Abstract
The genusFedia consists of three species (F. cornucopiae, F. graciliflora andF. pallescens) of winter annual herbs, endemic to the western Mediterranean Basin. The deciduous terminal fruits of these taxa are polymorphic in the development of their pericarp and/or calyx, and each population is dimorphic or more rarely trimorphic. The three main fruit types are dispersed in several manners, and are specialized for either epizoochory or myrmecochory. On the basis of our experimental study of dimorphic and trimorphic populations ofF. pallescens subsp.pallescens, a genetic model is presented in order to explain the control of this intrapopulational polymorphism. It is postulated that two diallelic loci are tightly linked on the same chromosome in a functional supergene. One allele of each locus displays a dominance effect in the heterozygous state. Within the four possible homologous allelic segments, only two are present in the dimorphic populations, three in the trimorphic ones, and are otherwise associated in diverse combinations in the remaining taxa of the genus. Similar examples of fruit polymorphism are already documented in the tribeValerianeae, subtribeFediinae. The hypothesis is put forward that this fruit polymorphism is a synapomorphy for the subtribe.
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Xena de Enrech, N., Mathez, J. Genetic control of fruit polymorphism in the GenusFedia (Valerianaceae) in the light of dimorphic and trimorphic populations ofF. pallescens . Pl Syst Evol 210, 199–210 (1998). https://doi.org/10.1007/BF00985668
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DOI: https://doi.org/10.1007/BF00985668