The 2NS Translocation fromAegilops ventricosaConfers Resistance to theTriticumPathotype ofMagnaporthe oryzae.
Wheat blast is a serious disease caused by the fungusMagnaporthe oryzae(Triticumpathotype) (MoT). The objective of this study was to determine the effect of the 2NS translocation fromAegilops ventricosa(Zhuk.) Chennav on wheat head and leaf blast resistance. Disease phenotyping experiments were conducted in growth chamber, greenhouse, and field environments. Among 418 cultivars of wheat (Triticum aestivumL.), those with 2NS had 50.4 to 72.3% less head blast than those without 2NS when inoculated with an older MoT isolate under growth chamber conditions. When inoculated with recently collected isolates, cultivars with 2NS had 64.0 to 80.5% less head blast. Under greenhouse conditions when lines were inoculated with an older MoT isolate, those with 2NS had a significant head blast reduction. With newer isolates, not all lines with 2NS showed a significant reduction in head blast, suggesting that the genetic background and/or environment may influence the expression of any resistance conferred by 2NS. However, when near-isogenic lines (NILs) with and without 2NS were planted in the field, there was strong evidence that 2NS conferred resistance to head blast. Results from foliar inoculations suggest that the resistance to head infection that is imparted by the 2NS translocation does not confer resistance to foliar disease. In conclusion, the 2NS translocation was associated with significant reductions in head blast in both spring and winter wheat.
Dep. of Plant Pathology, Kansas State Univ., 1712 Claflin Rd., Manhattan, KS 66506.
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Cruz
USDA-ARS, Fort Detrick, MD 21702.
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Peterson
Dep. of Plant Pathology, Kansas State Univ., 1712 Claflin Rd., Manhattan, KS 66506.
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Bockus
Dep. of Plant Pathology, Kansas State Univ., 1712 Claflin Rd., Manhattan, KS 66506.
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Kankanala
Howard Hughes Medical Institute, Chevy Chase, MD 20815.
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Dubcovsky
Dep. of Plant Pathology, Kansas State Univ., 1712 Claflin Rd., Manhattan, KS 66506.
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Jordan
Dep. of Plant Pathology, Kansas State Univ., 1712 Claflin Rd., Manhattan, KS 66506.
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Akhunov
Dep. of Plant Pathology, Kansas State Univ., 1712 Claflin Rd., Manhattan, KS 66506.
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Chumley
Asociación Nacional de Productores de Oleaginosas y Trigo, Av. Ovidio Barbery esq. Jaime Mendoza, Santa Cruz de la Sierra, Bolivia.
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Baldelomar
Dep. of Plant Pathology, Kansas State Univ., 1712 Claflin Rd., Manhattan, KS 66506.
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Valent