Aneuploidy, structural chromosome changes, and DNA amounts in the annual taxa of the Haplopappus spinulosus complex.
Chromosome Res
; 1(1): 53-61, 1993 May.
Article
em En
| MEDLINE
| ID: mdl-8143089
ABSTRACT
Haplopappus gracilis (n = 2), Haplopappus ravenii (n = 4), and Haplopappus wigginsii (n = 4) are isolated by F1 hybrid sterility due mainly to translocation heterozygosity. There is no evidence that this can be overcome at the diploid level so that introgression can occur among them. They are also separated geographically, but occasional populations of H. gracilis and H. ravenii may be brought together along roadways to form sterile hybrids. There were no statistically significant differences in nuclear DNA content among the same or structurally different aneuploid n = 2 and n = 3 chromosome races or ecotypes of H. gracilis. Some of the H. gracilis races were not significantly different from one race of the ancestral H. ravenii, and these samples of both species were from plants growing on poor soils in contrast to accessions from normal habitats. How much and which classes of DNA in these species are subject to changes induced by environmental effects is not known. There were no correlations between DNA amounts and altitude, latitude, and longitude. H. wigginsii had a greater amount of DNA per nucleus than either H. ravenii or H. gracilis, and its increased DNA content may reflect a more rapid accumulation of noncoding sequences due to facultative self-compatibility not found in the other two species.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Plantas
/
DNA
/
Cromossomos
/
Aneuploidia
Tipo de estudo:
Incidence_studies
Idioma:
En
Revista:
Chromosome Res
Assunto da revista:
BIOLOGIA MOLECULAR
Ano de publicação:
1993
Tipo de documento:
Article