Breeding systems, hybridization and continuing evolution in Avon Gorge Sorbus

Ludwig, Shanna; Robertson, Tony; Rich, T. C. G.; Djordjević, Milena; Cerović, R.; Houston, L.; Harris, Stephen; Hiscock, Simon J.

doi:10.1093/aob/mct013

Cited by 54 publications

(101 citation statements)

References 66 publications

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“…Remnant sexuality was recently reported in some tetraploids of the S. aria complex in Great Britain (Ludwig et al 2013) and Bosnia-Herzegovina (Hajrudinović et al 2015). In an earlier study we report that the progeny of some northern Bavarian S. collina are genetically more variable than the adults, which indicates facultative sexual reproduction (Feulner et al 2013).…”

Section: Discussionsupporting

confidence: 49%

“…The reason for this loss could be autogamy (Ludwig et al 2013) or cross pollination causing meiotic loss of alleles, when compared to the parental plants.…”

Section: Discussionmentioning

confidence: 99%

“…The co-occurrence of different ploidy levels (diploids vs polyploids) associated with reproductive mode differentiation (sexual vs apomictic) was shown for the S. aria complex in Spain (Sosa et al 2014) and Great Britain , Ludwig et al 2013, where many new polyploid taxa were recently described . doi: 10.23855/preslia.2017.275 Northern Bavaria (Germany) is well known for its high incidence of endemism in the Sorbus latifolia (Lam.)…”

Section: Introductionmentioning

confidence: 93%

“…These tetraploids most probably belong to their ancestral lineages, as the opposite, that they functioned as a bridge for the evolution of these tetraploids, is unlikely. Crosses between di-and tetraploids are the typical origin for triploids (Ludwig et al 2013, Hajrudinović et al 2015. The triploids of MOR are peculiar; it is the only population at present without Sorbus aria s. str.…”

Section: Triploids In the Sorbus Aria Complexmentioning

confidence: 99%

“…They occur in sympatry with tetra-or/and diploids. Due to self-incompatibility their generative propagation depends to a great extent on accompanying di-or tetraploid Sorbus taxa (Ludwig et al 2013). Valuable descriptions of novel taxa are hampered by the small population sizes and distribution ranges and depend on the possibility of clearly delimitating them from triploids already described from other areas.…”

Section: Triploids In the Sorbus Aria Complexmentioning

confidence: 99%

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Genetic variability and morphology of tri- and tetraploid members of the Sorbus aria complex in northern Bavaria

Feulner¹,

Weig²,

Paule³

et al. 2017

Preslia

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. (2017): Genetic variability and morphology of tri-and tetraploid members of the Sorbus aria complex in northern Bavaria. -Preslia 89: 275-290.The Sorbus aria complex in the Franconian Jura, northern Bavaria, consists of the sexual diploid S. aria s. str. and putative apomictic polyploids, among them S. collina and S. danubialis. Here, the genetic and cytotypic structure of the S. aria complex and the proportion of clonal versus variable genotypes with a special focus on S. collina are studied using nuclear microsatellite markers, flow cytometry and multivariate morphometrics. In the Franconian Jura the tetraploid S. collina is the most frequent taxon in the S. aria complex. It consists of six closely related clones and a high number of unique genotypes, which were found in 70% of the populations studied. Morphologically, most of the clones and the unique tetraploid genotypes are not significantly differentiated. Therefore, all of them could be assigned to S. collina. Mechanisms that could result in the high number of genotypes within S. collina are accumulations of mutations, remnant sexuality, multiple polyploidization events and backcrossing. The results show that S. collina is a genetically quite variable facultative apomictic taxon. Triploids were identified sporadically and the microsatellites pointed to an origin from repeated hybridization events between diploid S. aria s. str. and S. collina. K e y w o r d s:

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Section: Discussionsupporting

confidence: 49%

“…The reason for this loss could be autogamy (Ludwig et al 2013) or cross pollination causing meiotic loss of alleles, when compared to the parental plants.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Section: Triploids In the Sorbus Aria Complexmentioning

confidence: 99%

Section: Triploids In the Sorbus Aria Complexmentioning

confidence: 99%

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Genetic variability and morphology of tri- and tetraploid members of the Sorbus aria complex in northern Bavaria

Feulner¹,

Weig²,

Paule³

et al. 2017

Preslia

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Autopolyploidy alters nodule‐level interactions in the legume–rhizobium mutualism

Forrester

Ashman

2019

American J of Botany

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Premise Polyploidy is a major genetic driver of ecological and evolutionary processes in plants, yet its effects on plant interactions with mutualistic microbes remain unresolved. The legume–rhizobium symbiosis regulates global nutrient cycles and plays a role in the diversification of legume species. In this mutualism, rhizobia bacteria fix nitrogen in exchange for carbon provided by legume hosts. This exchange occurs inside root nodules, which house bacterial cells and represent the interface of legume–rhizobium interactions. Although polyploidy may directly impact the legume–rhizobium mutualism, no studies have explored how it alters the internal structure of nodules. Methods We created synthetic autotetraploids using Medicago sativa subsp. caerulea. Neotetraploid plants and their diploid progenitors were singly inoculated with two strains of rhizobia, Sinorhizobium meliloti and S. medicae. Confocal microscopy was used to quantify internal traits of nodules produced by diploid and neotetraploid plants. Results Autotetraploid plants produced larger nodules with larger nitrogen fixation zones than diploids for both strains of rhizobia, although the significance of these differences was limited by power. Neotetraploid M. sativa subsp. caerulea plants also produced symbiosomes that were significantly larger, nearly twice the size, than those present in diploids. Conclusions This study sheds light on how polyploidy directly affects a plant–bacterium mutualism and uncovers novel mechanisms. Changes in plant–microbe interactions that directly result from polyploidy likely contribute to the increased ability of polyploid legumes to establish in diverse environments.

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