AGRONOMIC PERFORMANCE AND END-USE QUALITY OF 1B VS 1BL 1RS GENOTYPES DERIVED FROM WINTER-WHEAT RAWHIDE/

The winter wheat (Triticum aestivum L.) cultivar Rawhide is heterogeno us for the 1BL/1RS translocation. The 1BL/1RS translocation has been p roven to increase grain yield and decrease end-use quality in bread wh eat. The objective of this research was to investigate if the excellen t yield performance of Raw hide was due to higher yielding 1BL/1RS Lin es compensating for lower yielding in lines and if the acceptable qual ity of Rawhide was produced by higher end-use quality in lines compens ating for lower end-use quality 1BL/1RS lines. To do so, 19 homogeneou s in genotypes and 18 homogeneous 1BL/1RS genotypes were selected from Rawhide. These genotypes, three composites (Composite In, Composite 1 BL/1RS, and Composite Total), Rawhide, and three check cultivars, were evaluated in four Nebraska environments for grain yield, yield compon ents, and end-use quality traits. No significant differences were foun d between chromosome classes for grain yield. The 1BL/1RS genotypes ha d a higher kernel weight (4%) than 1B genotypes; however, the in genot ypes had a greater number of spikes per square meter (5%). Composites were no different from Rawhide and from each other for grain yield and yield components. For end-use quality traits, the 1BL/1RS genotypes h ad a higher protein content (137 mg g(-1)), similar mixing time (4.8 m in), and lower mixing tolerance (3.5) than in genotypes (132 mg g(-1), 5.0 min, and 4.9, respectively). However, a mixing tolerance value of 3.5 is acceptable. In general, no differences were found among the co mposites and between the composites and Rawhide for quality traits. He nce, the 1BL/1RS translocation was not beneficial for yield nor was it detrimental for end-use quality in this genetic background.