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

Abstract:

Phlomis×margaritae 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.×margaritae . 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. Phlomis×margaritae 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.×margaritae. We conclude …

Año de publicación:

2000

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