Self-compatible sympatric Chamaecrista (Leguminosae-Caesalpinioideae) species present different interspecific isolation mechanisms depending on their phylogenetic proximity
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- 作者：Cristiana B. N. Costa (1)
Jorge A. S. Costa (1)
Luciano P. de Queiroz (2)
Eduardo L. Borba (3) - 关键词：Campo Rupestre ; Chamaecrista ; Post ; zygotic barriers ; Reproductive isolation ; Sympatric species
- 刊名：Plant Systematics and Evolution
- 出版年：2013
- 出版时间：April 2013
- 年：2013
- 卷：299
- 期：4
- 页码：699-711
- 全文大小：461KB
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Jorge A. S. Costa (1)
Luciano P. de Queiroz (2)
Eduardo L. Borba (3)
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
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
3. Centro de Ciências Naturais and Humanas, Universidade Federal do ABC, Rua Santa Adélia 166, Bangu, Santo André, S?o Paulo, 09210-170, Brazil - ISSN：1615-6110
文摘
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.