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The Journal of Heredity 1988:79(4):268-276
© 1988 The American Genetic Association 79:268-276

research-article

Natural and Artificial Hybridization between Big Sagebrush (Artemisia tridentata) Subspecies

E. D. McArthur, B. L. Welch, and S. C. Sanderson

Intermountain Research Station, Forest Service, U.S. Department of Agriculture, Shrub Sciences Laboratory, and Brigham Young University Provo, Utah.

Address reprint requests to Dr. McArthur, U.S.D.A. Forest Service, Shrub Sciences Laboratory, 735 N. 500 E., Provo, UT 84601

Abstract

Big sagebrush (Artemisia tridentata) and its allies (subgenus Tridentatae) form a widespread and successful western North American plant group. Natural hybridization apparently has been important in the differentiation and success of this group. Controlled hybridization, although difficult to achieve, was shown to be successful through detection and assay of chemical markers. Artificial and natural hybridization success between subspecies tridentata and vaseyana was demonstrated by analysis of putative hybrid and parental populations. Coumarins, monoterpenoids, and morphological characteristics were analyzed with analysis of variance, the Kruskai-Wallis H test, and principal components analysis. Hybridization in Tridentatae is important not only in the evolution of taxa but potentially in the production of desirable genotypes for artificial selection.


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