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Title: Registration of STARS 1501B and STARS 1502B barley germplasm with Rsg2 resistance to greenbug

item Mornhinweg, Dolores - Do
item Armstrong, John
item CARVER, BRETT - Oklahoma State University
item Springer, Timothy

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 11/15/2017
Publication Date: 5/1/2018
Citation: Mornhinweg, D.W., Armstrong, J.S., Carver, B.F., Springer, T.L. 2018. Registration of STARS 1501B and STARS 1502B barley germplasm with Rsg2 resistance to greenbug. Journal of Plant Registrations. 12(2):237-240.

Interpretive Summary: Greenbug is a serious pest of small grains worldwide and a persistent pest of wheat and barley in the western U.S., especially in the southern Great Plains. Two single dominant genes for greenbug resistance, Rsg1 and Rsg2, have been reported in barley. All greenbug resistant U.S. barley cultivars have Rsg1 resistance. Biotypes and host races of greenbug have been reported which can overcome Rsg1 resistance. This article reports the release of both spring and winter barley germplasm with Rsg2 greenbug resistance now available to barley breeders for protection against yield loss from future biotype shift.

Technical Abstract: STARS 1501B (Reg. No. GP- , PI 675335) greenbug-resistant, six-rowed, spring, feed barley (Hordeum vulgare L.) germplasm and STARS 1502B (Reg. No. GP-, PI 675336) greenbug-resistant, six-rowed, winter, feed barley germplasm, tested as GR 001 and GR 010 respectively, were developed and released by USDA-ARS, Stillwater, OK as sources of resistance to greenbug [Schizaphis graminum (Rodani)]. STARS 1501B is a selection from PI 426756 and STARS 1502B was developed by repeated backcrossing of STARS 1501B into 'Weskan' (PI 560331). STARS 1501B had greater grain yield than 'Morex' in the greenhouse, and STARS 1502B was comparable to Weskan in grain yield, plant height, and test weight in the field, in the absence of greenbug. These lines are the first barley germplasm with Rsg2 greenbug resistance and they offer genetic diversity from currently deployed Rsg1 greenbug-resistant cultivars vital to ensure protection from yield loss as greenbug biotypes continue to shift.