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Sidhu CS, Lozano GE, Miner MC, Howe E, Wilson-Rankin EE. Pollination Ecology of Island Endemic Plants: A Case Study on the California Channel Islands. WEST N AM NATURALIST 2022. [DOI: 10.3398/064.082.0401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- C. Sheena Sidhu
- Department of Entomology, University of California Riverside, Riverside, CA 92521
| | - Giselle E. Lozano
- Department of Entomology, University of California Riverside, Riverside, CA 92521
| | - Michelle C. Miner
- Department of Entomology, University of California Riverside, Riverside, CA 92521
| | - Emily Howe
- Soil Ecology and Restoration Group, San Diego State University Research Foundation, San Diego, CA 92182
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Silva DM, Luna ALL, Souza CS, Nunes YRF, Fonseca RS, Azevedo IFPD. Sexual and reproductive systems of woody species in
vereda
are distributed according to the life form and habitat occurrence. AUSTRAL ECOL 2022. [DOI: 10.1111/aec.13235] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Danila Moreira Silva
- Programa de Pós‐Graduação em Botânica Aplicada Universidade Estadual de Montes Claros Avenida Dr. Ruy Braga, S/N – Bairro Vila Mauricéia Montes Claros 39401‐089 Brazil
| | - Andressa Laís Lacerda Luna
- Programa de Pós‐Graduação em Botânica Aplicada Universidade Estadual de Montes Claros Avenida Dr. Ruy Braga, S/N – Bairro Vila Mauricéia Montes Claros 39401‐089 Brazil
| | - Camila Silveira Souza
- Programa de Pós‐Graduação em Botânica Aplicada Universidade Estadual de Montes Claros Avenida Dr. Ruy Braga, S/N – Bairro Vila Mauricéia Montes Claros 39401‐089 Brazil
- Laboratório de Ecologia Vegetal, Departamento de Biologia Geral Universidade Estadual de Montes Claros Montes Claros Brazil
| | - Yule Roberta Ferreira Nunes
- Programa de Pós‐Graduação em Botânica Aplicada Universidade Estadual de Montes Claros Avenida Dr. Ruy Braga, S/N – Bairro Vila Mauricéia Montes Claros 39401‐089 Brazil
- Laboratório de Ecologia Vegetal, Departamento de Biologia Geral Universidade Estadual de Montes Claros Montes Claros Brazil
| | - Rúbia Santos Fonseca
- Instituto de Ciências Agrárias Universidade Federal de Minas Gerais, Bairro Universitário Montes Claros Brazil
| | - Islaine Franciely Pinheiro de Azevedo
- Programa de Pós‐Graduação em Botânica Aplicada Universidade Estadual de Montes Claros Avenida Dr. Ruy Braga, S/N – Bairro Vila Mauricéia Montes Claros 39401‐089 Brazil
- Laboratório de Ecologia Vegetal, Departamento de Biologia Geral Universidade Estadual de Montes Claros Montes Claros Brazil
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Ryniewicz J, Roguz K, Mirski P, Brzosko E, Skłodowski M, Wróblewska A, Ostrowiecka B, Tałałaj I, Jermakowicz E, Zych M. Spatiotemporal Variations in Seed Set and Pollen Limitation in Populations of the Rare Generalist Species Polemonium caeruleum in Poland. FRONTIERS IN PLANT SCIENCE 2022; 12:755830. [PMID: 35046972 PMCID: PMC8761629 DOI: 10.3389/fpls.2021.755830] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 11/22/2021] [Indexed: 06/01/2023]
Abstract
A vast majority of angiosperms are pollinated by animals, and a decline in the number and diversity of insects often affects plant reproduction through pollen limitation. This phenomenon may be particularly severe in rare plant species, whose populations are shrinking. Here, we examined the variability in factors shaping reproductive success and pollen limitation in red-listed Polemonium caeruleum L. During a 5-year study in several populations of P. caeruleum (7-15, depending on year), we assessed the degree of pollen limitation based on differences in seed set between open-pollinated (control) and hand-pollinated flowers. We analysed the effects of flower visitors, population size, and meteorological data on plant reproductive success and pollen limitation. Our study showed that pollen limitation rarely affected P. caeruleum populations, and was present mainly in small populations. Pollen limitation index was negatively affected by the size of population, visitation frequency of all insects, and when considering the visitation frequency of individual groups, also by honeybee visits. Seed production in control treatment was positively influenced by the population size, average monthly precipitation in June and visits of hoverflies, while visits of honeybees, average monthly temperature in September, and average monthly precipitation in August influenced seed production negatively. As generalist plant P. caeruleum can be pollinated by diverse insect groups, however, in small populations their main visitors, the honeybees and bumblebees, may be less attracted, eventually leading to the disappearance of these populations. In pollination of P. caeruleum managed honeybees may play a dual role: while they are the most frequent and efficient flower visitors, their presence decreases seed set in open-pollinated flowers, which is most probably related to efficient pollen collection by these insects.
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Affiliation(s)
- Justyna Ryniewicz
- Botanic Garden, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Katarzyna Roguz
- Botanic Garden, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Paweł Mirski
- Faculty of Biology, University of Białystok, Białystok, Poland
| | - Emilia Brzosko
- Faculty of Biology, University of Białystok, Białystok, Poland
| | - Mateusz Skłodowski
- Botanic Garden, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Ada Wróblewska
- Faculty of Biology, University of Białystok, Białystok, Poland
| | | | - Izabela Tałałaj
- Faculty of Biology, University of Białystok, Białystok, Poland
| | | | - Marcin Zych
- Botanic Garden, Faculty of Biology, University of Warsaw, Warsaw, Poland
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De Cauwer I, Vernet P, Billiard S, Godé C, Bourceaux A, Ponitzki C, Saumitou-Laprade P. Widespread coexistence of self-compatible and self-incompatible phenotypes in a diallelic self-incompatibility system in Ligustrum vulgare (Oleaceae). Heredity (Edinb) 2021; 127:384-392. [PMID: 34482370 PMCID: PMC8479060 DOI: 10.1038/s41437-021-00463-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 07/26/2021] [Accepted: 07/26/2021] [Indexed: 02/07/2023] Open
Abstract
The breakdown of self-incompatibility (SI) in angiosperms is one of the most commonly observed evolutionary transitions. While multiple examples of SI breakdown have been documented in natural populations, there is strikingly little evidence of stable within-population polymorphism with both inbreeding (self-compatible) and outcrossing (self-incompatible) individuals. This absence of breeding system polymorphism corroborates theoretical expectations that predict that in/outbreeding polymorphism is possible only under very restricted conditions. However, theory also predicts that a diallelic sporophytic SI system should facilitate the maintenance of such polymorphism. We tested this prediction by studying the breeding system of Ligustrum vulgare L., an insect-pollinated hermaphroditic species of the Oleaceae family. Using stigma tests with controlled pollination and paternity assignment of open-pollinated progenies, we confirmed the existence of two self-incompatibility groups in this species. We also demonstrated the occurrence of self-compatible individuals in different populations of Western Europe arising from a mutation affecting the functioning of the pollen component of SI. Our results show that the observed low frequency of self-compatible individuals in natural populations is compatible with theoretical predictions only if inbreeding depression is very high.
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Affiliation(s)
- Isabelle De Cauwer
- grid.503422.20000 0001 2242 6780Univ. Lille, UMR 8198 – Evo-Eco-Paleo, F-59000 Lille, France ,grid.4444.00000 0001 2112 9282CNRS, UMR 8198, F-59000 Lille, France
| | - Philippe Vernet
- grid.503422.20000 0001 2242 6780Univ. Lille, UMR 8198 – Evo-Eco-Paleo, F-59000 Lille, France ,grid.4444.00000 0001 2112 9282CNRS, UMR 8198, F-59000 Lille, France
| | - Sylvain Billiard
- grid.503422.20000 0001 2242 6780Univ. Lille, UMR 8198 – Evo-Eco-Paleo, F-59000 Lille, France ,grid.4444.00000 0001 2112 9282CNRS, UMR 8198, F-59000 Lille, France
| | - Cécile Godé
- grid.503422.20000 0001 2242 6780Univ. Lille, UMR 8198 – Evo-Eco-Paleo, F-59000 Lille, France ,grid.4444.00000 0001 2112 9282CNRS, UMR 8198, F-59000 Lille, France
| | - Angélique Bourceaux
- grid.503422.20000 0001 2242 6780Univ. Lille, UMR 8198 – Evo-Eco-Paleo, F-59000 Lille, France ,grid.4444.00000 0001 2112 9282CNRS, UMR 8198, F-59000 Lille, France
| | - Chloé Ponitzki
- grid.503422.20000 0001 2242 6780Univ. Lille, UMR 8198 – Evo-Eco-Paleo, F-59000 Lille, France ,grid.4444.00000 0001 2112 9282CNRS, UMR 8198, F-59000 Lille, France
| | - Pierre Saumitou-Laprade
- grid.503422.20000 0001 2242 6780Univ. Lille, UMR 8198 – Evo-Eco-Paleo, F-59000 Lille, France ,grid.4444.00000 0001 2112 9282CNRS, UMR 8198, F-59000 Lille, France
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Van Rossum F, Raspé O, Vandelook F. Evidence of spontaneous selfing and disomic inheritance in Geranium robertianum. Ecol Evol 2021; 11:8640-8653. [PMID: 34257920 PMCID: PMC8258199 DOI: 10.1002/ece3.7677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 04/24/2021] [Accepted: 04/27/2021] [Indexed: 11/18/2022] Open
Abstract
Knowing species' breeding system and mating processes occurring in populations is important not only for understanding population dynamics, gene flow processes, and species' response to climate change, but also for designing control plans of invasive species. Geranium robertianum, a widespread biennial herbaceous species showing high morphological variation and wide ecological amplitude, can become invasive outside its distribution range. A mixed-mating system may be expected given the species' floral traits. However, autonomous selfing is considered as a common feature. Genetic variation and structure, and so population mating processes, have not been investigated in wild populations. We developed 15 polymorphic microsatellite markers to quantify genetic variation and structure in G. robertianum. To investigate whether selfing might be the main mating process in natural conditions, we sampled three generations of plants (adult, F1, and F2) for populations from the UK, Spain, Belgium, Germany, and Sweden, and compared open-pollinated with outcrossed hand-pollinated F2 progeny. The highly positive Wright's inbreeding coefficient (F IS) values in adults, F1, and open-pollinated F2 progeny and the low F IS values in outcross F2 progeny supported autonomous selfing as the main mating process for G. robertianum in wild conditions, despite the presence of attractive signals for insect pollination. Genetic differentiation among samples was found, showing some western-eastern longitudinal trend. Long-distance seed dispersal might have contributed to the low geographic structure. Local genetic differentiation may have resulted not only from genetic drift effects favored by spontaneous selfing, but also from ecological adaptation. The presence of duplicate loci with disomic inheritance is consistent with the hypothesis of allotetraploid origin of G. robertianum. The fact that most microsatellite markers behave as diploid loci with no evidence of duplication supports the hypothesis of ancient polyploidization. The differences in locus duplication and the relatively high genetic diversity across G. robertianum range despite spontaneous autonomous selfing suggest multiple events of polyploidization.
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Affiliation(s)
- Fabienne Van Rossum
- Meise Botanic GardenMeiseBelgium
- Service général de l'Enseignement supérieur et de la Recherche scientifiqueFédération Wallonie‐BruxellesBrusselsBelgium
| | - Olivier Raspé
- Meise Botanic GardenMeiseBelgium
- Service général de l'Enseignement supérieur et de la Recherche scientifiqueFédération Wallonie‐BruxellesBrusselsBelgium
- Present address:
School of ScienceMae Fah Luang UniversityChiang RaiThailand
| | - Filip Vandelook
- Meise Botanic GardenMeiseBelgium
- Biology DepartmentPhilipps Universität MarburgMarburgGermany
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Sexual reproductive strategies of Puya nitida (Bromeliaceae) in a Colombian paramo, a tropical high-elevation ecosystem. JOURNAL OF TROPICAL ECOLOGY 2021. [DOI: 10.1017/s0266467420000218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
AbstractThe low availability of pollinators in high-elevation ecosystems can lead to flowering plants showing different adaptive responses in order to assure their reproductive success. Shifts toward autogamy and asexual reproductive rates (the reproductive assurance hypothesis) and the compensatory measures to maintain outcrossing such as flower longevity and more prolonged pistil receptivity (the increased pollination probability hypothesis) are some of these responses. Several studies have tested both hypotheses, but investigations of plants of tropical alpine environments such as paramos that support these assumptions are still scarce. Puya nitida, an endemic Colombian plant species distributed in the paramo and subparamo in the Eastern Cordillera of Cundinamarca department, was used as a case study to test its reproductive characteristics that assure its sexual reproduction. We analysed the species’ floral morphology and development, its phenological patterns and its plant mating-system. We found that Puya nitida showed floral characteristics that promote pollination by birds, herkogamy and dichogamy, flowers and receptive stigmas with 9 and 12 days of longevity, respectively and an index of self-incompatibility that shows that it is mostly self-incompatible. We found a synchronic phenological pattern with an annual frequency and an intermediate duration with a peak in the period of lowest rainfall. Our results suggested that longer floral development, prolonged stigma receptivity, herkogamy and dichogamy and self-incompatibility might assure reproductive success, since the cross-pollination might be favoured when few pollinators are in attendance. Overall, these reproductive mechanisms add evidence to the increased pollination probability hypothesis, specifically for a plant species of a tropical high-elevation ecosystem where pollinators are scarce.
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Kerbs B, Crawford DJ, White G, Moura M, Borges Silva L, Schaefer H, Brown K, Mort ME, Kelly JK. How rapidly do self-compatible populations evolve selfing? Mating system estimation within recently evolved self-compatible populations of Azorean Tolpis succulenta (Asteraceae). Ecol Evol 2020; 10:13990-13999. [PMID: 33391697 PMCID: PMC7771160 DOI: 10.1002/ece3.6992] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 10/08/2020] [Accepted: 10/14/2020] [Indexed: 01/04/2023] Open
Abstract
Genome-wide genotyping and Bayesian inference method (BORICE) were employed to estimate outcrossing rates and paternity in two small plant populations of Tolpis succulenta (Asteraceae) on Graciosa island in the Azores. These two known extant populations of T. succulenta on Graciosa have recently evolved self-compatibility. Despite the expectation that selfing would occur at an appreciable rate (self-incompatible populations of the same species show low but nonzero selfing), high outcrossing was found in progeny arrays from maternal plants in both populations. This is inconsistent with an immediate transition to high selfing following the breakdown of a genetic incompatibility system. This finding is surprising given the small population sizes and the recent colonization of an island from self-incompatible colonists of T. succulenta from another island in the Azores, and a potential paucity of pollinators, all factors selecting for selfing through reproductive assurance. The self-compatible lineage(s) likely have high inbreeding depression (ID) that effectively halts the evolution of increased selfing, but this remains to be determined. Like their progeny, all maternal plants in both populations are fully outbred, which is consistent with but not proof of high ID. High multiple paternity was found in both populations, which may be due in part to the abundant pollinators observed during the flowering season.
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Affiliation(s)
- Benjamin Kerbs
- Department of Ecology & Evolutionary BiologyUniversity of KansasLawrenceKSUSA
| | - Daniel J. Crawford
- Department of Ecology & Evolutionary BiologyUniversity of KansasLawrenceKSUSA
- Biodiversity InstituteUniversity of KansasLawrenceKSUSA
| | - Griffin White
- Department of Ecology & Evolutionary BiologyUniversity of KansasLawrenceKSUSA
- ETH ZurichFunctional Genomics Center ZurichZurichSwitzerland
| | - Mónica Moura
- InBIO Laboratório Associado, Pólo dos AçoresFaculdade de Ciências TecnoclogiaCIBIO, Centro de Investigação em Biodiversidade e Recursos GenéticosUniversidade dos AçoresPonta DelgadaPortugal
| | - Lurdes Borges Silva
- InBIO Laboratório Associado, Pólo dos AçoresFaculdade de Ciências TecnoclogiaCIBIO, Centro de Investigação em Biodiversidade e Recursos GenéticosUniversidade dos AçoresPonta DelgadaPortugal
| | - Hanno Schaefer
- Department of Ecology and Ecosystem ManagementPlant Biodiversity ResearchTechnical University of MunichFreisingGermany
| | - Keely Brown
- Department of Ecology & Evolutionary BiologyUniversity of KansasLawrenceKSUSA
| | - Mark E. Mort
- Department of Ecology & Evolutionary BiologyUniversity of KansasLawrenceKSUSA
| | - John K. Kelly
- Department of Ecology & Evolutionary BiologyUniversity of KansasLawrenceKSUSA
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Jiménez-López FJ, Ortiz PL, Talavera M, Arista M. Reproductive Assurance Maintains Red-Flowered Plants of Lysimachia arvensis in Mediterranean Populations Despite Inbreeding Depression. FRONTIERS IN PLANT SCIENCE 2020; 11:563110. [PMID: 33324430 PMCID: PMC7725749 DOI: 10.3389/fpls.2020.563110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Accepted: 10/28/2020] [Indexed: 06/12/2023]
Abstract
Flower color polymorphism, an infrequent but phylogenetically widespread condition in plants, is captivating because it can only be maintained under a few selective regimes but also because it can drive intra-morph assortative mating and promote speciation. Lysimachia arvensis is a polymorphic species with red or blue flowered morphs. In polymorphic populations, which are mostly Mediterranean, pollinators prefer blue-flowered plants to the red ones, and abiotic factors also favors blue-flowered plants. We hypothesize that the red morph is maintained in Mediterranean areas due to its selfing capacity. We assessed inbreeding depression in both color morphs in two Mediterranean populations and genetic diversity was studied via SSR microsatellites in 20 natural populations. Results showed that only 44-47% of selfed progeny of the red plants reached reproduction while about 72-91% of blue morph progeny did it. Between-morph genetic differentiation was high and the red morph had a lower genetic diversity and a higher inbreeding coefficient, mainly in the Mediterranean. Results suggest that selfing maintaining the red morph in Mediterranean areas despite its inbreeding depression. In addition, genetic differentiation between morphs suggests a low gene flow between them, suggesting reproductive isolation.
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Affiliation(s)
- Francisco J. Jiménez-López
- Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, Seville, Spain
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Gibson MJS, Crawford DJ, Holder MT, Mort ME, Kerbs B, de Sequeira MM, Kelly JK. Genome-wide genotyping estimates mating system parameters and paternity in the island species Tolpis succulenta. AMERICAN JOURNAL OF BOTANY 2020; 107:1189-1197. [PMID: 32864742 DOI: 10.1002/ajb2.1515] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Accepted: 02/22/2020] [Indexed: 06/11/2023]
Abstract
PREMISE The mating system has profound consequences, not only for ecology and evolution, but also for the conservation of threatened or endangered species. Unfortunately, small populations are difficult to study owing to limits on sample size and genetic marker diversity. Here, we estimated mating system parameters in three small populations of an island plant using genomic genotyping. Although self-incompatible (SI) species are known to often set some self-seed, little is known about how "leaky SI" affects selfing rates in nature or the role that multiple paternity plays in small populations. METHODS We generalized the BORICE mating system program to determine the siring pattern within maternal families. We applied this algorithm to maternal families from three populations of Tolpis succulenta from Madeira Island and genotyped the progeny using RADseq. We applied BORICE to estimate each individual offspring as outcrossed or selfed, the paternity of each outcrossed offspring, and the level of inbreeding of each maternal plant. RESULTS Despite a functional self-incompatibility system, these data establish T. succulenta as a pseudo-self-compatible (PSC) species. Two of 75 offspring were strongly indicated as products of self-fertilization. Despite selfing, all adult maternal plants were fully outbred. There was high differentiation among and low variation within populations, consistent with a history of genetic isolation of these small populations. There were generally multiple sires per maternal family. Twenty-two percent of sib contrasts (between outcrossed offspring within maternal families) shared the same sire. CONCLUSIONS Genome-wide genotyping, combined with appropriate analytical methods, enables estimation of mating system and multiple paternity in small populations. These data address questions about the evolution of reproductive traits and the conservation of threatened populations.
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Affiliation(s)
- Matthew J S Gibson
- Department of Ecology & Evolutionary Biology, University of Kansas, Lawrence, KS, 66045-7534, USA
| | - Daniel J Crawford
- Department of Ecology & Evolutionary Biology, University of Kansas, Lawrence, KS, 66045-7534, USA
- Biodiversity Institute, University of Kansas, Lawrence, KS, 66045-7534, USA
| | - Mark T Holder
- Department of Ecology & Evolutionary Biology, University of Kansas, Lawrence, KS, 66045-7534, USA
- Biodiversity Institute, University of Kansas, Lawrence, KS, 66045-7534, USA
| | - Mark E Mort
- Department of Ecology & Evolutionary Biology, University of Kansas, Lawrence, KS, 66045-7534, USA
| | - Benjamin Kerbs
- Department of Ecology & Evolutionary Biology, University of Kansas, Lawrence, KS, 66045-7534, USA
| | - Miguel Menezes de Sequeira
- Madeira Botanical Group, Faculty of Life Sciences, University of Madeira, Campus Universitário da Penteada, 9020-105, Funchal, Portugal
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Pólo dos Açores, 9501-81, Ponta Delgada, Portugal
| | - John K Kelly
- Department of Ecology & Evolutionary Biology, University of Kansas, Lawrence, KS, 66045-7534, USA
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Jantzen F, Wozniak N, Kappel C, Sicard A, Lenhard M. A high-throughput amplicon-based method for estimating outcrossing rates. PLANT METHODS 2019; 15:47. [PMID: 31131016 PMCID: PMC6525360 DOI: 10.1186/s13007-019-0433-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 05/08/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND The outcrossing rate is a key determinant of the population-genetic structure of species and their long-term evolutionary trajectories. However, determining the outcrossing rate using current methods based on PCR-genotyping individual offspring of focal plants for multiple polymorphic markers is laborious and time-consuming. RESULTS We have developed an amplicon-based, high-throughput enabled method for estimating the outcrossing rate and have applied this to an example of scented versus non-scented Capsella (Shepherd's Purse) genotypes. Our results show that the method is able to robustly capture differences in outcrossing rates. They also highlight potential biases in the estimates resulting from differential haplotype sharing of the focal plants with the pollen-donor population at individual amplicons. CONCLUSIONS This novel method for estimating outcrossing rates will allow determining this key population-genetic parameter with high-throughput across many genotypes in a population, enabling studies into the genetic determinants of successful pollinator attraction and outcrossing.
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Affiliation(s)
- Friederike Jantzen
- Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Str. 24-25, House 26, 14476 Potsdam-Golm, Germany
| | - Natalia Wozniak
- Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Str. 24-25, House 26, 14476 Potsdam-Golm, Germany
- Present Address: Molecular Genetics and Physiology of Plants, Faculty of Biology and Biotechnology, Ruhr University Bochum, Universitätsstraße 150, Building ND North, 44801 Bochum, Germany
| | - Christian Kappel
- Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Str. 24-25, House 26, 14476 Potsdam-Golm, Germany
| | - Adrien Sicard
- Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Str. 24-25, House 26, 14476 Potsdam-Golm, Germany
- Present Address: Department of Plant Biology, Swedish University of Agricultural, Sciences and Linnean Center for Plant Biology, Uppsala, Sweden
| | - Michael Lenhard
- Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Str. 24-25, House 26, 14476 Potsdam-Golm, Germany
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Berjano R, Rodríguez-Castañeda NL, Ortiz PL, Ortiz MA, Arista M. The link between selfing and greater dispersibility in a heterocarpic Asteraceae. AMERICAN JOURNAL OF BOTANY 2018; 105:2065-2074. [PMID: 30536384 DOI: 10.1002/ajb2.1207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 09/25/2018] [Indexed: 06/09/2023]
Abstract
PREMISE OF THE STUDY Although an evolutionary link between breeding system and dispersibility has been proposed, to date empirical data and theoretical models of plants show contrasting trends. METHODS We tested two competing hypotheses for the association between breeding systems and dispersibility in the heterocarpic Hypochaeris salzmanniana (Asteraceae) by using both an experimental approach and surveys over 2 years of five natural populations along an environmental cline with a gradient of pollinator availability. KEY RESULTS Hypochaeris salzmanniana produced two types of fruits, beaked (BF) and nonbeaked (NBF), which differ in their dispersal ability. The BF were lighter and had a lower dropping velocity and higher dispersal distance than the NBF. Potential for long-distance dispersal, measured as BF ratio per head, had high narrow-sense heritability. Greater dispersibility and selfing ability were linked at all the scales studied. Both selfed BF and NBF fruits had longer plumes and lower plume loading than outcrossed fruits, characteristics that promote farther dispersal. Natural populations with a higher percentage of self-compatible plants showed a higher BF ratio. Moreover, selfing led to a higher BF ratio than outcrossing. CONCLUSIONS The avoidance of inbreeding depression seems to be the most plausible selective pressure for the greater dispersibility traits of selfed seeds. Furthermore, the ability to modulate the BF ratio and thus the potential for long-distance dispersal of offspring based on its selfed or outcrossed origin could be advantageous, and therefore selected, under unpredictable pollination environments that favor higher dispersive selfers, which overcome both pollen limitation and inbreeding avoidance.
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Affiliation(s)
- Regina Berjano
- Departamento de Botánica, Ecología y Fisiología Vegetal, Universidad de Córdoba, 14071, Córdoba, Spain
- Departamento de Biología Vegetal y Ecología, Universidad de Sevilla, Apdo. 1095, 41080, Sevilla, Spain
| | | | - Pedro L Ortiz
- Departamento de Biología Vegetal y Ecología, Universidad de Sevilla, Apdo. 1095, 41080, Sevilla, Spain
| | - María A Ortiz
- Departamento de Biología Vegetal y Ecología, Universidad de Sevilla, Apdo. 1095, 41080, Sevilla, Spain
| | - Montserrat Arista
- Departamento de Biología Vegetal y Ecología, Universidad de Sevilla, Apdo. 1095, 41080, Sevilla, Spain
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