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ABS|IRACTInheritance of stem solidness was studied in populations of F, and Br-lines from the Red Bobs X C.T. 715 and Redman X S-61t (Triticum desti'uum L.) -crosses and backcrosses. Th" data supported the hypothesis that the varieties in each cross differed by four genes for stem solidness. In both crosse,s, one gene exeiied a maior'influenc"e in that its allele for hollowness in the homozygous ;;;diti.; *"6 .pirt"ti" to the other three genes. The other three genes within each cross wer'e similar in their influen"ce on solidness. Between the two crosses, corresponding genes differed in some degree.Genetic analyses and correlation coeficients both revealed a close-association b.i*""" ir*ily r"sirtatrce and stem solidness in the Red Bobs X C--T. 715 cross indicatinE thai the stem solidness characrer was largely responsible for conditioning the degree of sawfly reaction in a plant.In both crosses, a weak negative correlation was found between stem solidness and heisht. St'em solidnesi was nor associated with bunt (race T-2) reaction,

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Significant levels of heterosis were demon-sis resulting from hybridization of genetically strated in F yield trials from crosses between diverse spiing anci winter types." To ouithree spring_and three win_ter wheats (7. aesti-knowledg6 thii is the f,rst pubdJhed repo.roi yym -L.): -Thatcher X Winalta, Cypress y heterosis" for yield in f'. fryUriO, tii*."n Slrq*ou 22 MC, and Lee X Cheyenne. spring and winter wheat cultivars. This in_ Yrelcls up to 4O7o higher than those of the formation has significance in both hybrid spring wheat parent were attributed to hetero-wheat and convenlional breeding ptog.u-..