Registration of ‘Clara CL’ Wheat

Abstract

‘Clara CL’ (Reg. No. CV-XX; PI 665948) hard white winter wheat (Triticum aestivum L.) cultivar was developed at the Agricultural Research Center–Hays, Kansas State University and released by the Kansas Agricultural Experiment Station in 2011. Clara CL carries one Clearfield gene and has tolerance to imazamox herbicide. Clara CL was selected from a single cross of KS03HW154/KS03HW1 using a modified bulk breeding method. Both parental lines are unreleased hard white winter experimental lines from Kansas State University. The objective of the cross was to develop a hard white winter wheat variety with herbicide resistance and adaptation to the semiarid area in western Kansas. Clara CL was released because of its tolerance to imazamox herbicide, high grain yield potential under nonirrigated conditions in western Kansas, preharvest sprouting tolerance, and good disease and insect resistance. T.J. Martin and G. Zhang, Agricultural Research Center–Hays, Kansas State Univ., Hays, KS 67601; A.K. Fritz, Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506; R. Miller, Dep. of Grain Science and Industry, Kansas State Univ., Manhattan, KS 66506; M.-S. Chen, USDA–ARS, Hard Winter Wheat Genetics Research Unit, Kansas State Univ., Manhattan, KS 66506. Registration by CSSA. Received 23 July 2013. *Corresponding author (gzhang@ksu.edu). Abbreviations: ARCH, Agricultural Research Center–Hays; AYN, advanced yield nursery; HWWW, hard white winter wheat; KIN, Kansas Intra-State Nursery; KSU, Kansas State University; PPO, polyphenol oxidase; PYN, preliminary yield nursery; SBMV, Soil-borne mosaic virus; SRPN, Southern Regional Performance Nursery; WQC, Wheat Quality Council; WSMV, Wheat streak mosaic virus. ‘Clara CL’ (Reg. No. CV-XX; PI 665948) is a hard white winter wheat (Triticum aestivum L.) (HWWW) variety developed at the Agricultural Research Center–Hays (ARCH), Kansas State University (KSU), and released by the Kansas Agricultural Experiment Station in 2011. Clara CL was selected from the single cross KS03HW154/KS03HW1. Both parental lines, KS03HW154 and KS03HW1, are unreleased hard white winter experimental lines developed at ARCH. KS03HW154 is a sister line to ‘RonL’ (PI 648020) with the pedigree ‘Trego’ (PI 612576; Martin et al., 2001)/CO960293. KS03HW1 was derived from the four-way cross FS2/KS97HW150//KS97HW349/3/Trego. FS2 is a proprietary wheat germplasm developed by BASF Corporation (formerly American Cyanamid) through induced mutagenesis, and it carries Als1 locus (D genome) conferring tolerance to the imidazolinone class of herbicides (also known as Beyond herbicide) (Newhouse et al., 1992). Clara CL is an F6–derived line, which was tested as experimental line number KS08HW35-1. Clara CL was released because of its imazamox herbicide tolerance, high grain yield potential in the dryland production system in western Kansas, preharvest sprouting tolerance, and good resistance to the major diseases in western Kansas. CL in the name stands for Clearfield, the trademark for Beyond herbicide tolerance.