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Effect of Russian Wheat Aphid on Wheat Root and Shoot Development in Resistant and Susceptible Genotypes

Dep. of Crop and Soil Science, Columbia Basin Agric. Res. Ctr., P.O. Box 370, Oregon State Univ., Pendleton, OR 97801
Shandaweel Agric. Res. Stn., Gaziert Shandaweel, Sohag, Egypt
Gezira Res. Stn., Agric. Res. Corp., P.O. Box 126, Wad Medani, Sudan
USDA-ARS Columbia Plateau Consrv. Res. Ctr., Pendleton, OR 97801

^* Corresponding author.

Genetic resistance is an important management component in the control of Russian wheat aphid (Diuraphis noxia Mordvilko) (RWA). The range of leaf symptoms associated with several resistance sources indicate that differences may occur in seedling development. This study was conducted to determine differences in wheat (Triticum aestivum L.) seedling shoot and root development among resistant and susceptible wheat genotypes infested with RWA. The effectiveness of one resistance source identified in greenhouse seedlings was characterized in field-grown F₂ plants. Visual damage and leaf and root development were measured for 17 lines in the greenhouse. Dry weight, grain yield, and harvest index were studied in infested and noninfested, field-grown F₂ populations generated from ‘Moro’/PI294994 and ‘Hyak’/PI294994. PI48650 and PI294994 had superior seedling shoot and nodal root system development when compared to susceptible genotypes. Visual evaluations were effective in separating susceptible genotypes from potential resistance sources; however, leaf symptoms were not effective in characterizing the most promising RWA resistance resources. Root measurements in conjunction with leaf symptoms identified seedling genotypes least affected by RWA. Russian wheat aphid resistant adult plants produced significantly more dry weight and grain yield and a greater harvest index than susceptible plants in the two populations. Trends for these characteristics were similar for resistant plants in the infested population and plants in the noninfested population.

Received for publication December 14, 1992.