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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #201872

Title: Inheritance of Resistance in Soybean PI 494182 to Cyst Nematode Populations

item Arelli, Prakash

Submitted to: Crop Science
Publication Type: Abstract Only
Publication Acceptance Date: 10/20/2006
Publication Date: 11/14/2006
Citation: Arelli, P.R., Wang, D. 2006. Inheritance of Resistance in Soybean PI 494182 to Cyst Nematode Populations. Crop Science. Vol. 1: 53-54

Interpretive Summary:

Technical Abstract: 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). PI494182 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 PI494182 to SCN Races 3 and 5. A segregating population was produced by crossing the PI line with a susceptible cultivar Skylla. We used established greenhouse methods to evaluate 162 F3 derived F4 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%

80% ; 0.085,80%

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 being confirmed in a mapping study and results will be useful to soybean breeders for developing cultivars for broad resistance.