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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #223631

Title: Changes in Resistance of PI 88788 to Field Population of Soybean Cyst Nematode (SCN)

item Donald, Patricia
item Noel, Gregory

Submitted to: National Soybean Cyst Nematode Conference
Publication Type: Abstract Only
Publication Acceptance Date: 2/21/2008
Publication Date: 3/6/2008
Citation: Faghihi, J., Ferris, V., Donald, P.A., Noel, G.R., Welacky, T. 2008. Changes in Resistance of PI 88788 to Field Population of Soybean Cyst Nematode (SCN). National Soybean Cyst Nematode Conference. p. 50-51.

Interpretive Summary:

Technical Abstract: PI 88788 has been the major source of resistance to SCN for about three decades, and is estimated to be present in about 97% of varieties said to be resistant to SCN in the United States. In recent years researchers in the Midwest have observed that varieties with PI 88788 do not seem to be as resistant as they were formerly. Either the resistant soybean varieties have changed or the field populations of SCN have themselves changed in response to long exposure to PI 88788. Goals of this NCSRP funded research were to 1) Determine the current effectiveness of PI 88788 as a source of resistance to SCN in TN, IL, IN, and Ontario, Canada; and 2) Determine the reaction to other sources of SCN resistance in areas where PI 88788 may no longer be as effective. The areas were chosen on the basis of length of time that SCN varieties with PI 88788 resistance have been widely used. In TN, the area where PI 88788 has been used the longest, every SCN field population recovered with a high SCN population density was able to reproduce on PI 88788, and no Hg-Type 0 populations were found. In Ontario, where varieties with PI 88788 have been used for a shorter period of time, PI 88788 proved to be resistant to many field populations; but a larger than expected number of Ontario populations were found to develop on PI 548402 (Peking) and also on PI 90763, two sources of resistance not generally present in varieties grown in Ontario. While many field populations in IL and IN were unable to develop on PI 88788, other field populations were capable of reproducing on PI 88788. PI 548402, PI 90763, and PI 437654 continued to be effective sources of resistance to such populations tested. One SCN population from Ontario had a low level of reproduction on PI 437654, while none of the SCN populations from IN or IL were able to reproduce on PI 437654. The discoveries from this research will have important implications for future management options in all of these soybean-growing areas.