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United States Department of Agriculture

Agricultural Research Service

Title: Designating Types of Scab Resistance: a Discussion

Author
item Bushnell, William

Submitted to: National Fusarium Head Blight Forum Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: December 7, 2002
Publication Date: N/A

Technical Abstract: At a meeting of the Germplasm Introduction and Enhancement Group September 12-13, 2002, the status of terminology for types of scab resistance was reviewed and discussed. Two principal types of resistance, designated types 1 and 2, have been widely used. However, several additional types have been postulated without agreement among laboratories on either their definitions or in the sequence of numbering (or lettering) to be used. Several other factors contribute to confusion among designated types of resistance. Lively and candid discussion by the group led to the following results: about half the participants favored continued use of "type 1" to designate resistance to initial infection and "type 2" for resistance to spread in the head. The remaining participants did not favor use of type 1 or type 2 alone to designate the type of resistance. This subgroup recommended that each worker describe both what was measured and the inferred type of resistance in words instead of depending only on use of "type 1" and "type 2." For resistances other than types 1 and 2, the group was nearly unanimous that it is premature to codify them into a standardized list. Too little is known about them, methods for measuring them are not standardized, and there is lack of agreement among workers on how to designate them. The group hopes these conclusions will lead to further discussion by the larger FHB research community.

Last Modified: 11/25/2014
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