Prakash Arelli, USDA-ARS, 605 Airways Blvd., Jackson, TN 38301, United States of America and Dechun Wang, Michigan State Univ, A384-E Plant & Soil Bldg, East Lansing, MI 48824-1325.
Soybean [ Glycine max (L.) Merr] Plant Introduction 494182 is a newly found source of resistance to multiple cyst nematode (SCN: Heterodera glycines Ichinohe) populations. It is yellow-seeded, maturity group ‘0’ soybean , resistant to SCN Races 1, 3, 5 and, moderately resistant to Race 2 ( corresponding to HG Types 2.7, 0, 2.5.7, 1.2.7, respectively). PI 494182 may be a potential source for diversifying SCN resistance genes in the soybean cultivars and provide durable resistance . We have determined inheritance of resistance in PI 494182 to SCN Races 3 and 5. A segregating population was produced by crossing PI line with a susceptible cultivar Skylla. We used established greenhouse methods to evaluate 162 F3:4 progenies for nematode reaction. A female index of 10% was used to determine 20 resistant and 142 susceptible/segregating and three resistant and 159 susceptible/segregating plants for SCN Races 3 and 5, respectively. Based on chi-square values ( 0.394, 90%<P>80% ; 0.085, 80%<P>70% for SCN Races 3 and 5, respectively) a three-gene model is proposed for conditioning resistance to SCN Races 3 and 5. These genes are confirmed in a mapping study and the results will be useful to soybean breeders for developing cultivars for broad resistance.
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