Indehiscent sporangia enable the accumulation of local fern diversity at the Qinghai-Tibetan Plateau
| Autor: | Lijuan He, Xian-Chun Zhang, Zhiqiang Wu, Harald Schneider, Li Wang, Qiao-Ping Xiang |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Chloroplast DNA
DNA Plant Evolution Molecular Sequence Data Himalaya Population Low-copy nuclear genes Incongruent phylogenetic hypotheses Self-fertilization Biology Dehiscence Tibet LFY Species Specificity Reticulate evolution Phylogenetics Botany Lepisorus clathratus QH359-425 Chloroplast capture Genome Chloroplast education Phylogeny Phylogenetic analyses Ecology Evolution Behavior and Systematics Cell Nucleus education.field_of_study Geography Phylogenetic tree Sporangia Altitude Sporangium fungi DNA Chloroplast Genetic Variation Sequence Analysis DNA biology.organism_classification PgiC Genetics Population Haplotypes Ferns Fern Research Article |
| Zdroj: | BMC Evolutionary Biology, Vol 12, Iss 1, p 158 (2012) BMC Evolutionary Biology |
| ISSN: | 1471-2148 |
| DOI: | 10.1186/1471-2148-12-158 |
| Popis: | Background Indehiscent sporangia are reported for only a few of derived leptosporangiate ferns. Their evolution has been likely caused by conditions in which promotion of self-fertilization is an evolutionary advantageous strategy such as the colonization of isolated regions and responds to stressful habitat conditions. The Lepisorus clathratus complex provides the opportunity to test this hypothesis because these derived ferns include specimens with regular dehiscent and irregular indehiscent sporangia. The latter occurs preferably in well-defined regions in the Himalaya. Previous studies have shown evidence for multiple origins of indehiscent sporangia and the persistence of populations with indehiscent sporangia at extreme altitudinal ranges of the Qinghai-Tibetan Plateau (QTP). Results Independent phylogenetic relationships reconstructed using DNA sequences of the uniparentally inherited chloroplast genome and two low-copy nuclear genes confirmed the hypothesis of multiple origins of indehiscent sporangia and the restriction of particular haplotypes to indehiscent sporangia populations in the Lhasa and Nyingchi regions of the QTP. In contrast, the Hengduan Mountains were characterized by high haplotype diversity and the occurrence of accessions with and without indehiscent sporangia. Evidence was found for polyploidy and reticulate evolution in this complex. The putative case of chloroplast capture in the Nyingchi populations provided further evidence for the promotion of isolated but persistent populations by indehiscent sporangia. Conclusions The presented results confirmed the hypothesis that indehiscent sporangia promote the establishment of persistent population in different regions of the QTP. These results are consistent with the expectations of reproductive reassurance by promotion of self-fertilization that played a critical role in the assembly of populations in isolated locations and/or extreme habitats. |
| Databáze: | OpenAIRE |
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