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Inheritance of a Second Source of Greenbug Resistance in Barley¹

Genetic studies were conducted to determine the inheritance of resistance to biotype E greenbug, Schizaphis graminum (Rondani), in PI 426756, a barley (Hordeum vulgare L.) line previously identified as resistant to this pest. An additional objective was to determine whether the genes governing resistance in PI 426756 and ‘Post’ are allelic or nonallelic. Results from greenbug-infested F₂ and F₃ seedlings in the greenhouse indicated that the resistance in each line is governed by a single dominant gene, and that these two genes are nonallelic and independent. The discovery of another gene for greenbug resistance is important because greenbug resistance in all current U.S. commercial barley cultivars appears to trace back to the same single dominant gene present in Post. The gene symbol Rsg2b was assigned to this gene; whereas, the gene symbol formerly designated Grb was modified to Rsg1a.

Key Words: Schizaphis graminum (Rondani) • Hordeum vulgare L. • Barley genetics

² Research agronomist and research entomologist, USDA-ARS, Plant Science and Water Conservation Lab., P.O. Box 1029, Stillwater, OK 74076; and senior agriculturist, Agronomy Dep., Oklahoma State Univ., Stillwater, OK 74078, respectively.

Received for publication June 27, 1986.

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				D. R. Porter and D. W. Mornhinweg New Sources of Resistance to Greenbug in Barley Crop Sci., July 1, 2004; 44(4): 1245 - 1247. [Abstract] [Full Text] [PDF]