The evaluation of 391 spring wheat introductions for resistance to stem and leaf rust, loose smut and tan spot
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Date
2012-10-03
Authors
Claude, Pierre-Philippe
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Abstract
Three hundred ninety one (391) spring wheat introductions
from Asian, Middle Eastern and Mediteranean areas were
screened for resistance to races C17, C20, C25, C49, C53 and
C57 of Puccinia qraminis tritici; races 1, 5, 9, 15 and bulks
1, 4 and l0 of Puccinia recondita; races T2, T10, T13 and T39
of Ustilago tritici and to 6 isolates of Drechslera
tritici-repentis prevalent in western Canada.
Of the 34 introductions resistant to P. graminis tritici,
15 were genetically studied using F2 segregation data derived
from the progeny of the crosses involving resistant
introductions, their corresponding near isogenic lines and
stem rust universal suscepts. Eleven of these were found to
carry single Sr genes for resistance, notably, Sr30, Sr13 and
Sr15. Of the 70 introductions resistant to P. recondita, 28
were studied and 9 were found to carry known Lr genes for
resistance, notably Lr10 and the genes present in RL6057 and
RL6061. Twenty two introductions are believed to carry either
1 or 2 unidentified dominant, recessive, partially dominant
and/or complementary genes for resistance to either stem or
leaf rust.
Five introductions were immune and 6 highly resistant to
the 4 races of U. tritici. Sixty-nine introductions were
resistant to D. tritici-repentis . These were arbitrarily
classified into 10 'phenotypic classes' according to their
reactions to the 6 isolates used.
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Keywords
stem rust, leaf rust, loose smut, tan rust, wheat, resistance