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Chung KP, Gonzalez-Duran E, Ruf S, Endries P, Bock R. Control of plastid inheritance by environmental and genetic factors. NATURE PLANTS 2023; 9:68-80. [PMID: 36646831 PMCID: PMC9873568 DOI: 10.1038/s41477-022-01323-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Accepted: 11/26/2022] [Indexed: 06/01/2023]
Abstract
The genomes of cytoplasmic organelles (mitochondria and plastids) are maternally inherited in most eukaryotes, thus excluding organellar genomes from the benefits of sexual reproduction and recombination. The mechanisms underlying maternal inheritance are largely unknown. Here we demonstrate that two independently acting mechanisms ensure maternal inheritance of the plastid (chloroplast) genome. Conducting large-scale genetic screens for paternal plastid transmission, we discovered that mild chilling stress during male gametogenesis leads to increased entry of paternal plastids into sperm cells and strongly increased paternal plastid transmission. We further show that the inheritance of paternal plastid genomes is controlled by the activity of a genome-degrading exonuclease during pollen maturation. Our data reveal that (1) maternal inheritance breaks down under specific environmental conditions, (2) an organelle exclusion mechanism and a genome degradation mechanism act in concert to prevent paternal transmission of plastid genes and (3) plastid inheritance is determined by complex gene-environment interactions.
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Affiliation(s)
- Kin Pan Chung
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Potsdam-Golm, Germany
| | | | - Stephanie Ruf
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Potsdam-Golm, Germany
| | - Pierre Endries
- Universität Hamburg, Institut für Pflanzenwissenschaften und Mikrobiologie, Hamburg, Germany
| | - Ralph Bock
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Potsdam-Golm, Germany.
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Plaschil S, Abel S, Klocke E. The variability of nuclear DNA content of different Pelargonium species estimated by flow cytometry. PLoS One 2022; 17:e0267496. [PMID: 35482804 PMCID: PMC9049363 DOI: 10.1371/journal.pone.0267496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 04/08/2022] [Indexed: 11/24/2022] Open
Abstract
Pelargonium is a versatile genus mainly from the Cape Region, South Africa. The genus is divided into four subgenera and 16 sections characterized by several groups of chromosomes sizes and numbers. The DNA content of species from all subgenera and sections of Pelargonium, except for the sections Subsucculentia and Campylia was estimated using flow cytometry. Nuclei of Pelargonium samples (leaf or petal tissue) and an internal plant standard (leaf tissue) were isolated together and stained with propidium iodide. The DNA content was estimated providing that the 2C peaks of sample and standard be in linearity in the flow cytometer histograms. In total, 96 Pelargonium accessions of 60 species (22 Pelargonium species for the first time) were analyzed. The 2C DNA content ranged from 0.84 pg (P. longifolium, section Hoarea) to 6.69 pg (P. schizopetalum, section Magnistipulacea) and the corresponding 1Cx DNA content from 0.42 pg (P. longifolium) to 1.72 pg (P. transvaalense. This demonstrates the high plasticity within the genus Pelargonium. Some species, such as P. peltatum accessions revealed a pronounced endopolyploidization in leaves but not in petals underlining the importance to choose the right tissue as sample for the flow cytometry analysis. The reported genome sizes are a step forward towards the characterization of the Pelargonium collection within the German Gene Bank for Ornamental Plants and a valuable base for future sequencing programs of the Pelargonium genomes.
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Affiliation(s)
- Sylvia Plaschil
- Julius Kühn Institute (JKI)—Federal Research Centre of Cultivated Plants, Institute for Breeding Research on Horticultural Crops, Quedlinburg, Germany
- * E-mail:
| | - Simone Abel
- Julius Kühn Institute (JKI)—Federal Research Centre of Cultivated Plants, Institute for Breeding Research on Horticultural Crops, Quedlinburg, Germany
| | - Evelyn Klocke
- Julius Kühn Institute (JKI)—Federal Research Centre of Cultivated Plants, Institute for Breeding Research on Horticultural Crops, Quedlinburg, Germany
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Breman FC, Snijder RC, Korver JW, Pelzer S, Sancho-Such M, Schranz ME, Bakker FT. Interspecific Hybrids Between Pelargonium × hortorum and Species From P. Section Ciconium Reveal Biparental Plastid Inheritance and Multi-Locus Cyto-Nuclear Incompatibility. FRONTIERS IN PLANT SCIENCE 2020; 11:614871. [PMID: 33391328 PMCID: PMC7775418 DOI: 10.3389/fpls.2020.614871] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Accepted: 11/23/2020] [Indexed: 06/01/2023]
Abstract
The genetics underlying Cyto-Nuclear Incompatibility (CNI) was studied in Pelargonium interspecific hybrids. We created hybrids of 12 closely related crop wild relatives (CWR) with the ornamental P. × hortorum. Ten of the resulting 12 (F1) interspecific hybrids segregate for chlorosis suggesting biparental plastid inheritance. The segregation ratios of the interspecific F2 populations show nuclear interactions of one, two, or three nuclear genes regulating plastid function dependent on the parents. We further validated that biparental inheritance of plastids is common in section Ciconium, using diagnostic PCR primers. Our results pave the way for using the diverse species from section Ciconium, each with its own set of characteristics, as novel sources of desired breeding traits for P. × hortorum cultivars.
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Affiliation(s)
- Floris C. Breman
- Biosystematics Group, Wageningen University and Research, Wageningen, Netherlands
| | | | - Joost W. Korver
- Biosystematics Group, Wageningen University and Research, Wageningen, Netherlands
| | - Sieme Pelzer
- Biosystematics Group, Wageningen University and Research, Wageningen, Netherlands
| | | | - M. Eric Schranz
- Biosystematics Group, Wageningen University and Research, Wageningen, Netherlands
| | - Freek T. Bakker
- Biosystematics Group, Wageningen University and Research, Wageningen, Netherlands
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Jabaily RS, Shepherd KA, Michener PS, Bush CJ, Rivero R, Gardner AG, Sessa EB. Employing hypothesis testing and data from multiple genomic compartments to resolve recalcitrant backbone nodes in Goodenia s.l. (Goodeniaceae). Mol Phylogenet Evol 2018; 127:502-512. [PMID: 29758275 DOI: 10.1016/j.ympev.2018.05.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 03/22/2018] [Accepted: 05/07/2018] [Indexed: 11/30/2022]
Abstract
Goodeniaceae is a primarily Australian flowering plant family with a complex taxonomy and evolutionary history. Previous phylogenetic analyses have successfully resolved the backbone topology of the largest clade in the family, Goodenia s.l., but have failed to clarify relationships within the species-rich and enigmatic Goodenia clade C, a prerequisite for taxonomic revision of the group. We used genome skimming to retrieve sequences for chloroplast, mitochondrial, and nuclear markers for 24 taxa representing Goodenia s.l., with a particular focus on Goodenia clade C. We performed extensive hypothesis tests to explore incongruence in clade C and evaluate statistical support for clades within this group, using datasets from all three genomic compartments. The mitochondrial dataset is comparable to the chloroplast dataset in providing resolution within Goodenia clade C, though backbone support values within this clade remain low. The hypothesis tests provided an additional, complementary means of evaluating support for clades. We propose that the major subclades of Goodenia clade C (C1-C3 + Verreauxia) are the result of a rapid radiation, and each represents a distinct lineage.
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Affiliation(s)
- Rachel S Jabaily
- Department of Organismal Biology & Ecology, Colorado College, Colorado Springs, CO 80903, USA; Department of Biology, Rhodes College, Memphis, TN 38112, USA.
| | - Kelly A Shepherd
- Western Australian Herbarium, Department of Biodiversity, Conservation and Attractions, Kensington, WA 6151, Australia.
| | | | - Caroline J Bush
- Department of Biology, Rhodes College, Memphis, TN 38112, USA.
| | - Rodrigo Rivero
- Department of Biology, University of Florida, Gainesville, FL 32607, USA; Department of Natural Resources and Environmental Management, University of Hawaii- Mānoa, Honolulu, HI 96822, USA.
| | - Andrew G Gardner
- Department of Biological Sciences, California State University, Stanislaus, One University Circle, Turlock, CA 95382, USA.
| | - Emily B Sessa
- Department of Biology, University of Florida, Gainesville, FL 32607, USA; Genetics Institute, University of Florida, Gainesville, FL 32607, USA.
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Sanchez-Puerta MV, Zubko MK, Palmer JD. Homologous recombination and retention of a single form of most genes shape the highly chimeric mitochondrial genome of a cybrid plant. THE NEW PHYTOLOGIST 2015; 206:381-396. [PMID: 25441621 PMCID: PMC4342287 DOI: 10.1111/nph.13188] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Accepted: 10/14/2014] [Indexed: 05/10/2023]
Abstract
The structure and evolution of angiosperm mitochondrial genomes are driven by extremely high rates of recombination and rearrangement. An excellent experimental system for studying these events is offered by cybrid plants, in which parental mitochondria usually fuse and their genomes recombine. Little is known about the extent, nature and consequences of mitochondrial recombination in these plants. We conducted the first study in which the organellar genomes of a cybrid - between Nicotiana tabacum and Hyoscyamus niger - were sequenced and compared to those of its parents. This cybrid mitochondrial genome is highly recombinant, reflecting at least 30 crossovers and five gene conversions between its parental genomes. It is also surprisingly large (41% and 64% larger than the parental genomes), yet contains single alleles for 90% of mitochondrial genes. Recombination produced a remarkably chimeric cybrid mitochondrial genome and occurred entirely via homologous mechanisms involving the double-strand break repair and/or break-induced replication pathways. Retention of a single form of most genes could be advantageous to minimize intracellular incompatibilities and/or reflect neutral forces that preferentially eliminate duplicated regions. We discuss the relevance of these findings to the surprisingly frequent occurrence of horizontal gene - and genome - transfer in angiosperm mitochondrial DNAs.
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Affiliation(s)
- M Virginia Sanchez-Puerta
- Facultad de Ciencias Exactas y Naturales and Facultad de Ciencias Agrarias, Universidad Nacional de Cuyo & IBAM-CONICET, Chacras de Coria, 5500, Mendoza, Argentina
| | - Mikhajlo K Zubko
- Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, M1 5GD, UK
| | - Jeffrey D Palmer
- Department of Biology, Indiana University, Bloomington, IN, 47405, USA
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Abstract
Why the DNA-containing organelles, chloroplasts, and mitochondria, are inherited maternally is a long standing and unsolved question. However, recent years have seen a paradigm shift, in that the absoluteness of uniparental inheritance is increasingly questioned. Here, we review the field and propose a unifying model for organelle inheritance. We argue that the predominance of the maternal mode is a result of higher mutational load in the paternal gamete. Uniparental inheritance evolved from relaxed organelle inheritance patterns because it avoids the spread of selfish cytoplasmic elements. However, on evolutionary timescales, uniparentally inherited organelles are susceptible to mutational meltdown (Muller's ratchet). To prevent this, fall-back to relaxed inheritance patterns occurs, allowing low levels of sexual organelle recombination. Since sexual organelle recombination is insufficient to mitigate the effects of selfish cytoplasmic elements, various mechanisms for uniparental inheritance then evolve again independently. Organelle inheritance must therefore be seen as an evolutionary unstable trait, with a strong general bias to the uniparental, maternal, mode.
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Affiliation(s)
- Stephan Greiner
- Max-Planck-Institut für Molekulare PflanzenphysiologiePotsdam-Golm, Germany
| | - Johanna Sobanski
- Max-Planck-Institut für Molekulare PflanzenphysiologiePotsdam-Golm, Germany
| | - Ralph Bock
- Max-Planck-Institut für Molekulare PflanzenphysiologiePotsdam-Golm, Germany
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McCauley DE. Paternal leakage, heteroplasmy, and the evolution of plant mitochondrial genomes. THE NEW PHYTOLOGIST 2013; 200:966-77. [PMID: 23952142 DOI: 10.1111/nph.12431] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Accepted: 06/25/2013] [Indexed: 05/25/2023]
Abstract
Plant mitochondrial genomes are usually transmitted to the progeny from the maternal parent. However, cases of paternal transmission are known and are perhaps more common than once thought. This review will consider recent evidence, both direct and indirect, of paternal transmission (leakage) of the mitochondrial genome of seed plants, especially in natural populations, and how this can result in offspring that carry a mixture of maternally and paternally derived copies of the genome; a type of heteroplasmy. It will further consider how this heteroplasmy facilitates recombination between genetically distinct partners; a process that can enhance mitochondrial genotypic diversity. This will then form the basis for a discussion of five evolutionary questions that arise from these observations. Questions include how plant mitochondrial genome evolution can be placed on a sexual to asexual continuum, whether cytoplasmic male sterility (CMS) facilitates the evolution of paternal leakage, whether paternal leakage is more likely in populations undergoing admixture, how leakage influences patterns of gene flow, and whether heteroplasmy occurs in natural populations at a frequency greater than predicted by crossing experiments. It is proposed that each of these questions offers fertile ground for future research on a diversity of plant species.
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Affiliation(s)
- David E McCauley
- Department of Biological Sciences, Vanderbilt University, Nashville, TN, 37235, USA
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