Gossypium Tomentosum Research Articles

Genetic Diversity and Origin of the Hawaiian Islands Cotton, Gossypium tomentosum

Gossypium tomentosum is the only member of the cotton genus endemic to the Hawaiian archipelago. It is morphologically distinct from other allopolyploid Gossypium species, and its phylogenetic relationships with them are uncertain. Chloroplast and ribosomal DNA restriction site variation were used to estimate the phylogeny of the allopolyploids. Gossypium mustelinum is resolved as sister to the remaining allopolyploid species, which include two species-pairs, G. barbadense-G. darwinii and G. hirsutum (including G. lanceolatum)-G. tomentosum. This indication that G. tomentosum is sister to G. hirsutum is supported by allozyme data. Gossypium tomentosum is proposed, based on biogeographic evidence and molecular data, to have originated by transoceanic dispersal from a Mesoamerican progenitor. Few restriction site variants were observed among the allopolyploids, suggesting that present lineages diverged relatively rapidly following polyploidization. Allozyme analysis of 30 G. tomentosum accessions collected from seven islands revealed relatively low levels of genetic diversity: 11 of 50 loci were polymorphic, mean number of alleles per locus was 1.24, and mean panmictic heterozygosity was 0.033. Little geographic patterning of allelic distributions was observed. Despite historical cultivation of G. barbadense and G. hirsutum in Hawaii and the existence of their naturalized derivatives, no allozyme evidence of interspecific introgression into G. tomentosum was detected.

GENETIC DIVERSITY AND ORIGIN OF THE HAWAIIAN ISLANDS COTTON, GOSSYPIUM TOMENTOSUM

Gossypium tomentosum is the only member of the cotton genus endemic to the Hawaiian archipelago. It is morphologically distinct from other allopolyploid Gossypium species, and its phylogenetic relationships with them are uncertain. Chloroplast and ribosomal DNA restriction site variation were used to estimate the phylogeny of the allopolyploids. Gossypium mustelinum is resolved as sister to the remaining allopolyploid species, which include two species‐pairs, G. barbadense‐G. darwinii and G. hirsutum (including G. lanceolatum)‐G. tomentosum. This indication that G. tomentosum is sister to G. hirsutum is supported by allozyme data. Gossypium tomentosum is proposed, based on biogeographic evidence and molecular data, to have originated by transoceanic dispersal from a Mesoamerican progenitor. Few restriction site variants were observed among the allopolyploids, suggesting that present lineages diverged relatively rapidly following polyploidization. Allozyme analysis of 30 G. tomentosum accessions collected from seven islands revealed relatively low levels of genetic diversity: 11 of 50 loci were polymorphic, mean number of alleles per locus was 1.24, and mean panmictic heterozygosity was 0.033. Little geographic patterning of allelic distributions was observed. Despite historical cultivation of G. barbadense and G. hirsutum in Hawaii and the existence of their naturalized derivatives, no allozyme evidence of interspecific introgression into G. tomentosum was detected.

THE LECTOTYPIFICATION OF GOSSYPIUM TOMENTOSUM SEEM. AND THE NAME OF THE HAWAIIAN ENDEMIC GOSSYPIUM

SummaryIt is again demonstrated that Gossypium sandvicense Parlatore is the correct name of the endemic Hawaiian Gossypium and that the lectotype of Gossypium tomentosum Seem, should be Seemann 28 (K), a specimen collected in Fiji and a synonym of Gossypium hirsutum L. s.l. The greater part of the original description of Gossypium tomentosum was derived from the introduced Fijian cotton and contradicts the characters possessed by the Hawaiian species.

THE CORRECT NAME FOR THE HAWAIIAN GOSSYPIUM: G. SANDVICENSE

TAXONVolume 26, Issue 1 p. 140-140 Nomenclature THE CORRECT NAME FOR THE HAWAIIAN GOSSYPIUM: G. SANDVICENSE Robert L. Wilbur, Robert L. Wilbur Department of Botany, Duke University, Durham, N.C., U.S.A.Search for more papers by this author Robert L. Wilbur, Robert L. Wilbur Department of Botany, Duke University, Durham, N.C., U.S.A.Search for more papers by this author First published: February 1977 https://doi.org/10.2307/1220225Citations: 2AboutPDF 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 onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume26, Issue1February 1977Pages 140-140 RelatedInformation