Resistance to Soybean Rust and Mode of Inheritance1

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Abstract
A study was conducted in containment facilities to determine the reaction to Phakopsora pachyrhizi Syd. (soybean rust) isolates from widely separated geographic areas on seven soybean [Glycine max (L.) Merr.] strains rated moderately resistant in field planting in Taiwan. Additional studies were conducted to determine the mode of inheritance of resistance to several rust isolates. Soybean strains PI 230970 and PI 230971 were resistant when inoculated with P. pachyrhizi isolates Australia‐72‐1, India‐73‐1, Philippines‐77‐1, and Taiwan‐72‐1. The other five soybean strains, although rated moderately resistant in field planting in Taiwan, were rated susceptible in these studies. All were rated resistant to an isolate with low virulence from Puerto Rico.Individual trifoliolate leaves of soybean plants of an F2 population of ‘Centennial’ × PI 230970 were inoculated with rust isolates from three different geographic areas. Plants rated as resistant to one isolate were resistant to all isolates. Similarly, plants rated susceptible to one isolate were susceptible to all isolates. A ratio of 92 resistant to 31 susceptible was obtained. Twenty‐five F2 plants from the cross D75‐10169 × PI 230971 gave 19 resistant and six susceptible plants after inoculation with the Taiwan isolate. The results suggest a single dominant gene for resistance to soybean rust.

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