Agriculture Reference
In-Depth Information
closely related species. Each of these resistance
genes has provided protection for a very small
subset of specifi c biotypes of aphids or Hessian
fl y. Consequently, multiple resistance genes are
needed to provide broad-spectrum protection
across multiple biotypes of pests that typically
constitute fi eld populations. The advent of
molecular markers associated with these resis-
tance genes will now allow breeders to more
effectively combine genes to provide protection
against pest populations with known biotypic
composition.
Success in wheat resistance to insect pests has
typically been short-lived due to the tremendous
inherent genetic diversity for virulence within
pest populations. Sources of durable resistance
may have to come from unrelated species of wheat
via genetic transformation.
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