Using polygenic resistance to breed for stem rust resistance in wheat. Chapter 4.
1988
Knott D.R.
Multigenic resistance to stem rusts has been known for many years. Non-specific resistance to disease has been hypothesized but it is difficult to prove. Partial resistance and slow rusting are often controlled by several genes having small effects and are sometimes thought to be non-specific. In studies at Saskatoon, lines of wheat were developed that lacked seedling resistance to race 15B-1 but had good field resistance to the same race. Their resistance proved to be controlled by three to five recessive genes, each having a small effect. The genes reduced the latent period and pustule number and size. Resistance that is controlled by several genes having small effects is likely to be relatively durable, regardless of wether it is specific or non-specific. Polygenic resistance is difficult to use in wheat breeding programs but its use could be very worthwhile.
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