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CROP BREEDING & GENETICS

Soybean Aphid Resistance in PI 243540 Is Controlled by a Single Dominant Gene

^a National Institute of Crop Science, RDA, 151 Seodun-dong, Suwon 441-857, Korea, and USDA-ARS, 1680 Madison Ave., Wooster, OH 44691
^b USDA-ARS and Dep. of Horticulture and Crop Science, The Ohio State Univ., 1680 Madison Ave., Wooster, OH 44691
^c Dep. of Entomology, OARDC, The Ohio State Univ., 1680 Madison Ave., Wooster, OH 44691

^* Corresponding author (mian.3{at}osu.edu).

The soybean aphid (Aphis glycines Matsumura) is a pest of soybean [Glycine max (L.) Merr.] in many soybean growing countries of the world. Host plant resistance is a very useful component of an integrated pest management program to control an insect problem. A maturity group (MG) IV plant introduction (PI) 243540 showed strong antibiosis resistance against the Ohio biotype of the soybean aphid. The objective of this study was to determine the inheritance of soybean aphid resistance gene(s) in PI 243540. The F₁, F₂, and F₂-derived F₃ families from a cross between an aphid susceptible cultivar Wyandot and resistant PI 243540 were screened in a greenhouse with the Ohio biotype of the soybean aphid. All F₁ plants were resistant to the soybean aphid and ² analysis of segregation of 341 F₂ plants indicated a fit to a single dominant gene ratio of 3:1 (P = 0.51). Segregation in 330 F_2:3 families fit an expected 1:2:1 ratio (P = 0.40). Our results indicate that a single dominant gene controls the soybean aphid resistance in PI 243540. The simple inheritance of this gene should be helpful to quickly transfer the gene to susceptible elite cultivars using the backcross breeding approach.

Abbreviations: IPM, integrated pest management • MG, maturity group • OARDC, Ohio Agricultural Research and Development Center • PCR, polymerase chain reaction • PI, plant introduction • SSR, simple sequence repeat