Bidirectional history of hybridization in California wild radish, Raphanus sativus (Brassicaceae), as revealed by chloroplast DNA

The evolutionary processes that take place in invasive plant populations are not well documented or understood. Interspecific hybridization between cultivated radish (Raphanus sativus) and R. raphanistrum is known to be responsible for the origin of the invasive California wild radish, but little is...

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Bibliographic Details
Published in:American journal of botany 2008-11, Vol.95 (11), p.1437-1442
Main Authors: Ridley, Caroline E, Kim, Seung-Chul, Ellstrand, Norman C
Format: Article
Language:English
Subjects:
Botany
Chlorophyll
cpDNA
Crops
Deoxyribonucleic acid
DNA
Ecological genetics
Evolution
Evolutionary genetics
Flowers & plants
Genetic hybridization
Genetics
haplotype
Haplotypes
Hybridity
Hybridization
intergenic region trnL‐rpl32
Invasive species
multiple introductions
Nonnative species
Plants
Radishes
Raphanus
Vegetables
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Summary:The evolutionary processes that take place in invasive plant populations are not well documented or understood. Interspecific hybridization between cultivated radish (Raphanus sativus) and R. raphanistrum is known to be responsible for the origin of the invasive California wild radish, but little is known about the nature of the hybridization events that produced the hybrid-derived lineage. We analyzed the trnL-rpl32 intergenic region of chloroplast DNA (cpDNA) obtained from 37 cultivated radish individuals from four different cultivars, 53 R. raphanistrum individuals from six European populations and 104 California wild radish individuals from 11 populations covering its entire range throughout the state. We found that cultivated radish and R. raphanistrum shared no cpDNA haplotypes but that they both shared haplotypes with California wild radish, evidence for bidirectional hybridization between the progenitor species in the creation of the California lineage. We also found evidence that multiple cultivars and multiple European source populations contributed to the diversity of cpDNA haplotypes within California. Studies like this will continue to be important for our understanding of the origin of invasive populations and the mechanisms by which they succeed.
ISSN:0002-9122
1537-2197
DOI:10.3732/ajb.0800119