Effects of apomixis and polyploidy on diversification and geographic distribution in<i>Amelanchier</i>(Rosaceae)

Burgess, Michael B.; Cushman, Kevin R.; Doucette, Eric T.; Talent, Nadia; Frye, Christopher T.; Campbell, Christopher S.

doi:10.3732/ajb.1400113

Cited by 41 publications

(39 citation statements)

References 98 publications

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“…Importantly, the species richness of Rosaceae could be partly related to polyploidization and species radiation in the family history, with evidence for polyploidy events in the two larger subfamilies (Talent and Dickinson 2005; Vamosi and Dickinson 2006; Dickinson et al 2007; Rousseau-Gueutin et al 2009; Lo et al 2010; Schmidt-Lebuhn et al 2010; Considine et al 2012; Burgess et al 2014; Fougere-Danezan et al 2015). In particular, the ancestor of Maleae was proposed to be a hybrid of the ancestors of the Spiraeoideae and the Amygdaleae, in part because all Maleae members have a base chromosome number of 17, with an exception of an early branching genus Vauquelinia having a base chromosome number of 15, whereas the putative parents have chromosome number of 9 and 8 for Spiraeoideae and Amygdaleae, respectively (Robertson et al 1991).…”

Section: Introductionmentioning

confidence: 99%

Evolution of Rosaceae Fruit Types Based on Nuclear Phylogeny in the Context of Geological Times and Genome Duplication

et al. 2016

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Fruits are the defining feature of angiosperms, likely have contributed to angiosperm successes by protecting and dispersing seeds, and provide foods to humans and other animals, with many morphological types and important ecological and agricultural implications. Rosaceae is a family with ∼3000 species and an extraordinary spectrum of distinct fruits, including fleshy peach, apple, and strawberry prized by their consumers, as well as dry achenetum and follicetum with features facilitating seed dispersal, excellent for studying fruit evolution. To address Rosaceae fruit evolution and other questions, we generated 125 new transcriptomic and genomic datasets and identified hundreds of nuclear genes to reconstruct a well-resolved Rosaceae phylogeny with highly supported monophyly of all subfamilies and tribes. Molecular clock analysis revealed an estimated age of ∼101.6 Ma for crown Rosaceae and divergence times of tribes and genera, providing a geological and climate context for fruit evolution. Phylogenomic analysis yielded strong evidence for numerous whole genome duplications (WGDs), supporting the hypothesis that the apple tribe had a WGD and revealing another one shared by fleshy fruit-bearing members of this tribe, with moderate support for WGDs in the peach tribe and other groups. Ancestral character reconstruction for fruit types supports independent origins of fleshy fruits from dry-fruit ancestors, including the evolution of drupes (e.g., peach) and pomes (e.g., apple) from follicetum, and drupetum (raspberry and blackberry) from achenetum. We propose that WGDs and environmental factors, including animals, contributed to the evolution of the many fruits in Rosaceae, which provide a foundation for understanding fruit evolution.

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Section: Introductionmentioning

confidence: 99%

Evolution of Rosaceae Fruit Types Based on Nuclear Phylogeny in the Context of Geological Times and Genome Duplication

et al. 2016

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“…In the Rosaceae family, where Crataegus belongs, diploids are mostly sexual, as observed by FCM in Amelanchier Medik. [98], Potentilla L. s.l. [82], Rubus L. [25,99], and Sorbus [100], but few exceptions were reported [e.g., 82,98].…”

Section: Seed-set Analysis and Reproductive Modes In Diploid Crataegumentioning

confidence: 99%

Breeding Systems in Diploid and Polyploid Hawthorns (Crataegus): Evidence from Experimental Pollinations of C. monogyna, C. subsphaerica, and Natural Hybrids

Vašková

Kolarčik

2019

Forests

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Background and Objectives: Polyploidisation and frequent hybridisation play an important role in speciation processes and evolutionary history and have a large impact on reproductive systems in the genus Crataegus. Reproductive modes in selected diploid and polyploid taxa in eastern Slovakia were investigated and analysed for the first time. Materials and Methods: Diploid, triploid, and tetraploid hawthorns were tested for self-pollination, self-compatibility, and self-fertilisation. Pollination experiments were performed within and between diploid and triploid species to determine the possibilities and directions of pollen transfer under natural conditions. Seeds from crossing experiments and open pollinations were analysed using the flow cytometric seed screen method. Results: These experiments demonstrated that sexual reproduction, cross-pollination, and self-incompatibility are typical of the diploid species Crataegus monogyna and C. kyrtostyla. Seeds produced by self-fertile tetraploid C. subsphaerica were derived from both meiotically reduced and unreduced megagametophytes. Conclusions: Experimental results concerning triploid C. subsphaerica and C. laevigata × C. subsphaerica are ambiguous but suggest that seeds are almost exclusively created through apomixis, although a few sexually generated seeds were observed. In the genus Crataegus, pseudogamy is a common feature of polyploid taxa, as in all cases pollination is essential for regular seed development. Research Highlights: We suggest that all studied Crataegus taxa produce reduced pollen irrespective of ploidy level. Moreover, we emphasise that triploids produce apparently aneuploid pollen grains as a result of irregular meiosis. They are also capable of utilising pollen from 2x, 3x, or 4x donors for pseudogamous formation of endosperm.

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“…Plants that reproduce by gametophytic apomixis (agamospermy; asexual seed production), including Amelanchier , present difficult species‐delimitation problems (Stebbins and Babcock, 1939; Gustafsson, 1946–1947; Stebbins, 1950; Grant, 1981; Stace, 1998; Dickinson, 1999; Rieseberg and Willis, 2007; Dickinson et al, 2008; Burgess et al, 2014; Campbell et al, 2014; Zarrei et al, 2014). Through apomixis, ecologically successful polyploid genotypes can proliferate into morphologically and genetically uniform microspecies (Babcock and Stebbins, 1938; Gustafsson, 1946–1947; Stebbins, 1950; Grant, 1981).…”

Section: Sample Sizes and Number Of Sequences For Diploids Of Amelancmentioning

confidence: 99%

“…While Amelanchier polyploids are almost exclusively apomictic, diploids are almost exclusively sexual (Campbell et al, 1985, 1987; Weber and Campbell, 1989; Campbell and Wright, 1996; Dibble et al, 1998; Burgess et al, 2014). Diploids are known from six eastern North American species, four western North American species, and three Old World species (Fig.…”

Section: Sample Sizes and Number Of Sequences For Diploids Of Amelancmentioning

confidence: 99%

Understanding diploid diversity: A first step in unraveling polyploid, apomictic complexity in Amelanchier

Burgess

Cushman

Doucette

et al. 2015

American J of Botany

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Effects of apomixis and polyploidy on diversification and geographic distribution inAmelanchier(Rosaceae)

Cited by 41 publications

References 98 publications

Evolution of Rosaceae Fruit Types Based on Nuclear Phylogeny in the Context of Geological Times and Genome Duplication

Evolution of Rosaceae Fruit Types Based on Nuclear Phylogeny in the Context of Geological Times and Genome Duplication

Breeding Systems in Diploid and Polyploid Hawthorns (Crataegus): Evidence from Experimental Pollinations of C. monogyna, C. subsphaerica, and Natural Hybrids

Understanding diploid diversity: A first step in unraveling polyploid, apomictic complexity in Amelanchier

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