Population differentiation inCollinsia vernaNuttal (Scrophulariaceae): a multifaceted approach

✍ Scribed by J. K. Greenlee; K. S. Rai

• Book ID: 104630645
• Publisher: Springer Netherlands
• Year: 1986
• Tongue: English
• Weight: 734 KB
• Volume: 71
• Category: Article
• ISSN: 0016-6707
• DOI: 10.1007/bf00123233

✦ Synopsis

Three species of Collinsia (commonly called Blue-eyed Mary, Innocence, Chinese Houses) including 12 populations of C. verna were examined for genetic variability and differentiation using three investigative techniques: enzyme electrophoresis, chiasma frequencies, and morphological measurements. Analysis of isozyme data showed higher heterozygosity was maintained in the C. verna populations (previously reported to be self pollinating) than in C. heterophylla and C. tinctoria, which are outcrossers. C. heterophylla and C. tinctoria were separated by a significant genetic distance from each other and especially from C. verna. Within C verna isozyme, morphological, and chiasma frequency analyses separated the populations into subsets showing some geographical trends, possibly influenced by water dispersal of seeds. High genetic variability was maintained and differentiation has occured in the C. verna populations. The explanation may lie in a combination of factors associated with the 'heterozygosity paradox' including microgeographical influence and inappropriate mating system classification.