Registration of 'Stingray CL+' soft white winter wheat

Authors: CARTER, ARRON - Washington State University; BALOW, KERRY - Washington State University; SHELTON, GARY - Washington State University; BURKE, ADRIENNE - Washington State University; HAGEMEYER, K - Washington State University; STOWE, A - Washington State University; WORAPONG, J - Washington State University; HIGGINBOTHAM, RYAN - Highline Grain Growers, Inc; Chen, Xianming; ENGLE, DOUGLAS - Washington State University; MURRAY, TIMOTHY - Washington State University; Morris, Craig

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/28/2020
Publication Date: 12/12/2020
Citation: Carter, A.H., Balow, K.A., Shelton, G.B., Burke, A.B., Hagemeyer, K.E., Stowe, A., Worapong, J., Higginbotham, R.W., Chen, X., Engle, D.A., Murray, T.D., Morris, C.F. 2020. Registration of 'Stingray CL+' soft white winter wheat. Journal of Plant Registrations. 15(1):161-171. https://doi.org/10.1002/plr2.20109.
DOI: https://doi.org/10.1002/plr2.20109

Interpretive Summary: The state of Washington has two general winter wheat production regions that are commonly defined by the amount of annual precipitation. Cropping systems vary markedly across these precipitations zones. Summer fallow rotations, chemical fallow rotations, annual cropping, minimum tillage, and no-tillage systems are among the several that exist. Within these, annual cropping and minimum/no-tillage are generally practiced in the high rainfall zones and have changed the complexity of herbicides required to control grassy weeds for wheat production in Washington State. Monocropping (wheat following wheat), minimum/no-tillage practices, and legume rotations have all contributed to an increase of grassy weeds, many of which have been difficult to control. The development and deployment of soft white winter (SWW) wheat cultivars with the Clearfield® Production System technology has been an important tool for wheat producers to manage weed pressure. ‘Stingray CL+’, a SWW wheat, was developed and released in March 2019 by the Agricultural Research Center of Washington State University. Stingray CL+ was released as a replacement for ‘ORCF-102’ (PI 641787), ‘UI Castle CL+’ (PI 675641) and ‘UI Magic CL+’ (PI 678629) in rainfed wheat production systems in the high rainfall regions of Washington State. ORCF-102 was once the most widely grown single-gene tolerant cultivar in the PNW. It slowly began to decrease in acres due to disease susceptibility and injury that could occur after application of Beyond if temperatures were below 4 °C. UI Magic CL+ is currently the most widely planted two-gene tolerant cultivar in the PNW.

Technical Abstract: Soft white winter (SWW) wheat (Triticum aestivum L.) cultivars with the Clearfield® Production System technology are an important tool for producers in wheat production regions of Washington State. Paired with the use of the group 2 (Amino Acid Inhibitors/ALS) Beyond® herbicide (imazamox), tolerant wheat allows producers options where the current herbicide chemistry has not been adequate to control grass weeds. The objective of this research was to develop a two-gene imazamox tolerant SWW cultivar with improved resistance to the stripe rust pathogen (caused by Puccinia striiformis Westend. f. sp. tritici Erikss.), has strawbreaker foot rot resistance (Oculimacula yallundae Crous & W. Gams and O. acuformis Crous & W. Gams), maintains high yield potential across production regions, and has improved end-use quality. ‘Stingray CL+’ (Reg. No. CV-xxxx, PI xxxxxx) SWW wheat was developed and released in March 2019 by the Agricultural Research Center of Washington State University. Stingray CL+ was tested under the experimental designations MAS100095-2-1-S10-1 and WA8275 CL+, assigned through progressive generations of advancement. Stingray CL+ is a two-gene imazamox tolerant semi-dwarf cultivar adapted for the high rainfall wheat production regions of Washington. Stingray CL+ has high-temperature adult-plant resistance to the stripe rust pathogen, carries the Pch1 gene for strawbreaker foot rot, is tolerant to the chemistry of Beyond® herbicide (imazamox), is intermediate in height, has mid-season maturity, and has high grain volume weight and grain yield. The end-use quality properties of Stingray CL+ are acceptable to meet both domestic and export market standards.