breeding

Mapping of genes for leaf and stem rust resistance in bread wheat genotype Selection 212

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Resistance genes for leaf and stem rusts in bread wheat
line Selection212 are recessive in nature. Both leaf and stem
rust resistance genes, named tentatively as LrSel212 and
SrSel212, have been mapped to the short arm of
chromosome 2B separated by genetic distance of 16.4 cM.
Xwmc474 was the closest marker located between two
genes, 5.6 cM proximal to LrSel212 and 10.8 cM distal to
SrSel212. Leaf rust pathotype 77-5 is virulent to leaf rust
resistance genes located on chromosome 2B viz., Lr13,
Lr16, Lr23, Lr35 and Lr73, but avirulent to Selection212,
suggesting that LrSel212 is distinct from these genes. Six
stem rust resistance genes have been assigned to
chromosome 2B viz., Sr19, Sr20, Sr23, Sr36, Sr39 and Sr40.
Stem rust pathotype 40A used in genetic analysis was
virulent to Sr19 and Sr20, but avirulent to Selection212; and
the latter showed a significantly lower infection type in
comparison to Sr39. Sr23 and Sr36 showed susceptibility
to few other stem rust pathotypes to which Selection212
was resistant. While the response of Sr40 to Indian
pathotypes of Pgt is not known, differences in the genetic
distance and nature of inheritance between Selection212
and Sr40 indicate their distinct identity. However, test of
allelism with Sr40 is required to confirm whether SrSel212
represents a different locus. Selection212 may be useful in
broadening the genetic base of rust resistance in wheat.

Keywords: Wheat (Triticum aestivum), leaf rust, stem rust, double inoculation, recessive class analysis, molecular mapping


Year: 2019
Volume: 79
Issue: 1
Article DOI: 10.31742/IJGPB.79.1.1
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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