A secondary hybrid zone between diploid Dactylorhiza incarnata ssp. cruenta and allotetraploid D. lapponica (Orchidaceae)

Article Abstract:

Interploidal gene flow and introgression in a hybrid zone between diploid Dactylorhiza incarnata ssp. cruenta and its putative allotetraploid derivative D. lapponica is assessed. Allozyme segregation patterns in D. lapponica supported an allopolypoid origin, although unbalanced genotypes suggested rare pairings between homoeologous chromosomes.

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Interspecific differentiation and hybridization in Vanilla species (Orchidaceae)

Article Abstract:

This article presents genetic analysis of three species of vanilla orchids indistinguishable by vegetative characteristics. Results reveal that polymorphic enzyme profiles are similar among the species but there are differences in allele frequencies between species, leading to different genotypic compositions.

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Differential barrier strength and allele frequencies in hybrid zones maintained by sex-biased hybrid incompatibilities

Article Abstract:

Several modular studies of the hybrid zones are conducted to explain the significance of the sex-based hybrid heterogametic and homogametic incompatibilities. These incompatibilities are found to be extremely helpful in maintaining the differential barrier strength and allele frequencies in the hybrid zones.

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