Chromosomes of Graptopetalum and Thompsonella (Crassulaceae)
1970; Wiley; Volume: 57; Issue: 9 Linguagem: Inglês
10.2307/2441277
ISSN1537-2197
Autores Tópico(s)Plant Pathogenic Bacteria Studies
ResumoAmerican Journal of BotanyVolume 57, Issue 9 p. 1115-1121 Article CHROMOSOMES OF GRAPTOPETALUM AND THOMPSONELLA (CRASSULACEAE) Charles H. Uhl, Charles H. Uhl Division of Biology, Cornell University, Ithaca, New YorkSearch for more papers by this author Charles H. Uhl, Charles H. Uhl Division of Biology, Cornell University, Ithaca, New YorkSearch for more papers by this author First published: 01 October 1970 https://doi.org/10.1002/j.1537-2197.1970.tb09915.xCitations: 9 I am indebted to Dr. Reid Moran, Natural History Museum, San Diego, California (collection numbers preceded by M), and to Mr. Paul Hutchison, formerly of the University of California Botanical Garden, Berkeley (collection numbers preceded by UC), for many plants and identifications and for many fruitful exchanges of ideas. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Chromosome numbers are reported for probably all 11 species of Graptopetalum (x = 30–35) and for both species of Thompsonella (x = 26). Plants of two species of Graptopetalum have gametic numbers from about 240–275, more than have been reported in any other seed plants. In hybrids the 30–35 chromosomes in the basic genome of Graptopetalum and likewise the 26 in Thompsonella apparently do not pair among themselves, and the genomes seem to be no more potent genetically than those of other species in their subfamily having as few as 12 chromosomes. Species with these gametic numbers are therefore considered to be diploid. On the other hand, in hybrids between a diploid and a plant with a very high chromosome number the phenotype of the latter predominates, and most of its chromosomes pair with each other. Many such hybrids are fertile. These facts suggest that the high polyploids arose by autoploidy rather than by alloploidy. Nevertheless, they may store heterozygosity at some gene loci and release it in various dosages and proportions each generation. Citing Literature Volume57, Issue9October 1970Pages 1115-1121 RelatedInformation
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