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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #227975

Title: Inheritance of cyst nematode resistance in a new genetic source Glycine max PI 494182

Author
item Arelli, Prakash
item WANG, DECHUN - MICHIGAN STATE UNIVER.

Submitted to: Journal of Crop Science and Biotechnology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/9/2008
Publication Date: 12/30/2008
Citation: Arelli, P.R., Wang, D. 2008. Inheritance of cyst nematode resistance in a new genetic source; Glycine max PI 494182. Journal of Crop Science and Biotechnology. 11(3):83-90.

Interpretive Summary: Worldwide soybean cyst nematode is a major pest on soybean crop. In the United States alone nearly a billion dollars are lost annually due to soybean cyst nematode. To reduce crop losses growers plant resistant cultivars. All resistant cultivars grown today have derived their resistance primarily from two sources, Peking and/or PI 88788. Nematodes have adapted to both the sources of resistance. New sources should be identified and used for broadening the resistance in cultivars. Soybean PI 494182 is a newly found source of resistance to multiple nematode populations. Understanding genetic mechanisms of resistance in PI 494182 is most valuable for developing cultivars with durable resistance. We have determined number of genes controlling resistance in PI 494182. This information will be highly useful for developing soybean cultivars with broad resistance to nematodes.

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, and 5 (corresponding to HG Types 2.5.-; 0; 2.5.7, respectively). PI 494182 may be a potential source for diversifying SCN resistance genes in the soybean cultivars and provide durable resistance especially in the Mid south area. We have determined inheritance of resistance in PI 494182 to SCN Races 1, 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 F2 derived F3 progenies for SCN reaction. Based on chi-square tests, a two-gene (rhg, rhg) model is proposed for resistance to Race 1 and a three-gene model is proposed for resistance to both the Races 3 (Rhg, Rhg, rhg) and 5 (Rhg, rhg, rhg). Correlation coefficient analysis indicated that some genes conditioning resistance to races 1, 3, and 5 are shared or closely linked with each other. These results will be useful to soybean breeders for developing soybean cultivars for broad resistance to nematodes.