Indian Society of Genetics & Plant Breeding


Association of Lr 34 gene complex with spot blotch disease resistance at molecular level in wheat (Triticum aestivum L.)

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Leaf rust and spot blotch are among most important wheat
diseases causing substantial yield losses in several parts
of the world. The studies at phenotypic level suggested
that, leaf tip necrosis (LTN) not only associated with multi
fungal resistance gene Lr34 but also confer spot blotch
resistance. This LTN – spot blotch association has not
been tested at molecular level and hardly validated in
different genetic backgrounds. A total of 87 near isogenic
lines (NILs) segregating for Lr34 gene were evaluated for
spot blotch resistance and genotyped with the molecular
markers linked to QTL QSb.bhu-7D. A set of 147 advanced
breeding lines was also evaluated for spot blotch besides
being genotyped with markers belonging to Lr34 genic
region. Out of 14 markers located on chromosome 7D, four
markers segregated in NILs. The genotypic and phenotypic
results indicated that the markers reportedly linked with
spot blotch differentiate Lr34+ and Lr34- lines and vice
versa. This supports the hypothesis that Lr34, Yr18 and
QSb.bhu-7D lies in the same gene region. Hence, the linked
markers may be used to select both for Lr34 and spot blotch
resistant lines.

Keywords: Spot blotch, Lr34, leaf tip necrosis, SSR, AUDPC


Year: 2018
Volume: 78
Issue: 3
Article DOI: 10.31742/IJGPB.78.3.11
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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