Indian Society of Genetics & Plant Breeding


Near-isogenic lines in NP 4 background carrying the genes Lr1, Lr2a, Lr2c, Lr3a, Lr9, Lr10, Lr15, Lr17a and Lr20 as locally adapted differentials for Indian pathotypes of wheat leaf rust

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Wheat leaf rust differentials being used in India include
selected near-isogenic Lr lines in ‘Thatcher’ background
(set A), some of the historical differentials like Malakoff,
Webster, Loros etc. (set B) and IWP 94 (Lr23) out of a set of
eight Indian wheat genotypes (set 0). The set A lines and
most varieties in set B are late maturing as they require
long photoperiod for flowering, which limits their utilization
in virulence analysis and genetic studies under Indian
conditions. A backcross programme was conducted to
transfer those Lr genes which occur in these lines and
varieties in the background of NP 4 having desired
agronomic traits. Nine homozygous resistant lines carrying
Lr1, Lr2a, Lr2c, Lr3a, Lr9, Lr10, Lr15, Lr17a, and Lr20 have
been developed through six backcrosses and subsequent
selection based on seedling tests with appropriate leaf rust
pathotypes of selected BC6F3 lines having NP 4 plant type.
These lines being locally adapted and early maturing are
easy to maintain under Indian conditions, and can be widely
used for virulence analysis and genetic studies. 

Keywords: Near-isogenic lines, Lr genes, wheat, leaf rust differentials, Puccinia triticina, NP 4


Year: 2015
Volume: 75
Issue: 3
Article DOI: 10.5958/0975-6906.2015.00059.0
Print ISSN: 0019-5200
Online ISSN: 0975-6906


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