Incongruence in the diploid B-genome species complex of Glycine (Leguminosae) revisited: histone H3-D alleles versus chloroplast haplotypes.
نویسندگان
چکیده
Variation at the single-copy nuclear locus histone H3-D was surveyed in the diploid B-genome group of Glycine subgenus Glycine (Leguminosae: Papilionoideae), which comprises three named Australian species and a number of distinct but as yet not formally recognized taxa. A total of 23 alleles was identified in the 44 accessions surveyed. Only one individual was clearly heterozygous, which is not surprising given the largely autogamous breeding system of subgenus Glycine. Alleles differed by as many as 19 nucleotide substitutions, nearly all in the three introns; length variation was minimal. Phylogenetic analysis identified two shortest allele trees with very little homoplasy, suggesting that recombination has been rare. Both topological and data set incongruence were statistically significant between histone H3-D allele trees and trees inferred from chloroplast DNA haplotypes previously described from these same accessions. Whereas the distribution of H3-D alleles agrees well with morphologically based taxonomic groupings, chloroplast DNA haplotype polymorphisms transgress species boundaries, suggesting that the chloroplast genome is not tracking taxic relationships. Divergences among chloroplast DNA haplotypes involved in such transgressive patterns appear to be more recent than speciation events, suggesting hybridization rather than lineage sorting.
منابع مشابه
Origins, colonization, and lineage recombination in a widespread perennial soybean polyploid complex.
Polyploidy is a dominant feature of flowering plant genomes, including those of many important crop species, implying that polyploidy confers evolutionary advantages on plant species. Recent molecular studies suggest that polyploids often originate many times from the same progenitor diploids. For this to provide a broader genetic base for a polyploid species, there must be lineage recombinatio...
متن کاملSize homoplasy in chloroplast microsatellites of wild perennial relatives of soybean (Glycine subgenus Glycine)
Microsatellites are a rich and readily assayed source of variation for genetic and evolutionary studies. Recently, simple sequence repeats have been identified in the chloroplast genomes of pine (Powell et al. 1995b) and rice (Provan et al. 1996), and also in the cultivated soybean (Glycine max: Leguminosae) and its wild congeners (Powell et al. 1995a). The chloroplast genome has seen wide use ...
متن کاملComparative bioinformatics analysis of a wild diploid Gossypium with two cultivated allotetraploid species
Background: Gossypium thurberi is a wild diploid species that has been used to improve cultivated allotetraploid cotton. G. thurberi belongs to D genome, which is an important wild bio-source for the cotton breeding and genetic research. To a certain degree, chloroplast DNA sequence information are a versatile tool for species identification and phylogenetic implications in plants. Different ch...
متن کاملComparison of Chloroplast DNA Diversity in Some Iranian Apple Genotypes, Commercial Cultivars and Rootstocks
The chloroplastic DNA of 64 accessions of apple (Malus spp.) (54 Iranian genotypes, five commercial cultivars and five rootstocks) were analyzed to reveal their haplotypes by using Polymerase Chain Reaction-Restriction Fragment Length Polymorphism (PCR-RFLP) method. Approximately 4320 bp of the chloroplast genome was analyzed, by using two chloroplast universal primer pairs and two restriction ...
متن کاملEvolution of triploidy in Apios americana (Leguminosae) revealed by genealogical analysis of the histone H3-D gene.
Autotriploidy is normally considered to be maladaptive in plants because of its association with high levels of sterility. Nonetheless, triploid individuals are found in many plant species and play important roles in plant evolution, in particular as a first step toward tetraploid formation. However, few studies have addressed the evolutionary potential of triploid lineages, which may principal...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Molecular biology and evolution
دوره 16 3 شماره
صفحات -
تاریخ انتشار 1999