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Identification of a Fourth Major Gene Conferring Resistance to Soybean Rust¹

Studies were conducted in containment facilities at Frederick, MD to determine the genetic basis of resistance to Phakopsora pachyrhizi Syd. (incitant of soybean rust) carried by the soybean [Glycine max (L.) Merr.] line PI 459025. Previous studies showed that soybean genotypes PI 200492, PI 230970, and PI 462312 each carried a single dominant gene conferring resistance to a specific soybean rust isolate. Genotype PI 200492 gave a near-immune reaction to rust isolate India 73-1 and a susceptible reaction to Taiwan 72-1. Genotype PI 462312 gave a resistant reaction to the India rust isolate and a susceptible reaction to the Taiwan isolate. Genotype PI 230970 and F₄ lines having PI 230970 as a parent gave resistant reactions to both rust isolates. Genotype PI 200492, PI 230970, and PI 462312 gave a susceptible reaction when inoculated with rust isolate Taiwan 80-2. Line PI 459025 was identified as resistant to Taiwan 80-2 as well as Taiwan 72-1 and India 73-1. Line PI 459025 was crossed with each of the three previously identified sources of resistance. The F₁ plants, F₂ populations, and selected F₃ lines were inoculated with each of the three rust isolates to determine their reaction. For each plant evaluated, a leaflet of a single trifoliolate leaf was inoculated with a different rust isolate. The results showed that PI 459025 carried a single dominant gene for resistance to all three rust isolates and that this gene was at a different locus from the three previously identified genes conferring resistance to specific rust isolates. The genotype assigned for rust resistance of PI 459025 is rpp₁ rpp₁ rpp₂ rpp₂ rpp₃ rpp₃ Rpp₄ Rpp₄.

Key Words: Glycine max (L.) Merr. • Phakopsora pachyrhizi Syd. • Dominant gene • Containment facilities

² Research agronomist, USDA-ARS, Soybean Production Res., P. O. Box 196, Stoneville, MS 38776.

Received for publication December 5, 1985.

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