Indian Society of Genetics & Plant Breeding

Gene effects of partial resistance to leaf rust (Puccinia triticina Erikss. & Henn.) in bread wheat (Triticum aestivum L. em Thell)

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Genetic basis of partial resistance to leaf rust in wheat
involving cross combination of slow rusting × susceptible
parents was investigated using generation mean analysis.
In order to examine the effect of minor genes, major genes
(Lr1, Lr10, Lr13, Lr23 and Lr26) for resistance present in
the slow rusting parents were nullified by inoculating with
virulent leaf rust races.The partial leaf rust resistance was
studied using area under disease progress curve (AUDPC)
and final disease severity (FDS). Scaling and joint scaling
tests for all the crosses indicated the importance of
additive (d), dominance (h) as well as epistatic (i, j and l)
gene effects in the inheritance of partial leaf rust resistance
based on AUDPC and FDS. Three out of four crosses
exhibited duplicate type of epistasis, whereas, additive (d)
and additive × additive (i ) interactions were significant in
most of the crosses offering good scope of selection in
early segregating generation for durable leaf rust

Keywords: Partial resistance, leaf rust, AUDPC, FDS, gene effects, wheat


Year: 2012
Volume: 72
Issue: 3
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906


Mohinder Prashar info_circle
Rajiva Kumar Agrawal and Ramesh Chand info_circle

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