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Inheritance of Russian Wheat Aphid Resistance in Spring Barley

Mornhinweg, D. H., Porter, D. R., Webster, J. A.
Crop science 1995 v.35 no.5 pp. 1368-1371
Hordeum vulgare, pest resistance, Diuraphis noxia, genetic resistance, lines, cultivars, genetic techniques and protocols, genes, epistasis, inheritance (genetics), varietal resistance
The Russian wheat aphid (RWA), (Mordvilko), is a devastating pest of barley (L.). An excellent source of RWA resistance (STARS-93016) was recently released to the barley industry. This greenhouse study was conducted to determine the genetic control of RWA resistance in STARS-93018. Crosses were made between Morex, a susceptible malting barley cultivar and STARS-93016 during 1992 and 1993. Genetic analysis was performed on the parents, F, reciprocal F, F, and backcross (BC) populations, as well as 231 F-derived F families. Segregation in the F and BC populations indicated multiple gene control. Fourteen F families were found to be homozygous resistant and 16 were homozygous intermediate, indicating that two genes control RWA resistance in STARS-93016. Analysis of data from the F and BC to both parents suggested recessive epistasis of a dominant gene () on an incompletely dominant gene (). This type of genetic control will necessitate screening for RWA resistance after each cycle of selection in a breeding program.