Molecular phylogenetic analysis of the evolution of complex hybridity in Isotoma petraea

Bussell, John D., Waycott, Michelle, Chappill, Jennifer A., and James, Sidney H. (2002) Molecular phylogenetic analysis of the evolution of complex hybridity in Isotoma petraea. Evolution, 56 (6). pp. 1296-1302.

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Complex hybridity is a rare diploid genetic system of plants, extensively characterized in Oenothera, in which heterozygosity for one or more reciprocal translocations is maintained by means of autogamy and a balanced lethal system. It is visible at metaphase I of meiosis as rings or chains of chromosomes held together by terminalized chiasmata. Phylogenetic analysis based on 274 random amplified polymorphic DNA markers showed that in the Australian endemic Isotoma petraea (Lobeliaceae) the genetic system had a single origin, as a ring-of-six, in the Pigeon Rock population. It subsequently spread to other populations to produce hybrids incorporating additional chromosomes into the rings. Our research supports the suggestion that complex hybridity is an evolutionary response to intense inbreeding and selected because it allows masking of accumulated deleterious alleles.

Item ID: 13519
Item Type: Article (Research - C1)
ISSN: 1558-5646
Keywords: complex hybridity; deleterious recessive mutations; genetic system evolution; isotoma petraea
Date Deposited: 22 Dec 2010 07:04
FoR Codes: 06 BIOLOGICAL SCIENCES > 0699 Other Biological Sciences > 069999 Biological Sciences not elsewhere classified @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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