Poaceae

Roodt, Rouvay; Spies, J. J.

doi:10.4102/abc.v32i2.492

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…*, asterisks represent presumed ancestors of Eragrostis tef in Girma et al (2018). a chromosome numbers from references: 1 (Gould and Soderstrom, 1970a); 2 (Davidse and Pohl, 1974); 3 (Spies and Jonker, 1987); 4 (Roodt and Spies, 2002); 5 (Roodt and Spies, 2003a); 6 (Cave, 1959a); 7 (Femandes and Queiros, 1969); 8 (Faruqi et al, 1987); 9 (Bir, 1983); 10 (Gohil, 1986); 11 (Spies and Voges, 1988); 12 (Roodt and Spies, 2003b); 13 (Darlington and Wylie, 1956); 14 (Tateoka and Löve, 1967); 15 (JMJ, 1954); 16 (Cave, 1959b); 17 (Gould, 1968); 18 (Reeder, 1971); 19 (Ornduff, 1969); 20 (Mehra, 1982); 21 (Sahni and Bir, 1985); 22 (Bir and Sahni, 1988); 23 (Christopher and Abraham, 1974); 24 (Kumar, 1987); 25 (Majovsky, 1974); 26 (Ghukasyan, 2004); 27 (Devesa, 1990); 28 (Moore, 1982); 29 (Goldblatt, 1981); 30 (Gould and Soderstrom, 1974); 31 (Cave, 1962); 32 (Löve, 1970); 33 (Gould and Soderstrom, 1970b); 34 (Dujardin and Tilquin, 1971); 35 (Murin et al, 2000); 36 (Marhold, 2006); 37 (Nirmala and Rao, 1981); 38 (Fernandes, 1971); 39 (Chepinoga et al, 2009); 40 (Gould and Soderstrom, 1967); 41 (Nordenstam, 1969); 42 (Spies et ...…”

Section: Environmental Datamentioning

confidence: 99%

Genome size variation and polyploidy prevalence in the genus Eragrostis are associated with the global dispersal in arid area

Hutang

Tong²,

Zhu³

et al. 2023

Front. Plant Sci.

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BackgroundBiologists have long debated the drivers of the genome size evolution and variation ever since Darwin. Assumptions for the adaptive or maladaptive consequences of the associations between genome sizes and environmental factors have been proposed, but the significance of these hypotheses remains controversial. Eragrostis is a large genus in the grass family and is often used as crop or forage during the dry seasons. The wide range and complex ploidy levels make Eragrostis an excellent model for investigating how the genome size variation and evolution is associated with environmental factors and how these changes can ben interpreted.MethodsWe reconstructed the Eragrostis phylogeny and estimated genome sizes through flow cytometric analyses. Phylogenetic comparative analyses were performed to explore how genome size variation and evolution is related to their climatic niches and geographical ranges. The genome size evolution and environmental factors were examined using different models to study the phylogenetic signal, mode and tempo throughout evolutionary history.ResultsOur results support the monophyly of Eragrostis. The genome sizes in Eragrostis ranged from ~0.66 pg to ~3.80 pg. We found that a moderate phylogenetic conservatism existed in terms of the genome sizes but was absent from environmental factors. In addition, phylogeny-based associations revealed close correlations between genome sizes and precipitation-related variables, indicating that the genome size variation mainly caused by polyploidization may have evolved as an adaptation to various environments in the genus Eragrostis.ConclusionThis is the first study to take a global perspective on the genome size variation and evolution in the genus Eragrostis. Our results suggest that the adaptation and conservatism are manifested in the genome size variation, allowing the arid species of Eragrostis to spread the xeric area throughout the world.

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Section: Environmental Datamentioning

confidence: 99%

Genome size variation and polyploidy prevalence in the genus Eragrostis are associated with the global dispersal in arid area

Hutang

Tong²,

Zhu³

et al. 2023

Front. Plant Sci.

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Reconstructing ancestral chromosome numbers and inflorescence features in Eleusininae (Poaceae: Chloridoideae: Cynodonteae)

Chiavegatto

Carta

Pereira

et al. 2020

Botanical Journal of the Linnean Society

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The chromosome number in Poaceae has changed widely over 77 Myr of evolution and polyploidization. Chromosome number changes can suggest a high rate of diversification and evolutionary novelties, and such changes can contribute to speciation. Despite this, chromosome numbers alone do not allow the evolutionary history of a group to be traced. Combined phylogenetic and karyological analyses can clarify the evolutionary history of taxa and allow taxonomic relationships and hierarchical levels to be inferred. The subtribe Eleusininae is the largest of the subfamily Chloridoideae. This study aims to reconstruct their chromosome number evolution, for which ChromEvol 2.0 software was used. Haploid chromosome numbers of Eleusininae were retrieved from the literature, and a consensus phylogenetic tree of Eleusininae was reconstructed. It was possible to infer 41 events of chromosome rearrangements along the evolutionary history of Eleusininae, according to the probabilistic model used. Chromosome number evolution in Eleusininae was mainly influenced by polyploidy events. The ancestral basic chromosome number for Eleusininae was p = 6, but the most recent common ancestor showed p2 = 10. In addition, some derived basic chromosome numbers, such as x = 9, arose through dysploidy, whereas x = 20 was generated via polyploidy.

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Poaceae

Abstract: CHROMOSOME STUDIES ON AFRICAN PLANTS. 17. THE SUBFAMILIES ARUNDINOIDEAE AND DANTHONIOIDEAE

Cited by 2 publications

References 24 publications

Genome size variation and polyploidy prevalence in the genus Eragrostis are associated with the global dispersal in arid area

Genome size variation and polyploidy prevalence in the genus Eragrostis are associated with the global dispersal in arid area

Reconstructing ancestral chromosome numbers and inflorescence features in Eleusininae (Poaceae: Chloridoideae: Cynodonteae)

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