Abstract:
:Sequencing of a cytochrome oxidase II (COII) gene fragment in Bacillus taxa provided evidence that the bisexual B. rossius is the maternal ancestor of the hybridogenetic B. rossius-grandii strains and revealed the same ancestry for both parthenogenetic hybrids: the diploid B. whitei (B. rossius/grandii grandii) and the triploid B. lynceorum (B. rossius/grandii grandii/atticus). Present data clearly demonstrate that all Bacillus unisexuals arose through asymmetrical hybridization events and realized a paraphyletic derivation from the B. rossius redtenbacheri subspecies. The invention of B. rossius mitochondrial DNA haplotypes in specimens with B. grandii grandii nuclear genomes revealed the occurrence of androgenesis in nature. Natural androgens represent a peculiar escape from hybridity and can help maintain the hybridogenetic system through the production of the fathering taxon via hybrid females. Results from the COII gene support the phyletic relationships among taxa suggested by previous taxonomical approaches, but also indicate a departure of B. grandii subspecies from the established taxonomy. Assuming the existence of a molecular clock, the evaluated substitution rate brings the splitting between B. rossius and B. grandii/B. atticus back to 22.79 +/- 2.65 myr before present, while the origin of hybrids appears to be much more recent (1.06 +/- 0.53 myr).
journal_name
Mol Phylogenet Evoljournal_title
Molecular phylogenetics and evolutionauthors
Mantovani B,Passamonti M,Scali Vdoi
10.1006/mpev.2000.0850keywords:
subject
Has Abstractpub_date
2001-04-01 00:00:00pages
157-63issue
1eissn
1055-7903issn
1095-9513pii
S1055790300908509journal_volume
19pub_type
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