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Inheritance of yielding capacity in a fifteen-parent diallel cross of barley



Inheritance of yielding capacity in a fifteen-parent diallel cross of barley



Canadian Jour Genetics And Cytol 1(3): 208-265



In undertaking the study of the inheritance of yielding capacity in barley, it was assumed that yield is a complex character comprising 3 components: number of heads per plant, number of kernels per head, and weight of kernel and that the inheritance of yield, and of each of its components, are controlled by polygenes. Therefore, the genetic analyses were carried out by the techniques of biometrical genetics. Fifteen barley varieties (10 six-rowed and 5 two-rowed), chosen for special attributes, were crossed unidirectionally in all combinations (15-parent diallel) giving a total of 105 individual crosses. The F1 materials of a 9-parent diallel (36 crosses) were grown in the greenhouse in 1955-56, and the remaining materials (69 crosses) in 1956-57. Each cross was represented by 40 plants grown in four replications (10-plant rows). Highly significant correlation coefficients were obtained, for yields, between all generations. Genetical analyses have been largely graphical. These were based on inter-relations of the covariance between the parents and the rth array (Wr) and of the variance of the rth array (Vr), and were supplemented by plotted standardized deviations of the parental measurement (Yr) and the sum (Wr + Vr). The F1 analysis for inheritance of yield showed strong average overdominance in all arrays of the 9-parent diallel. The F2 (1957) analysis for yield (in the 15-parent diallel) again showed an average tendency toward overdominance. There was a well-marked association between high yield and an excess of recessive genes, and conversely between low yield and an excess of dominant genes. In the F2 (1958) analysis, based on a 10-parent diallel, there was some disturbance in inheritance attributable to the abnormally wide spacing of plants, which favored the high-tillering propensities of 2-rowed materials. High expressions of the complex character, yield per unit area, and of its components, number of heads per plant and number of kernels per head, were associated with an excess of recessive genes. The component, weight of kernel, however, showed association between high weight and an excess of dominant genes. The component, number of kernels per head, was shown in both F2 (1958) and F3 (1958) to be predominant in determining yield under the conditions obtaining in the experiment. It is suggested that the general similarity of inheritance for all 3 yield components (high expression of each character associated with an excess or recessive genes) may represent different physiologically-controlled expressions of the same genes (or effective factors). The results from the analysis are considered to provide useful guidance to plant breeders in the selection of new, high-yielding varieties of barley.

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Accession: 014082626

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DOI: 10.1139/g59-029


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