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United States Department of Agriculture

Agricultural Research Service


item Graybosch, Robert - Bob
item Peterson, C
item Porter, David
item Chung, Okkyung

Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/31/2003
Publication Date: 7/6/2004
Citation: Graybosch, R.A., Peterson, C.J., Porter, D.R., Chung, O.K. 2004. Registration of n96l9970 greenbug resistant wheat (triticum aestivum l.). Crop Science. 44:1492-1493.

Interpretive Summary: Greenbug is an important pest of wheat. The economic impact of greenbug infestation is estimated as over $250 million annually through crop losses and pesticide expenses. Several genetic types (biotypes or races) of greenbug exist, being most common in the southern Great Plains. One source of multiple biotype resistance, GRS1201, was released by USDA-ARS in 1993. While an excellent source of resistance, GRS1201 was somewhat deficient in other agronomic traits. It had low yield potential and a tendency to lodge. GRS1201 was mated to TAM202, a commercial cultivar produced by Texas A&M University. From this cross, the line N96L9970 was derived. N96L9970 is superior to GRS1201 in that it is more widely adapted, produces higher grain yields, and has good resistant to lodging. N96L9970 now is available to wheat breeding programs as a source of the greenbug resistance.

Technical Abstract: `N96L9970¿, is a hard red winter wheat (Triticum aestivum L.) germplasm line developed cooperatively by the United States Department of Agriculture, Agricultural Research Service, and the Nebraska Agricultural Experiment Station, and was released in June, 2002. N96L9970 carries resistance to multiple biotypes of greenbug (Schizaphis graminum Rondani). N96L9970 (PI 619231, GRS1201/TAM-202) is resistant to greenbug biotypes B, C, E, G, I and K. GRS1201 carries a 1AL.1RS wheat-rye (Secale cereale L.) chromosomal translocation originally produced from an irradiated alien chromosome substitution plant derived from a wheat X rye hybrid (short wheat selection/Scout[TX69A345-2]//Insave rye/3/TAM101). TAM-202 (described as an outcross between an unknown parent and `Siouxland¿) carries a different 1AL.1RS translocation. The greenbug resistance of N96L9970 is located on the 1AL.1RS translocation inherited from GRS1201. N96L9970 primarily was released due to significant agronomic performance relative to GRS1201, the only previously released source of resistance to greenbug biotypes B, C, E, G, I and K.

Last Modified: 10/19/2017
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