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Inheritance of Russian Wheat Aphid Resistance in Spring Barley
Author(s) -
Mornhinweg D. H.,
Porter D. R.,
Webster J. A.
Publication year - 1995
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1995.0011183x003500050018x
Subject(s) - biology , russian wheat aphid , hordeum vulgare , backcrossing , poaceae , aphid , aphididae , genetics , cultivar , agronomy , botany , gene , pest analysis , homoptera
The Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko), is a devastating pest of barley ( Hordeum vulgare L.). An excellent source of RWA resistance (STARS‐9301B) was recently released to the barley industry. This greenhouse study was conducted to determine the genetic control of RWA resistance in STARS‐9301B. Crosses were made between Morex, a susceptible malting barley cultivar and STARS‐9301B during 1992 and 1993. Genetic analysis was performed on the parents, F 1 , reciprocal F 1 , F 2 , and backcross (BC) populations, as well as 231 F 2 ‐derived F 3 families. Segregation in the F 2 and BC populations indicated multiple gene control. Fourteen F 3 families were found to be homozygous resistant and 16 were homozygous intermediate, indicating that two genes control RWA resistance in STARS‐9301B. Analysis of data from the F 2 and BC s to both parents suggested recessive epistasis of a dominant gene ( Dnb2 ) on an incompletely dominant gene ( Dnbl ). This type of genetic control will necessitate screening for RWA resistance after each cycle of selection in a breeding program.