The protected tree Dimorphandra wilsonii (Fabaceae) is a population of inter-specific hybrids: recommendations for conservation in the Brazilian Cerrado/Atlantic Forest ecotone
| Autor: | Helena A. V. Souza, Myriam Heuertz, Maria Bernadete Lovato, Rafaela Cabral Marinho, José P. Lemos-Filho, Renata Santiago de Oliveira Buzatti, André Carneiro Muniz |
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| Přispěvatelé: | Pontifícia Universidade Católica de Minas Gerais (PUC Minas), Federal University of Uberlândia [Uberlândia] (UFU), Biodiversité, Gènes & Communautés (BioGeCo), Université de Bordeaux (UB)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), ANR-10-LABX-0025,CEBA,CEnter of the study of Biodiversity in Amazonia(2010) |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Conservation genetics Dimorphandra Population Plant Science Forests 010603 evolutionary biology 01 natural sciences 03 medical and health sciences Critically endangered Dimorphandra wilsonii Botany Ecotone education Hybridization 030304 developmental biology 0303 health sciences education.field_of_study Genetic diversity biology Cerrado Bayes Theorem Fabaceae Original Articles 15. Life on land biology.organism_classification Taxon Atlantic Forest [SDE]Environmental Sciences Brazil Microsatellite Repeats |
| Zdroj: | Ann Bot Annals of Botany Annals of Botany, Oxford University Press (OUP), 2020, 126 (1), pp.191-203. ⟨10.1093/aob/mcaa066⟩ |
| ISSN: | 1095-8290 0305-7364 |
| Popis: | Backgrounds and AimsDimorphandra wilsonii Rizzini, a critically endangered and protected tree, has a restricted distribution in the ecotone between the Cerrado and the Atlantic Forest in south-eastern Brazil. In this area, it co-occurs with D. mollis Benth., a common tree from the Cerrado, and D. exaltata Schott., a rare tree from the Atlantic Forest. Previous studies of D. wilsonii indicated heterozygosity excess at the individual level. Field observation of some intermediate phenotypes between D. wilsonii and both congeners suggests hybridization of D. wilsonii with D. mollis and/or D. exaltata. Here, we tested the hypothesis that D. wilsonii may have originated from hybridization between D. exaltata and D. mollis. We also performed cytogenetic analysis to examine if the heterozygosity excess could be explained by polyploidy in D. wilsonii.MethodsWe evaluated the genetic diversity and population structure of D. wilsonii using 11 nuclear simple sequence repeats (SSRs) genotyped in 152 individuals sampled across the taxon’s range. We performed comparative genetic analyses using overlapping SSR markers between D. wilsonii and previously published SSR data in D. mollis and D. exaltata to subsequently perform a series of allelic comparisons, multivariate and Bayesian analysis.Key ResultsOur results suggest that D. wilsonii individuals are most likely to correspond to F1 hybrids between D. exaltata and D. mollis. Cytogenetic analysis indicated that D. wilsonii is diploid with the same chromosome number as D. mollis (2n = 2x = 28).ConclusionsOur study raises questions about the taxonomic status and the evolutionary future of D. wilsonii. We suggest that the conservation and management strategy for D. wilsonii should be revised and that it should take into account both parental Dimorphandra species in the ecotone, with special emphasis on the threatened D. exaltata. Finally, this study highlights the value of genetic information for the design of conservation strategies. |
| Databáze: | OpenAIRE |
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