Evidence for Hybrid Origin and Segmental Allopolyploidy in Eutetraploid and Aneutetraploid <i>Lepisorus thunbergianus</i> (Polypodiaceae)

Shinohara, Wataru; Ushio, Yutaka; Seo, Akihiro; Nakato, Narumi; Kono, Michihito; Kudoh, Hiroshi; Tobe, Hiroshi; Murakami, Noriaki

doi:10.1600/036364410790862498

Cited by 17 publications

(16 citation statements)

References 43 publications

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“…In many well characterized apomictic species, apomixis is often associated with hybridization and allopolyploidy (Asker and Jerling 1992). The fixed heterozygous isozyme profiles observed in this study attests the hybrid genomic nature of fonio species and suggests that the tetraploid level of these crops (and thus their two wild progenitors) is of allopolyploid origin, as it has also been recently demonstrated by Shinohara et al (2010) in Lepisorus thunbergianus Ching (Polypodiaceae). Questions nonetheless remain on the identities of the genome contributors of these tetraploid cultivated/wild progenitor complexes.…”

Section: Reproductive System In Fonio Milletssupporting

confidence: 74%

Reproductive System and Molecular Phylogenetic Relationships of Fonio Millets (Digitaria spp., Poaceae) with Some Polyploid Wild Relatives

Adoukonou‐Sagbadja

Wagner

Ordon

et al. 2010

Tropical Plant Biol.

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Fonio millets (Digitaria exilis, D. iburua) are minor but important indigenous cereals in the semiarid areas of West-Africa. Recent interest in breeding strategies for these crops requires a better understanding of their biology and genetics. Amplified Fragment Length Polymorphism (AFLP) markers were employed to assess the phylogenetic relationships among cultivated fonio species and some polyploid wild relatives and examine proposed hypotheses on fonio ancestry. The AFLP analysis was found quite suitable for identifying each species. A very strong genetic affinity (over 92% similarity) was detected between the wild D. longiflora and D. ternata and the cultivated D. exilis and D. iburua, respectively. These data provided additional molecular evidence supporting the previous view of direct domestication of fonio millets from these two wild species. High genetic divergences were expectedly found between fonio species and the other taxonomically distant Digitaria taxa investigated. The results also revealed D. ciliaris and D. sanguinalis as separate species sharing close ancestry. Selfing experiments and subsequent progeny analyses using three isozymes supplemented by AFLPs were further conducted to determine the reproductive system in fonio millets. The results revealed apomixis as absolute mode of reproduction of these crops, except D. exilis in which 2% residual sexuality was detected. Additional data documented on seed set and pollen viability suggested that apomixis in fonio would be of pseudogamous type. The data also revealed fonio crops as highly self-compatible and of allopolyploid origin. This study adds new information about the reproductive system and the evolution of fonio, contributing to the knowledge on their biology, and thus providing useful subsides for future genetic improvement of these valuable crops. Abbreviations APSAmmonium persulfate AFLP Amplified fragment length polymorphism BS Bootstrap support CTAB Cetyl trimethyl-ammonium bromide EDTA Ethylene diamine tetra-acetic acid PCR Polymerase chain reaction PGI Phosphoglucoisomerase PGM Phosphoglucomutase NJ Neighbor-Joining RAPD Random amplified polymorphic DNA Communicated by: Desiree M. Hautea Electronic supplementary material The online version of this article (

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Section: Reproductive System In Fonio Milletssupporting

confidence: 74%

Reproductive System and Molecular Phylogenetic Relationships of Fonio Millets (Digitaria spp., Poaceae) with Some Polyploid Wild Relatives

Adoukonou‐Sagbadja

Wagner

Ordon

et al. 2010

Tropical Plant Biol.

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“…These studies provided us with a rather comprehensive understanding of the species diversity and phylogenetic structure of this genus, although some uncertainty still exists concerning the number of species in this lineage that originated by primary speciation (speciation via cladogenese). Relatively little evidence for secondary speciation (speciation via polyploidy) was reported for this genus [52]. Rates of secondary speciation cannot be estimated using the established phylogenetic methods of diversification rate analyses because these analyses incorporate only the rate of primary speciation, meaning speciation by lineages splits via cladogenese events.…”

Section: Introductionmentioning

confidence: 99%

The rise of the Himalaya enforced the diversification of SE Asian ferns by altering the monsoon regimes

et al. 2012

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BackgroundThe rise of high mountain chains is widely seen as one of the factors driving rapid diversification of land plants and the formation of biodiversity hotspots. Supporting evidence was reported for the impact of the rapid rise of the Andean mountains but this hypothesis has so far been less explored for the impact of the “roof of the world”. The formation of the Himalaya, and especially the rise of the Qinghai–Tibetan Plateau in the recent 20 million years, altered the monsoon regimes that dominate the current climates of South East Asia. Here, we infer the hypothesis that the rise of Himalaya had a strong impact on the plant diversity in the biodiversity hotspot of the Southwest Chinese Mountains.ResultsOur analyses of the diversification pattern of the derived fern genus Lepisorus recovered evidence for changes in plant diversity that correlated with the strengthening of South East Asian monsoon. Southwest China or Southwest China and Japan was recovered as the putative area of origin of Lepisorus and enhancing monsoon regime were found to shape the early diversification of the genus as well as subsequent radiations during the late Miocene and Pliocene.ConclusionsWe report new evidence for a coincidence of plant diversification and changes of the climate caused by the uplift of the Himalaya. These results are discussed in the context of the impact of incomplete taxon sampling, uncertainty of divergence time estimates, and limitations of current methods used to assess diversification rates.

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“…This hypothesis is also supported by the high frequency of trivalent formation in the meiosis as reported in recent studies (Hwang et al, 2012;Liu and Jia, 2013). Codominant genetic markers (such as allozymes and microsatellites) have been proved very useful to infer the mode of polyploidization in plants, mainly through the observation of banding patterns (Landergott et al, 2006;López-Pujol et al, 2004;Palop-Esteban et al, 2011;Shinohara et al, 2010). If the triploid cytotype of L. lancifolium is an autopolyploid, we expect triploids to have a subset of the alleles present in diploid populations, and no evidence of fixed heterozygosity.…”

Section: Introductionmentioning

confidence: 99%

Polyploidy in Lilium lancifolium: Evidence of autotriploidy and no niche divergence between diploid and triploid cytotypes in their native ranges

Chung

López‐Pujol

Chung

et al. 2015

Flora - Morphology, Distribution, Functional Ecology of Plants

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a b s t r a c tLilium lancifolium, the tiger lily, constitutes a polyploid complex with both diploids (reproduced by seeds and bulbils) and triploids (propagated exclusively via bulbils). An autopolyploid origin for the triploid forms has been previously suggested based on classical cytogenetics, chromosome mapping techniques, ecological data, and geographic distribution in their native range (Korea and the Japanese Tsushima Island). Using 13 allozyme loci, we comparatively assessed clonal structure and levels of genetic diversity in four diploid and 11 triploid populations in South Korea to test the autopolyploid origin of the triploid cytotype and to infer which seedling recruitment strategy is operating within the diploid populations. We also employed ecological niche modeling and multivariate analysis to determine whether triploids of L. lancifolium occupy different and broader niches to those of diploids in Korea and Tsushima Island. The diploids harbored higher levels of within-population genetic diversity than triploids, and allele profiles found in triploids were exactly subsets of those in diploids. Repeated seedling recruitment was inferred for the diploids, whereas all the studied triploid populations were monoclonal since there is no seedling (sexual) recruitment. Although we found no niche divergence between cytotypes of L. lancifolium, the triploids have a broader niche breadth. Genetic data further confirm the autotriploid origin of L. lancifolium, and the lack of a clear, strong evidence for niche divergence between cytotypes of L. lancifolium supports the view that ecological differentiation is not a pre-requisite for the establishment of new polyploid lineages.

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Evidence for Hybrid Origin and Segmental Allopolyploidy in Eutetraploid and Aneutetraploid Lepisorus thunbergianus (Polypodiaceae)

Cited by 17 publications

References 43 publications

Reproductive System and Molecular Phylogenetic Relationships of Fonio Millets (Digitaria spp., Poaceae) with Some Polyploid Wild Relatives

Reproductive System and Molecular Phylogenetic Relationships of Fonio Millets (Digitaria spp., Poaceae) with Some Polyploid Wild Relatives

The rise of the Himalaya enforced the diversification of SE Asian ferns by altering the monsoon regimes

Polyploidy in Lilium lancifolium: Evidence of autotriploidy and no niche divergence between diploid and triploid cytotypes in their native ranges

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