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Publication Type J
Authors Sanderson, S. C.
Title THE PLOIDY RACES OF ATRIPLEX CONFERTIFOLIA (CHENOPODIACEAE)
Source Western North American Naturalist
Author Keywords canescens chenopodiaceae angustifolium onagraceae chromosome-numbers flowering plants gene-expression hybrid zones evolutionary mechanisms shadscale autopolyploidy
Abstract Previous accounts of polyploidy in the North American salt desert shrub Atriplex confertifolia (shadscale) have dealt with the distribution of polyploidy and the morphological and secondary chemical differences between races. The present study amplifies these studies and reveals additional ploidy-flavonoid races, with ploidy levels known to extend from 2x to 12x, and all except 2x and I 2x represented by races with and without 6-methoxylation of flavonol compounds. Results of this study show that diploids across their range have about 113% as much DNA per genuine as do polyploids and that parallel variation in monoploid genuine size between diploids and accompanying polyploids can be shown in different parts of the species' range. Polyploidy, therefore, appears to have developed independently in several areas of the western United States. Hexaploids are generally not as common as octoploids in shadscale, which could be an indication of diploidization of older tetraploid races.
Author Address [Sanderson, Stewart C.] US Forest Serv, Rocky Mt Res Stn, Shrub Sci Lab, Provo, UT 84606 USA. ssanderson@fs.fed.us
ISSN 1527-0904
ISBN 1527-0904
29-Character Source Abbreviation West. North Am. Naturalist
Publication Date Apr
Year Published 2011
Volume 71
Issue 1
Beginning Page 67-77
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