Registration of KS92WGRC17, KS92WGRC18, KS92WGRC19, and KS92WGRC20 Winter Wheat Germplasm Resistant to Hessian Fly

KS92WGRC17 (Reg. no. GP-501, P1 592729), KS92WGRC18 (Reg. no. GP-502, P1 592730), KS92WGRC19 (Reg. no. GP-503, P1592731), and KS92WGRC20 (Reg. no. GP-504, P1592732) are hard red winter wheat (Triticum aestivum L.) germplasms resistant to all currently recognized biotypes of the Hessian fly [Mayetiola destructor (Say)]. They were released jointly by USDA-ARS and the Kansas Agricultural Experiment Station in 1992. The gene H25, which confers resistance in all four germplasms, is located on chromosome arm 6RL from the rye (Secale cereale L.) cultivar Balbo. Three different translocations involving 6RL were incorporated into four germplasms with three different pedigrees (Table 1). To induce the translocations, pollen grains from multiple-parent BC2F2 wheat addition lines carrying 6R were Xrayed and used to fertilize euploid wheat lines (1). The most agronomically desirable Xs-derived to Xg-derived lines homozygous for each translocation were selected. KS92WGRC17 carries almost the complete arm of 6RL translocated to the long arm of 6B. KS92WGRC18 and KS92WGRC19 each carry a smaller segment of 6RL translocated to the long arm of 4B. A second wheat-rye translocation, T1AL-1RS, is absent from KS92WGRC18 and present in KS92WGRC19. KS92WGRC20 carries a small segment of 6RL as an intercalary translocation in the proximal region of the 4AL arm of wheat. Chromosome designations for 4A and 4B follow Dvofak (2), as approved at the 7th International Wheat Genetics Symposium (3). In 1995 field plots at Manhattan and Hutchinson, KS, both KS92WGRC19 and KS92WGRC20 had heading dates equivalent to those of early-heading cultivars Karl 92 and TAM 107; KS92WGRC17 headed 12 d later, and KS92WGRC18 7 d later, than Karl 92 and TAM 107. KS92WGRC17 and KS92WGRC19 were similar in plant height to Karl 92 and TAM 107, whereas KS92WGRC18 was 15 cm taller and KS92WGRC20 10 cm taller. KS92WGRC20 was highly susceptible to wheat soilborne mosaic virus (SBWMV) at Manhattan, whereas the other three germplasms were moderately susceptible. KS92WGRC20 experienced winter injury and severe lodging at both locations. Small quantities (3 grams) of seed of KS92WGRC17, -18, -19, and -20 are available upon written request. We ask that appropriate recognition of source be given when these germplasms contribute to research or development of new cultivars. Seed stocks are maintained by B.S. Gill, Wheat Genetics Resources Center, Department of Plant Pathology, Throckmorton Hall, Kansas State University, Manhattan, KS 66506.