Isabel Mateu-Andrés

Population subdivision and genetic diversity in two narrow endemics of Antirrhinum L.

Genetic diversity and its partition within and among populations and families of two species of Antirrhinum L., A. charidemi Lange and A. valentinum F.Q., have been studied. Both species are narrow‐range endemics, self‐incompatible, ecologically specialized and form small isolated populations. Despite these similarities, the species differ markedly in the distribution of genetic diversity. In A. valentinum, 61.64% of the total variation was distributed among populations, whereas in A. charidemi it was only 8.55%. A. charidemi showed little population divergence (GST = 0.0542) relative to A. valentinum (GST = 0.4805). In neither species was within‐population genetic diversity correlated with population size, nor were there significant correlations between genetic and geographical distances. These results are discussed in relation to differences in flowering time and habitat continuity. They suggest that caution should be taken when making generalizations about levels of genetic variation and patterns of plant reproduction, life history and geographical distribution.

Allozyme and chloroplast DNA variation in island and mainland populations of the rare Spanish endemic, Silene hifacensis (Caryophyllaceae)

Silene hifacensis is a narrowly endemicplant, restricted to a few small populations onlimestone cliffs in the Spanish province ofAlicante and on the Balearic island of Ibiza.The species was collected to extinction in itsoriginal mainland location by the early 20thcentury. Attempts have been made to reintroduceS. hifacensis to this area butconservation efforts are limited by a lack ofinformation on the geographic structure ofgenetic variation in the species. We usednuclear (allozyme) and chloroplast DNA (cpDNA)PCR/RFLP markers to investigate the structureof genetic variation in 2 mainland and 6 Ibizanpopulations. Levels of allozyme variation werelow, with a mean of 2 alleles per polymorphiclocus. Mean (over polymorphic loci) totalallozyme diversity (Htot) was 0.203 and meanwithin-population diversity (Hpop) was 0.085. Mostdiversity was explained by thebetween-population diversity component (Gpop.reg =57%). Both mainland populations showedallozyme fixation. Three composite cpDNAhaplotypes were identified. The first is uniqueto a mainland population that is alsoallozymically distinct from all the otherpopulations. The second haplotype is found inthe other mainland population and one Ibizanpopulation: these two populations areallozymically identical. The remaining Ibizanpopulations contain the third haplotype. Thegeographic distribution of allozymes and cpDNAhaplotypes is discussed in terms of populationhistory, dispersal and, speculatively, in termsof the possibility that there has beenundocumented translocation of material betweenpopulations.

Reproductive System in the Iberian Endangered Endemic Antirrhinum Valentinum F.Q. (Antirrhineae, Scrophulariaceae): Consequences for Species Conservation

A comparison of four pollination treatments revealed that Antirrhinum valentinum is self‐incompatible but shows low levels of spontaneous self‐fertility. Seed sets, after hand cross‐pollination and spontaneous self‐fertilization, were significantly fewer than in control flowers, but fruit and seed mass were not significantly different. Pollen tube growth was slower after selfing than crossing, being arrested in the stigmata or in the upper part of the style. Multilocus outcrossing rates (tm) were high and \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape

Microsporogenesis in three wild species of the genus Antirrhinum L. (A. litigiosum Pau, A. pulverulenthum Lazaro and A. subbaeticum Güemes, Sánchez and Mateu).

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Cytological characteristics of reciprocal interspecific F1 hybrids between the wild species Antirrhinum litigiosum Pau and Antirrhinum pulverulentum Lazaro

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Allozymic variation and divergence in three species of Antirrhinum L. (Scrophulariaceae‐Antirrhineae)

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