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Title: Determining Inheritance of Resistance To Russian Wheat Aphid In Bread Wheat
Authors: Kenduiwa, Kipkoech Julius
Keywords: Russian Wheat Inheritance of Resistance Bread Wheat
Issue Date: Jul-2009
Publisher: Egerton University
Abstract: The Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko) leads to extensive economic damage to wheat (T riticum aestivum L.) and barley (Hordeum vulgare L.) in Kenya This pest first appeared in Kenya in 1995. Pesticide control of Russian wheat aphid (RWA) is difficult because severe infestation makes the leaves to tightly roll protecting the aphid from contact insecticides, while the use of systemic insecticides is expensive. The most effective method of RWA control is, therefore, the development of RWA resistant cultivars. Breeding of RWA resistant cultivars is further complicated due to presence of RWA biotypes. There are at least eight known biotypes worldwide. Genetic information is necessary to effectively develop adapted resimnt cultivars. This study was initiated to determine inheritance of resistance of selected bread wheat culfivars to RWA Inheritance of RWA resistance and allelic relationships among three sources of resistance was studied in parents, FL F; and backcross populations of wheat crosses involving three resistant (RWAPC9, RWAPC16 and KM21/RWAPC16) and one susceptible (Kwale) cultivars at Njoro, Kenya‘ Seedlings were infested at one leaf stage with five fourth-instar Russian wheat aphids at the base of the plant and were scored for damage on a visual scale of 1 to 9 afier l4 days of infestation. The segregation data from three crosses between the resisant and susceptible cultivars indicated that RWA resistance was inherited as monogenic dominant trait (3R:lS in F2 and lR:lS in backcross). Segregation data (l5R:1S) from crosses among three resistant cultivars indicated that two non-allelic loci were involved in the expression of resistance to Russian wheat aphid. No reciprocal difference was detected in any cross studied. It was recommended that two resistance genes should be transferred through backcross breeding into locally adapted susceptible cultivars. Pyramiding of two independent resistance genes could enhance the resistance in the adapted cultivars.
Appears in Collections:Faculty of Agriculture

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