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Title: Categories and inheritance of resistance to Russian wheat aphid (Homoptera: Aphididae) biotype 2 in a selection from wheat cereal introduction 2401

Author
item VOOTHULURU, PRIYAMVADA - KANSAS STATE UNIVERSITY
item MENG, JIANYE - KANSAS STATE UNIVERSITY
item KHAJURIA, CHITVAN - KANSAS STATE UNIVERSITY
item LOUIS, JOE - KANSAS STATE UNIVERSITY
item ZHU, LIECENG - KANSAS STATE UNIVERSITY
item STARKEY, SHARON - KANSAS STATE UNIVERSITY
item WILDE, GERALD - KANSAS STATE UNIVERSITY
item Baker, Cheryl
item SMITH, C. MICHAEL - KANSAS STATE UNIVERSITY

Submitted to: Journal of Economic Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/7/2006
Publication Date: 10/1/2006
Citation: Voothuluru, P., Meng, J., Khajuria, C., Louis, J., Zhu, L., Starkey, S., Wilde, G.E., Baker, C.A., Smith, C. 2006. Categories and inheritance of resistance to Russian wheat aphid (Homoptera: Aphididae) biotype 2 in a selection from wheat cereal introduction 2401. Journal of Economic Entomology. 99(5):1854-1861.

Interpretive Summary: The Russian wheat aphid is one of the most devastating pests of wheat and barley in the world. Growing wheat and barley that is genetically resistant to this pest is an ecologically, economically, and biologically sound method of controlling losses due to this pest. Unfortunately, a new biotype of this aphid has arisen that is able to overcome the resistance in currently available wheat varieties. Therefore, there is an immediate need to identify and characterize additional sources of resistance to this pest. In this article we report that resistance to this new Russian wheat aphid biotype, identified in a selection from wheat cereal introduction (CItr) 2401, is controlled by two dominant genes. This plant resistance is due to a strong level of antibiosis that affects aphid population growth, combined with a tolerance to aphid feeding.

Technical Abstract: The Russian wheat aphid, Diuraphis noxia (Kurdjumov) (Homoptera: Aphididae), is one of the most devastating insect pests of wheat (Triticum spp.) and barley (Hordeum spp.) in the world. Yield losses and control costs are valued at several hundred million dollars each year. The use of D. noxia-resistant cultivars is an ecologically, economically, and biologically sound method of managing this pest. Several D. noxia resistance (Dn) genes from wheat have been used to develop cultivars resistant to D. noxia. However, a new U.S. D. noxia biotype (biotype 2) in Colorado is virulent to all known Dn genes except the Dn7 gene from rye (Secale spp.). Hence, there is an immediate need to identify and characterize unique sources of D. noxia resistance to biotypes. In this article, we report resistance to D. noxia biotype 2, identified in a selection from wheat cereal introduction (CItr) 2401, that is controlled by two dominant genes. CItr2401 has a strong antibiosis effect that is exhibited as a reduced intrinsic rate if increase of D. noxia biotype 2. CItr2401 plants also exhibit tolerance to leaf rolling and chlorosis. No antixenosis was detected in CItr2401.