| occurrence of (+)- and (-)-gossypol in wild species of cotton and in gossypium hirsutum var. marie-galante (watt) hutchinson. | gossypol occurs as a mixture of enantiomers in cottonseed. these enantiomers exhibit different biological activities. the (-)-enantiomer is toxic to animals, but it has potential medicinal uses. therefore, cottonseed with >95% (-)-gossypol could have biopharmaceutical applications. the (+)-enantiomer shows little, if any, toxicity to nonruminant animals. thus, cottonseed with >95% (+)-gossypol could be more readily utilized as a feed for nonruminants. the (+)- to (-)-gossypol ratio in commercial ... | 2005 | 16076104 |
| an unusual ribosomal dna sequence from gossypium gossypioides reveals ancient, cryptic, intergenomic introgression. | the new world allopolyploid (ad-genome) cottons (gossypium) originated through hybridization of ancestral diploid species that presently have allopatric ranges in africa-asia (the a-genome) and the american tropics and subtropics (the d-genome). phylogenetic analysis of sequence data from the ribosomal dna internal transcribed spacer region (its1, 5.8s rrna, its2) reveals two strongly supported clades, one corresponding to african species and the other containing all american d-genome species ex ... | 1995 | 8845966 |
| phylogeny, duplication, and intraspecific variation of adh sequences in new world diploid cottons (gossypium l., malvaceae). | the 13 "d-genome"cotton species are a monophyletic assemblage of morphologically diverse diploids that inhabit arid to semiarid regions in mexico, with 1 disjunct species each in peru and the galapagos islands and 1 species whose range extends northward into arizona. while these species lack commercially significant fiber (i. e., cotton), they are important in that they represent one of the parental genomes of the cultivated tetraploid cottons. to assess phylogenetic relationships among these sp ... | 2000 | 10877941 |
| cryptic repeated genomic recombination during speciation in gossypium gossypioides. | the mexican cotton gossypium gossypioides is a perplexing entity, with conflicting morphological, cytogenetic, and molecular evidence of its phylogenetic affinity to other american cottons. we reevaluated the evolutionary history of this enigmatic species using 16.4 kb of dna sequence. phylogenetic analyses show that chloroplast dna (7.3 kb), nuclear ribosomal internal transcribed spacers (its; 0.69 kb), and unique nuclear genes (8.4 kb) yield conflicting resolutions for g. gossypioides. eight l ... | 2003 | 14686525 |
| dispersed repetitive dna has spread to new genomes since polyploid formation in cotton. | polyploid formation has played a major role in the evolution of many plant and animal genomes; however, surprisingly little is known regarding the subsequent evolution of dna sequences that become newly united in a common nucleus. of particular interest is the repetitive dna fraction, which accounts for most nuclear dna in higher plants and animals and which can be remarkably different, even in closely related taxa. in one recently formed polyploid, cotton (gossypium barbadense l.; ad genome), 8 ... | 1998 | 9582192 |