Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)




The basic objective in wheat breeding is yield improvement or stabilization. The factors upon which yield depends vary from one location to another. Water stress in Alberta, Canada, in the virtual absence of rust, is limiting on yield. In the eastern Dakotas, rust development is a prime factor affecting yield. Frankel stated that the yield of grain in wheat can be resolved into number of ears per plant, number of grains per ear and weight if grain. He indicated that these could be subject to further resolution, such as number of grains per ear into number of spikelets and number if grains per spikelet. Many of the characters of interest to the plant breeder, and yield characters in particular, are determined both the genotype of the plant and the environment in which it is grown. Genotype and environment interact so that such characters in segregating populations exhibit a continuous range of variability. The main theoretical problems in breeding for yield are the resolution of the variation into environmental and hereditable components and the discovery of the nature, organization, and action of the hereditable component. The primary objective of this study was to determine the effect of an environment, where supplemental moisture could be supplied and rust development was seldom serious, upon the heritability of yield in early generations of spring wheat crosses.

Library of Congress Subject Headings

Wheat -- Breeding
Wheat -- Genetics


Includes bibliographical references



Number of Pages



South Dakota State University