Transitions from distyly to homostyly are associated with floral evolution in the buckwheat genus (<i>Fagopyrum</i>)

Wu, Ling‐Yun; Wang, Bo; Schoen, Daniel J.; Huang, Shuang‐Quan

doi:10.3732/ajb.1700189

Cited by 19 publications

(14 citation statements)

References 73 publications

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“…The distylous genetic polymorphism is susceptible to evolutionary breakdown, most often resulting in transitions to homostyly and selfing. Homostyles have originated on numerous occasions among virtually all distylous families (Barrett & Shore, ; Schoen et al ., ; Mast et al ., ; Wu et al ., ). Several intrinsic features of distyly may account for this recurrent pattern involving loss of floral polymorphism.…”

Section: Discussionmentioning

confidence: 97%

Phylogenomic analysis reveals multiple evolutionary origins of selfing from outcrossing in a lineage of heterostylous plants

et al. 2019

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Evolutionary transitions from outcrossing to selfing often occur in heterostylous plants. Selfing homostyles originate within distylous populations and frequently evolve to become reproductively isolated species. We investigated this process in 10 species of Primula section Obconicolisteri using phylogenomic approaches and inferred how often homostyly originated from distyly and its consequences for population genetic diversity and floral trait evolution.We estimated phylogenetic relationships and reconstructed character evolution using the whole plastome comprised of 76 protein-coding genes. To investigate mating patterns and genetic diversity we screened 15 microsatellite loci in 40 populations. We compared floral traits among distylous and homostylous populations to determine how phenotypically differentiated homostyles were from their distylous ancestors.Section Obconicolisteri was monophyletic and we estimated multiple independent transitions from distyly to homostyly. High selfing rates characterised homostylous populations and this was associated with reduced genetic diversity. Flower size and pollen production were reduced in homostylous populations, but pollen size was significantly larger in some homostyles than in distylous morphs.Repeated transitions to selfing in section Obconicolisteri are likely to have been fostered by the complex montane environments that species occupy. Unsatisfactory pollinator service is likely to have promoted reproductive assurance in homostyles leading to subsequent population divergence through isolation.

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Section: Discussionmentioning

confidence: 97%

Phylogenomic analysis reveals multiple evolutionary origins of selfing from outcrossing in a lineage of heterostylous plants

et al. 2019

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“…Therefore, it will be very meaningful to the wild buckwheat investigation and the molecular breeding, through fully collecting wild buckwheat resources and using specificity molecular markers like psbE-psbL and ndhA intron, which have been reported after comprehensive comparative analysis based on the chloroplast genome of buckwheat [16] and have not been used in buckwheat phylogenetic research yet. Additionally, the previous research was only based on morphological characteristics and single molecular markers such as RAPD , AFLP , matK and so on, which did not provide enough evidence for the phylogenetic relationship verification [10,11,15,17,21]. It is also necessary to verify the potential of the utilization of psbE-psbL and ndhA intron in the research of the phylogenetic relationships of buckwheat.…”

Section: Introductionmentioning

confidence: 99%

psbE-psbL and ndhA Intron, the Promising Plastid DNA Barcode of Fagopyrum

Huang

Wang

et al. 2019

IJMS

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Buckwheat is an important functional food material with high nutritional value. However, it is still a difficult task for the taxonomy studies of wild buckwheat that are only based on morphology. In order to demonstrate the most efficient DNA barcode in the phylogenetic research of buckwheat, promote the investigation of wild buckwheat, and also reveal the phylogenetic relationship between Fagopyrum species, psbE-psbL and ndhA intron were validated here, which previously have been proved to be promising DNA barcode candidates for phylogenetic studies in genera Fagopyrum. Meanwhile, ndhA intron + psbE-psbL and matK + psbE-psbL could distinguish the relationship between species clearly. Combining the results of morphology and molecular markers, we suggested the buckwheat species should be divided into two subgroups, one subgroup consisted of F. tataricum, F. esculentum, F. cymosum and its related wild species, and the other subgroup included other wild buckwheat species. Our results could fulfill molecular markers of taxonomy research in genera Fagopyrum, promote wild buckwheat species identification, and assist in the use of wild buckwheat resources in the future. Additionally, the phylogenetic relationship revealed here could provide valuable information for molecular breeding of buckwheat and provide reference for inter-species hybridization.

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“…Brys et al ., ; Zhou et al ., ). Homostyles are found in most heterostylous families (Table ; see Sakai & Wright, ; Chen et al ., ; Wu et al ., ) and in some taxa the transitions are associated with polyploidization (e.g. Primula ), although this is not a general pattern among heterostylous groups (Naiki, ).…”

Section: Evolutionary Breakdownmentioning

confidence: 99%

‘A most complex marriage arrangement’: recent advances on heterostyly and unresolved questions

2019

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Summary Heterostylous genetic polymorphisms provide paradigmatic systems for investigating adaptation and natural selection. Populations are usually comprised of two (distyly) or three (tristyly) mating types, maintained by negative frequency‐dependent selection resulting from disassortative mating. Theory predicts this mating system should result in equal style‐morph ratios (isoplethy) at equilibrium. Here, I review recent advances on heterostyly, focusing on examples challenging stereotypical depictions of the polymorphism and unresolved questions. Comparative analyses indicate multiple origins of heterostyly, often within lineages. Ecological studies demonstrate that structural components of heterostyly are adaptations improving the proficiency of animal‐mediated cross‐pollination and reducing pollen wastage. Both neutral and selective processes cause deviations from isoplethy in heterostylous populations, and, under some ecological and demographic conditions, cause breakdown of the polymorphism, resulting in either the evolution of autogamy and mixed mating, or transitions to alternative outcrossing systems, including dioecy. Earlier ideas on the genetic architecture of the S‐locus supergene governing distyly have recently been overturned by discovery that the dominant S‐haplotype is a hemizygous region absent from the s‐haplotype. Ecological, phylogenetic and molecular genetic data have validated some features of theoretical models on the selection of the polymorphism. Although heterostyly is the best‐understood floral polymorphism in angiosperms, many unanswered questions remain.

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Transitions from distyly to homostyly are associated with floral evolution in the buckwheat genus (Fagopyrum)

Cited by 19 publications

References 73 publications

Phylogenomic analysis reveals multiple evolutionary origins of selfing from outcrossing in a lineage of heterostylous plants

Phylogenomic analysis reveals multiple evolutionary origins of selfing from outcrossing in a lineage of heterostylous plants

psbE-psbL and ndhA Intron, the Promising Plastid DNA Barcode of Fagopyrum

‘A most complex marriage arrangement’: recent advances on heterostyly and unresolved questions

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