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Annals of Botany 85: 7-12, 2000
© 2000 Annals of Botany Company

Isozyme Evidence for Natural Hybridization in Phlomis (Lamiaceae): Hybrid Origin of the RareP.xmargaritae

A. APARICIO+, R. G. ALBALADEJO, M. PORRAS and G. CEBALLOS

Departamento de Biología Vegetal y Ecología, Facultad de Farmacia, Universidad de Sevilla, 41012, Sevilla, Spain Departamento de Botánica y Recursos Forestales, C. Marcelo Spinola, Universidad de Gales, 41086, Sevilla, Spain

March 31, 1999 ; August 25, 1999 . September 13, 1999

Phlomisxmargaritae is a rare and sterile hybrid taxon found in a single endangered population in southern Spain. It was previously described as a morphologically intermediate hybrid, putatively between Phlomis purpurea and P. composita. The present study used allozymes as molecular markers to assess the hybrid identity ofP.xmargaritae . Ten putative loci from seven enzyme systems were resolved: five were monomorphic and fixed across all taxa studied and the rest (Aat-1, Aat-2, 6-Pgdh-2, Pgi and Pgm) were polymorphic in at least one taxon. The two parental taxa are fixed for different alleles at 6-Pgdh-2 and show distinct allelic frequency differences for four other loci. Phlomisxmargaritae displays fixed heterozygous phenotypes for four of the five polymorphic loci, these being composed of combinations of the alleles found in the parental taxa. No unique alleles were detected in P.xmargaritae. We conclude that this taxon is of hybrid origin and confirm the identity of the parental taxa involved. It is further suggested that this population is composed of individuals that are recent F1hybrids that have not undergone backcrossing or introgression. Global conservation measures are necessary for the whole hybrid system in this location since further continuous assessment could reveal the evolutionary input of hybridization in Phlomis.Copyright 2000 Annals of Botany Company

Endangered species, genetic diversity, isozyme variation, hybrid species, Phlomisxmargaritae, plant conservation, population genetics, Lamiaceae, Spain.


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R. G. Albaladejo and A. Aparicio
Population Genetic Structure and Hybridization Patterns in the Mediterranean Endemics Phlomis lychnitis and P. crinita (Lamiaceae)
Ann. Bot., October 1, 2007; 100(4): 735 - 746.
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