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Self-compatible sympatric Chamaecrista (Leguminosae-Caesalpinioideae) species present different interspecific isolation mechanisms depending on their phylogenetic proximity

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Abstract

The mating system of seven sympatric taxa of Chamaecrista occurring in the Chapada Diamantina Mountains, northeastern Brazil, was studied to determine the occurrence of self-incompatibility and interspecific genetic isolation mechanisms within the group. Self- and cross-pollination experiments and inter-taxon bidirectional crosses were performed. All of the populations were self-compatible and showed high percentages of spontaneous seed abortion on both self- and cross-pollinated fruits. The inter-incompatibility among the taxa of Chamaecrista is directed by different mechanisms depending on their degrees of phylogenetic proximity. In the crosses between closely related taxa (same clade), seed inviability was observed in the crossing pairs C. desvauxii var. graminea × C. desvauxii var. latistipula, and C. chapadae × C. glaucofilix. Inter-compatibility between species of the same clade occurred in C. blanchetii and C. confertiformis, with the formation of viable seeds. Pre-zygotic gametophytic reproductive isolation was observed among taxa of different clades, without penetration of the pollen tube into the ovule, or post-zygotic isolation through embryo or endosperm inviability, with abortion of the seeds. Inter-incompatibility represents an important factor in reproductive isolation and thus in the maintenance of the genetic identity of sympatric taxa that flower in synchrony and share pollinators.

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Acknowledgments

The authors thank the staff of the Mucugê Municipal Park for their assistance. This work was supported by a grant from the Fundação de Apoio à Pesquisa do Estado da Bahia (FAPESB). CBNC received a scholarship from the Conselho Nacional de Desenvolvimento Científico and Tecnológico (CNPq), and ELB and LPQ were supported by grants (PQ) from CNPq.

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  1. Instituto de Ciências Ambientais e Desenvolvimento Sustentável, Colegiado de Ciências Biológicas, Universidade Federal da Bahia, Rua Prof. José Seabra, Barreiras, Bahia, 47805-100, Brazil

    Cristiana B. N. Costa & Jorge A. S. Costa

  2. Departamento de Ciências Biológicas, Laboratório de Sistemática Molecular de Plantas, Universidade Estadual de Feira de Santana, Rodovia BR116 Km 03, Feira de Santana, Bahia, 44031-460, Brazil

    Luciano P. de Queiroz

  3. Centro de Ciências Naturais and Humanas, Universidade Federal do ABC, Rua Santa Adélia 166, Bangu, Santo André, São Paulo, 09210-170, Brazil

    Eduardo L. Borba

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  1. Cristiana B. N. Costa
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  2. Jorge A. S. Costa
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  3. Luciano P. de Queiroz
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  4. Eduardo L. Borba
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Correspondence to Cristiana B. N. Costa.

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Costa, C.B.N., Costa, J.A.S., de Queiroz, L.P. et al. Self-compatible sympatric Chamaecrista (Leguminosae-Caesalpinioideae) species present different interspecific isolation mechanisms depending on their phylogenetic proximity. Plant Syst Evol 299, 699–711 (2013). https://doi.org/10.1007/s00606-012-0752-z

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