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EVIDENCE OF ISOLATE-SPECIFICITY
IN NON-HYPERSENSITIVE RESISTANCE IN SPRING WHEAT (TRITICUM AESTIVUM)
TO WHEAT LEAF RUST
MAQSOOD
QAMAR*
AND
R.E. NIKS**
Abstract:
Isolate-specific aspect of non-hypersensitive
resistance in wheat to wheat leaf rust was studied at seedling stage in
the green house. Isolate-specific response of non-hypersensitive
resistance was assessed from latency period (LP) and infection frequency
(IF) of two single-pustule isolates of Puccinia
triticina in 26 spring wheat cultivars/lines. Small but significant
cultivar x isolate interactions were observed for LP and IF in seedlings
of host genotypes. Isolate specific effect for LP at seedling stage was
consistent and reproduced in a repeated experiment; however, the
interaction for IF was inconsistent and was not reproducible. The
inconsistency in cultivar x isolate interaction may be due to some
non-genetic origin. The result suggested that a gene-for-gene
relationship could exist between non-hypersensitive resistance genes in
the host and genes in pathogen.
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