Outbreeding and Inbreeding in a Zinc–Lead Mine Population of Armeria maritima

Lefebvre, Christian

doi:10.1038/243096a0

Cited by 15 publications

(6 citation statements)

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“…These results are surprising, considering that metallicolous populations are generally found to have higher selfing rates than their nonmetallicolous counterparts; see, for example, Anthoxanthum odoratum and Agrostis capillaris , (Antonovics, 1968, 1972; McNeilly & Antonovics, 1968), Armeria maritima (Lefèbvre, 1970, 1973) and Arrhenatherum elatius (Cuguen et al ., 1989). Different mutually nonexclusive hypotheses have been put forward to explain these results.…”

Section: Discussionmentioning

confidence: 99%

“…In particular, metal‐tolerant ecotypes were generally found to be more self‐fertile than their nontolerant relatives. Self‐fertility was assumed to be an adaptation to limit gene flow from nontolerant populations or to ensure offspring production to the first rare colonizers of the strongly selective metalliferous areas (Antonovics, 1968, 1972; Antonovics et al ., 1971; Lefèbvre, 1970, 1973, Macnair, 1987; Ducousso et al ., 1990). Genetic differentiation among tolerant populations was higher compared with nonmetal‐tolerant ones possibly owing to founder effects coupled with severe selection on toxic soils (Vekemans & Lefèbvre, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Genetic structure and mating systems of metallicolous and nonmetallicolous populations of Thlaspi caerulescens

et al. 2003

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Summary• Genetic variation structure and breeding system were investigated in metallicolous (MET) and nonmetallicolous (NONMET) populations of the heavy-metal hyperaccumulator Thlaspi caerulescens from Belgium, Luxembourg and the French Mediterranean region.• Allozyme variation showed a clear differentiation between the two ecotypes in Belgium and Luxembourg but not in southern France, in line with the lower degree of geographical isolation between the two ecotypes in this region.• In both regions inbreeding coefficient ( F IS ) of NONMET populations was significantly higher compared to MET populations. Pollen/Ovule ratios were significantly higher in MET compared with NONMET populations.• These results suggest that NONMET populations of T. caerulescens are more selffertile than their MET counterparts. This contrasts with earlier studies on other metal-tolerant species in which selfing rates were higher in MET populations. This pattern may be explained by the fact that both ecotypes are not in sympatry in the populations studied, and therefore reproductive isolation has not been selected to maintain the adaptations to metal-contaminated soils. In addition, higher selfing rates in NONMET populations may have evolved as a mechanism of reproductive assurance, because these populations generally are at low densities.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Genetic structure and mating systems of metallicolous and nonmetallicolous populations of Thlaspi caerulescens

et al. 2003

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“…In addition, after the initial results of Antonovics (1968) , replicated by Cuguen et al. (1989) and Lefèbvre (1970) (but see Lefèbvre, 1973 , 1976 ; Dulya and Mikryukov, 2015 ), the accumulated empirical evidence did not provide overall support to the idea of a general and strong association between selfing and plant local adaptation (for two meta-analyses, see Leimu and Fischer, 2008 ; Hereford, 2010 ).…”

Section: Introductionmentioning

confidence: 92%

Lower selfing rates in metallicolous populations than in non-metallicolous populations of the pseudometallophyteNoccaea caerulescens(Brassicaceae) in Southern France

Mousset

David

Petit

et al. 2016

Ann Bot

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Background and Aims The pseudometallophyte Noccaea caerulescens is an excellent model to study evolutionary processes, as it grows both on normal and on heavy-metal-rich, toxic soils. The evolution and demography of populations are critically impacted by mating system and, yet, information about the N. caerulescens mating system is limited.Methods Mean selfing rates were assessed using microsatellite loci and a robust estimation method (RMES) in five metallicolous and five non-metallicolous populations of N. caerulescens in Southern France, and this measure was replicated for two successive reproductive seasons. As a part of the study, the patterns of gene flow among populations were analysed. The mating system was then characterized at a fine spatial scale in three populations using the MLTR method on progeny arrays.Key Results The results confirm that N. caerulescens has a mixed mating system, with selfing rates ranging from 0·2 to 0·5. Selfing rates did not vary much among populations within ecotypes, but were lower in the metallicolous than in the non-metallicolous ecotype, in both seasons. Effective population size was also lower in non-metallicolous populations. Biparental inbreeding was null to moderate. Differentiation among populations was generally high, but neither ecotype nor isolation by distance explained it.Conclusions The consequences of higher selfing rates on adaptation are expected to be weak to moderate in non-metallicolous populations and they are expected to suffer less from inbreeding depression, compared to metallicolous populations.

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“…The species is highly variable morphologically and thus numerous intraspecific classifications have been elaborated for the taxon. In most of Europe it is an obligatory outbreeding species with a dimorphic incompatibility system, but this can break down, leading to the emergence of facultative selffertile plants (Baker 1966;Lefèbvre 1973Lefèbvre , 1976Kornaś & Medwecka-Kornaś 2002), as found in some European M populations (Lefèbvre 1972(Lefèbvre , 1976Richards et al 1989;Vekemans et al 1992after Lauranson et al 1995 and influencing their genetic variability.…”

Section: Study Speciesmentioning

confidence: 99%

Morphological and genetic distinctiveness of metallicolous and non‐metallicolous populations of Armeria maritima s.l. (Plumbaginaceae) in Poland

et al. 2012

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Patterns of morphological, genetic and epigenetic variation (DNA methylation pattern) were investigated in metallicolous (M) and non-metallicolous (NM) populations of Armeria maritima. A morphological study was carried out using plants from six natural populations grown in a greenhouse. Morphological variation was assessed using seven traits. On the basis of this study, three representative populations were selected for molecular analyses using metAFLP to study sequence- and methylation-based DNA variation. Only one morphological trait (length of outer involucral bracts) was common to both metallicolous populations studied; however, the level of variation was sufficient to differentiate between M and NM populations. Molecular analyses showed the existence of naturally occurring epigenetic variation in A. maritima populations, as well as structuring into distinct between and within population components. We show that patterns of population genetic structure differed depending on the information used in the study. Analysis of sequence-based information data demonstrates the presence of three well-defined and genetically differentiated populations. Methylation-based data show that two major groups of individuals are present, corresponding to the division into M and NM populations. These results were confirmed using different analytical approaches, which suggest that the DNA methylation pattern is similar in both M populations. We hypothesise that epigenetic processes may be involved in microevolution leading to development of M populations in A. maritima.

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Outbreeding and Inbreeding in a Zinc–Lead Mine Population of Armeria maritima

Cited by 15 publications

References 4 publications

Genetic structure and mating systems of metallicolous and nonmetallicolous populations of Thlaspi caerulescens

Genetic structure and mating systems of metallicolous and nonmetallicolous populations of Thlaspi caerulescens

Lower selfing rates in metallicolous populations than in non-metallicolous populations of the pseudometallophyteNoccaea caerulescens(Brassicaceae) in Southern France

Morphological and genetic distinctiveness of metallicolous and non‐metallicolous populations of Armeria maritima s.l. (Plumbaginaceae) in Poland

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