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Mukhopadhyay J, Hausner G. Interconnected roles of fungal nuclear- and intron-encoded maturases: at the crossroads of mitochondrial intron splicing. Biochem Cell Biol 2024. [PMID: 38833723 DOI: 10.1139/bcb-2024-0046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2024] Open
Abstract
Group I and II introns are large catalytic RNAs (ribozymes) that are frequently encountered in fungal mitochondrial genomes. The discovery of respiratory mutants linked to intron splicing defects demonstrated that for the efficient removal of organellar introns there appears to be a requirement of protein splicing factors. These splicing factors can be intron-encoded proteins with maturase activities that usually promote the splicing of the introns that encode them (cis-acting) and/or nuclear-encoded factors that can promote the splicing of a range of different introns (trans-acting). Compared to plants organellar introns, fungal mitochondrial intron splicing is still poorly explored, especially in terms of the synergy of nuclear factors with intron-encoded maturases that has direct impact on splicing through their association with intron RNA. In addition, nuclear-encoded accessory factors might drive the splicing impetus through translational activation, mitoribosome assembly, and phosphorylation-mediated RNA turnover. This review explores protein-assisted splicing of introns by nuclear and mitochondrial-encoded maturases as a means of mitonuclear interplay that could respond to environmental and developmental factors promoting phenotypic adaptation and potentially speciation. It also highlights key evolutionary events that have led to changes in structure and ATP-dependence to accommodate the dual functionality of nuclear and organellar splicing factors.
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Affiliation(s)
| | - Georg Hausner
- Department of Microbiology, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
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Iverson ENK. Conservation Mitonuclear Replacement: Facilitated mitochondrial adaptation for a changing world. Evol Appl 2024; 17:e13642. [PMID: 38468713 PMCID: PMC10925831 DOI: 10.1111/eva.13642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 12/29/2023] [Accepted: 01/03/2024] [Indexed: 03/13/2024] Open
Abstract
Most species will not be able to migrate fast enough to cope with climate change, nor evolve quickly enough with current levels of genetic variation. Exacerbating the problem are anthropogenic influences on adaptive potential, including the prevention of gene flow through habitat fragmentation and the erosion of genetic diversity in small, bottlenecked populations. Facilitated adaptation, or assisted evolution, offers a way to augment adaptive genetic variation via artificial selection, induced hybridization, or genetic engineering. One key source of genetic variation, particularly for climatic adaptation, are the core metabolic genes encoded by the mitochondrial genome. These genes influence environmental tolerance to heat, drought, and hypoxia, but must interact intimately and co-evolve with a suite of important nuclear genes. These coadapted mitonuclear genes form some of the important reproductive barriers between species. Mitochondrial genomes can and do introgress between species in an adaptive manner, and they may co-introgress with nuclear genes important for maintaining mitonuclear compatibility. Managers should consider the relevance of mitonuclear genetic variability in conservation decision-making, including as a tool for facilitating adaptation. I propose a novel technique dubbed Conservation Mitonuclear Replacement (CmNR), which entails replacing the core metabolic machinery of a threatened species-the mitochondrial genome and key nuclear loci-with those from a closely related species or a divergent population, which may be better-adapted to climatic changes or carry a lower genetic load. The most feasible route to CmNR is to combine CRISPR-based nuclear genetic editing with mitochondrial replacement and assisted reproductive technologies. This method preserves much of an organism's phenotype and could allow populations to persist in the wild when no other suitable conservation options exist. The technique could be particularly important on mountaintops, where rising temperatures threaten an alarming number of species with almost certain extinction in the next century.
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Affiliation(s)
- Erik N. K. Iverson
- Department of Integrative BiologyThe University of Texas at AustinAustinTexasUSA
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Iverson ENK, Criswell A, Havird JC. Stronger evidence for relaxed selection than adaptive evolution in high-elevation animal mtDNA. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.20.576402. [PMID: 38328137 PMCID: PMC10849488 DOI: 10.1101/2024.01.20.576402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
Mitochondrial (mt) genes are the subject of many adaptive hypotheses due to the key role of mitochondria in energy production and metabolism. One widespread adaptive hypothesis is that selection imposed by life at high elevation leads to the rapid fixation of beneficial alleles in mtDNA, reflected in the increased rates of mtDNA evolution documented in many high-elevation species. However, the assumption that fast mtDNA evolution is caused by positive, rather than relaxed purifying selection has rarely been tested. Here, we calculated the dN/dS ratio, a metric of nonsynonymous substitution bias, and explicitly tested for relaxed selection in the mtDNA of over 700 species of terrestrial vertebrates, freshwater fishes, and arthropods, with information on elevation and latitudinal range limits, range sizes, and body sizes. We confirmed that mitochondrial genomes of high-elevation taxa have slightly higher dN/dS ratios compared to low-elevation relatives. High-elevation species tend to have smaller ranges, which predict higher dN/dS ratios and more relaxed selection across species and clades, while absolute elevation and latitude do not predict higher dN/dS. We also find a positive relationship between body mass and dN/dS, supporting a role for small effective population size leading to relaxed selection. We conclude that higher mt dN/dS among high-elevation species is more likely to reflect relaxed selection due to smaller ranges and reduced effective population size than adaptation to the environment. Our results highlight the importance of rigorously testing adaptive stories against non-adaptive alternative hypotheses, especially in mt genomes.
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Affiliation(s)
- Erik N K Iverson
- Department of Integrative Biology, the University of Texas at Austin, Austin, TX, United States
| | - Abby Criswell
- Department of Integrative Biology, the University of Texas at Austin, Austin, TX, United States
| | - Justin C Havird
- Department of Integrative Biology, the University of Texas at Austin, Austin, TX, United States
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Nikelski E, Rubtsov AS, Irwin D. High heterogeneity in genomic differentiation between phenotypically divergent songbirds: a test of mitonuclear co-introgression. Heredity (Edinb) 2023; 130:1-13. [PMID: 36463372 PMCID: PMC9814147 DOI: 10.1038/s41437-022-00580-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 11/23/2022] [Accepted: 11/23/2022] [Indexed: 12/05/2022] Open
Abstract
Comparisons of genomic variation among closely related species often show more differentiation in mitochondrial DNA (mtDNA) and sex chromosomes than in autosomes, a pattern expected due to the differing effective population sizes and evolutionary dynamics of these genomic components. Yet, introgression can cause species pairs to deviate dramatically from general differentiation trends. The yellowhammer (Emberiza citrinella) and pine bunting (E. leucocephalos) are hybridizing avian sister species that differ greatly in appearance and moderately in nuclear DNA, but that show no mtDNA differentiation. This discordance is best explained by adaptive mtDNA introgression-a process that can select for co-introgression at nuclear genes with mitochondrial functions (mitonuclear genes). To better understand these discordant differentiation patterns and characterize nuclear differentiation in this system, we investigated genome-wide differentiation between allopatric yellowhammers and pine buntings and compared it to what was seen previously in mtDNA. We found significant nuclear differentiation that was highly heterogeneous across the genome, with a particularly wide differentiation peak on the sex chromosome Z. We further investigated mitonuclear gene co-introgression between yellowhammers and pine buntings and found support for this process in the direction of pine buntings into yellowhammers. Genomic signals indicative of co-introgression were common in mitonuclear genes coding for subunits of the mitoribosome and electron transport chain complexes. Such introgression of mitochondrial DNA and mitonuclear genes provides a possible explanation for the patterns of high genomic heterogeneity in genomic differentiation seen among some species groups.
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Affiliation(s)
- Ellen Nikelski
- Department of Zoology, and Biodiversity Research Centre, 6270 University Blvd., University of British Columbia, Vancouver, BC, Canada.
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON, Canada.
| | | | - Darren Irwin
- Department of Zoology, and Biodiversity Research Centre, 6270 University Blvd., University of British Columbia, Vancouver, BC, Canada
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Kyrgiafini MA, Giannoulis T, Moutou KA, Mamuris Z. Investigating the Impact of a Curse: Diseases, Population Isolation, Evolution and the Mother's Curse. Genes (Basel) 2022; 13:2151. [PMID: 36421825 PMCID: PMC9690142 DOI: 10.3390/genes13112151] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/13/2022] [Accepted: 11/15/2022] [Indexed: 09/08/2024] Open
Abstract
The mitochondrion was characterized for years as the energy factory of the cell, but now its role in many more cellular processes is recognized. The mitochondrion and mitochondrial DNA (mtDNA) also possess a set of distinct properties, including maternal inheritance, that creates the Mother's Curse phenomenon. As mtDNA is inherited from females to all offspring, mutations that are harmful to males tend to accumulate more easily. The Mother's Curse is associated with various diseases, and has a significant effect on males, in many cases even affecting their reproductive ability. Sometimes, it even leads to reproductive isolation, as in crosses between different populations, the mitochondrial genome cannot cooperate effectively with the nuclear one resulting in a mito-nuclear incompatibility and reduce the fitness of the hybrids. This phenomenon is observed both in the laboratory and in natural populations, and have the potential to influence their evolution and speciation. Therefore, it turns out that the study of mitochondria is an exciting field that finds many applications, including pest control, and it can shed light on the molecular mechanism of several diseases, improving successful diagnosis and therapeutics. Finally, mito-nuclear co-adaptation, paternal leakage, and kin selection are some mechanisms that can mitigate the impact of the Mother's Curse.
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Affiliation(s)
- Maria-Anna Kyrgiafini
- Laboratory of Genetics, Comparative and Evolutionary Biology, Department of Biochemistry and Biotechnology, University of Thessaly, Viopolis, Mezourlo, 41500 Larissa, Greece
| | - Themistoklis Giannoulis
- Laboratory of Biology, Genetics and Bioinformatics, Department of Animal Sciences, University of Thessaly, Gaiopolis, 41336 Larissa, Greece
| | - Katerina A. Moutou
- Laboratory of Genetics, Comparative and Evolutionary Biology, Department of Biochemistry and Biotechnology, University of Thessaly, Viopolis, Mezourlo, 41500 Larissa, Greece
| | - Zissis Mamuris
- Laboratory of Genetics, Comparative and Evolutionary Biology, Department of Biochemistry and Biotechnology, University of Thessaly, Viopolis, Mezourlo, 41500 Larissa, Greece
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Guo M, Yuan C, Tao L, Cai Y, Zhang W. Life barcoded by DNA barcodes. CONSERV GENET RESOUR 2022; 14:351-365. [PMID: 35991367 PMCID: PMC9377290 DOI: 10.1007/s12686-022-01291-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 08/05/2022] [Indexed: 11/15/2022]
Abstract
The modern concept of DNA-based barcoding for cataloguing biodiversity was proposed in 2003 by first adopting an approximately 600 bp fragment of the mitochondrial COI gene to compare via nucleotide alignments with known sequences from specimens previously identified by taxonomists. Other standardized regions meeting barcoding criteria then are also evolving as DNA barcodes for fast, reliable and inexpensive assessment of species composition across all forms of life, including animals, plants, fungi, bacteria and other microorganisms. Consequently, global DNA barcoding campaigns have resulted in the formation of many online workbenches and databases, such as BOLD system, as barcode references, and facilitated the development of mini-barcodes and metabarcoding strategies as important extensions of barcode techniques. Here we intend to give an overview of the characteristics and features of these barcode markers and major reference libraries existing for barcoding the planet’s life, as well as to address the limitations and opportunities of DNA barcodes to an increasingly broader community of science and society.
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Young MK, Smith R, Pilgrim KL, Isaak DJ, McKelvey KS, Parkes S, Egge J, Schwartz MK. A Molecular Taxonomy of Cottus in western North America. WEST N AM NATURALIST 2022. [DOI: 10.3398/064.082.0208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Michael K. Young
- USDA Forest Service, National Genomics Center for Wildlife and Fish Conservation, Rocky Mountain Research Station, 800 E. Beckwith Avenue, Missoula, MT 59802
| | - Rebecca Smith
- USDA Forest Service, National Genomics Center for Wildlife and Fish Conservation, Rocky Mountain Research Station, 800 E. Beckwith Avenue, Missoula, MT 59802
| | - Kristine L. Pilgrim
- USDA Forest Service, National Genomics Center for Wildlife and Fish Conservation, Rocky Mountain Research Station, 800 E. Beckwith Avenue, Missoula, MT 59802
| | - Daniel J. Isaak
- USDA Forest Service, Rocky Mountain Research Station, 322 East Front Street Suite 401, Boise, ID 83702
| | - Kevin S. McKelvey
- USDA Forest Service, National Genomics Center for Wildlife and Fish Conservation, Rocky Mountain Research Station, 800 E. Beckwith Avenue, Missoula, MT 59802
| | - Sharon Parkes
- USDA Forest Service, Rocky Mountain Research Station, 322 East Front Street Suite 401, Boise, ID 83702
| | - Jacob Egge
- Department of Biology, Pacific Lutheran University, Tacoma, WA 98447
| | - Michael K. Schwartz
- USDA Forest Service, National Genomics Center for Wildlife and Fish Conservation, Rocky Mountain Research Station, 800 E. Beckwith Avenue, Missoula, MT 59802
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Christinaki AC, Kanellopoulos SG, Kortsinoglou AM, Andrikopoulos MΑ, Theelen B, Boekhout T, Kouvelis VN. Mitogenomics and mitochondrial gene phylogeny decipher the evolution of Saccharomycotina yeasts. Genome Biol Evol 2022; 14:6586520. [PMID: 35576568 PMCID: PMC9154068 DOI: 10.1093/gbe/evac073] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/12/2022] [Indexed: 11/17/2022] Open
Abstract
Saccharomycotina yeasts belong to diverse clades within the kingdom of fungi and are important to human everyday life. This work investigates the evolutionary relationships among these yeasts from a mitochondrial (mt) genomic perspective. A comparative study of 155 yeast mt genomes representing all major phylogenetic lineages of Saccharomycotina was performed, including genome size and content variability, intron and intergenic regions’ diversity, genetic code alterations, and syntenic variation. Findings from this study suggest that mt genome size diversity is the result of a ceaseless random process, mainly based on genetic recombination and intron mobility. Gene order analysis revealed conserved syntenic units and many occurring rearrangements, which can be correlated with major evolutionary events as shown by the phylogenetic analysis of the concatenated mt protein matrix. For the first time, molecular dating indicated a slower mt genome divergence rate in the early stages of yeast evolution, in contrast with a faster rate in the late evolutionary stages, compared to their nuclear time divergence. Genetic code reassignments of mt genomes are a perpetual process happening in many different parallel evolutionary steps throughout the evolution of Saccharomycotina. Overall, this work shows that phylogenetic studies based on the mt genome of yeasts highlight major evolutionary events.
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Affiliation(s)
- Anastasia C Christinaki
- National and Kapodistrian University of Athens, Faculty of Biology, Department of Genetics and Biotechnology, Athens, Greece
| | - Spyros G Kanellopoulos
- National and Kapodistrian University of Athens, Faculty of Biology, Department of Genetics and Biotechnology, Athens, Greece
| | - Alexandra M Kortsinoglou
- National and Kapodistrian University of Athens, Faculty of Biology, Department of Genetics and Biotechnology, Athens, Greece
| | - Marios Α Andrikopoulos
- National and Kapodistrian University of Athens, Faculty of Biology, Department of Genetics and Biotechnology, Athens, Greece
| | - Bart Theelen
- Westerdijk Fungal Biodiversity Institute, Utrecht, The Netherlands
| | - Teun Boekhout
- Westerdijk Fungal Biodiversity Institute, Utrecht, The Netherlands.,University of Amsterdam, Institute of Biodiversity and Ecosystem Dynamics (IBED), Amsterdam, The Netherlands
| | - Vassili N Kouvelis
- National and Kapodistrian University of Athens, Faculty of Biology, Department of Genetics and Biotechnology, Athens, Greece
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Zhou J, Zhang S, Wang J, Shen H, Ai B, Gao W, Zhang C, Fei Q, Yuan D, Wu Z, Tembrock LR, Li S, Gu C, Liao X. Chloroplast genomes in Populus (Salicaceae): comparisons from an intensively sampled genus reveal dynamic patterns of evolution. Sci Rep 2021; 11:9471. [PMID: 33947883 PMCID: PMC8096831 DOI: 10.1038/s41598-021-88160-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 04/06/2021] [Indexed: 02/02/2023] Open
Abstract
The chloroplast is one of two organelles containing a separate genome that codes for essential and distinct cellular functions such as photosynthesis. Given the importance of chloroplasts in plant metabolism, the genomic architecture and gene content have been strongly conserved through long periods of time and as such are useful molecular tools for evolutionary inferences. At present, complete chloroplast genomes from over 4000 species have been deposited into publicly accessible databases. Despite the large number of complete chloroplast genomes, comprehensive analyses regarding genome architecture and gene content have not been conducted for many lineages with complete species sampling. In this study, we employed the genus Populus to assess how more comprehensively sampled chloroplast genome analyses can be used in understanding chloroplast evolution in a broadly studied lineage of angiosperms. We conducted comparative analyses across Populus in order to elucidate variation in key genome features such as genome size, gene number, gene content, repeat type and number, SSR (Simple Sequence Repeat) abundance, and boundary positioning between the four main units of the genome. We found that some genome annotations were variable across the genus owing in part from errors in assembly or data checking and from this provided corrected annotations. We also employed complete chloroplast genomes for phylogenetic analyses including the dating of divergence times throughout the genus. Lastly, we utilized re-sequencing data to describe the variations of pan-chloroplast genomes at the population level for P. euphratica. The analyses used in this paper provide a blueprint for the types of analyses that can be conducted with publicly available chloroplast genomes as well as methods for building upon existing datasets to improve evolutionary inference.
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Affiliation(s)
- Jiawei Zhou
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518120, China
| | - Shuo Zhang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518120, China
| | - Jie Wang
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518120, China
- School of Landscape and Architecture, Zhejiang Provincial Key Laboratory of Germplasm Innovation and Utilization for Garden Plants, Key Laboratory of National Forestry and Grassland Administration on Germplasm Innovation and Utilization for Southern Garden Plants, Zhejiang A & F University, Hangzhou, 311300, China
| | - Hongmei Shen
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518120, China
- The Second Peoples's Hospital of Nantong, Nantong, 226000, Jiangsu, China
| | - Bin Ai
- Foshan Green Development Innovation Research Institute, Foshan, 528000, Guangdong, China
| | - Wei Gao
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518120, China
| | - Cuijun Zhang
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518120, China
| | - Qili Fei
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518120, China
| | - Daojun Yuan
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Zhiqiang Wu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518120, China
- The College of Horticulture, Shanxi Agricultural University, Taigu, 030801, Shanxi, China
| | - Luke R Tembrock
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO, 80523, USA.
| | - Sen Li
- The College of Horticulture, Shanxi Agricultural University, Taigu, 030801, Shanxi, China.
| | - Cuihua Gu
- School of Landscape and Architecture, Zhejiang Provincial Key Laboratory of Germplasm Innovation and Utilization for Garden Plants, Key Laboratory of National Forestry and Grassland Administration on Germplasm Innovation and Utilization for Southern Garden Plants, Zhejiang A & F University, Hangzhou, 311300, China.
| | - Xuezhu Liao
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518120, China.
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