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Inheritance of Heading Date, Plant Height, and Kernel Weight in Two Spring Wheat Crosses¹

Inheritance of heading date, plant height, and kernel weight was studied in two crosses of spring wheats (Triticum aesticum L.) involving three cultivars, ‘Timgalen,’ ‘Sonora 64A,’ and ‘Eagle.’ Means and variances were estimated for six populations: P₁, P₂, F₁, F₂, and the two first backcrosses, B₁ and B₂. Estimates of heritability and genetic advance indicated that considerable progress could be made by applying selection pressures for the three characters. Gene action appeared to be primarily additive in the expression of these characters.

Key Words: Additive genetic variance • Genetic advance • Heritability • Hybrid bulks • Selection pressure • Wheat breeding

² Plant Breeder, the University of Sydney, North West Wheat Research Institute, Narrabri, N.S.W. 2390, Australia. The author is grateful to Prof. I. A. Watson and Mr. N. F. Derera for reading the manuscript and making useful suggestions.

Received for publication July 31, 1971.