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Differentiating greenbug resistance genes in barley

Permanent URL:
http://handle.nal.usda.gov/10113/2328
File:
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Abstract:
The greenbug [Schizaphis graminum (Rondani)] is an extremely damaging pest of barley (Hordeum vulgare L), particularly in the southern Great Plains of the USA. Two greenbug resistance genes, Rsg1a (in 'Post 90') and Rsg2b (in PI 426756), available for developing resistant barley cultivars, have similar phenotypes when challenged by various greenbug biotypes. This study was conducted to separate these two resistance genes via differential plant reactions to a recently collected field isolate of greenbug. Four barley entries and one wheat germplasm were challenged with two greenbug isolates and damage ratings were recorded for each combination. One greenbug isolate used in this study (TX1) was able to differentiate Rsg1a from Rsg2b through dramatically different plant responses (Rsg2b conferred resistance, Rsg1a did not). The results indicate the potential vulnerability of greenbug resistance genes in barley. Based on these and other reported results, we propose that gene symbol designations for greenbug resistance in barley be changed from Rsg1a to Rsg1 and Rsg2b to Rsg2.
Author(s):
Porter, D.R. , Burd, J.D. , Mornhinweg, D.W.
Subject(s):
Hordeum vulgare , barley , genes , pest resistance , Schizaphis graminum , insect pests , crop damage , biotypes
Format:
p. 11-14.
Note:
Includes references
Source:
Euphytica 2007 Jan., v. 153, no. 1-2
Language:
English
Year:
2007
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.