2003
DOI: 10.2307/3647348
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Chromosome Studies in the Grass Subfamily Chloridoideae. II. An Analysis of Polyploidy

Abstract: Polyploidy is frequent among the grasses. This study indicates that it has a high frequency in the subfamily Chloridoideae, where more than 90% of the studied specimens are polyploids. These levels range from diploid (2n = 20 for x = 10 and 2n = 18 for x = 9) to 16-ploid (2n = 160) for x = 10 in Ctenium concinnum Nees and 20-ploid (2n = 180) for x = 9 in Hilaria mutica Benth. This polyploid trend is seen in southern Africa, as well as worldwide. Analysis indicates that many polyploids are alloploids, suggestin… Show more

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Cited by 9 publications
(11 citation statements)
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“…Teff belongs to the Chloridoideae subfamily of grasses 27 which includes important drought and heat tolerant C4 species such as the orphan grain crop finger millet and model desiccation tolerant plants in the genera Oropetium, Eragrostis, Tripogon, Sporobolus , and others. Most (∼90%) of surveyed Chloridoideae species are polyploid, including many of the aforementioned taxa, and this likely contributes to their diversity and stress tolerance 16 . We utilized the wealth of genomic resources within Chloridoideae and more generally across Poaceae to identify patterns associated with improved stress tolerance, polyploidy and genome evolution in teff.…”
Section: Resultsmentioning
confidence: 99%
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“…Teff belongs to the Chloridoideae subfamily of grasses 27 which includes important drought and heat tolerant C4 species such as the orphan grain crop finger millet and model desiccation tolerant plants in the genera Oropetium, Eragrostis, Tripogon, Sporobolus , and others. Most (∼90%) of surveyed Chloridoideae species are polyploid, including many of the aforementioned taxa, and this likely contributes to their diversity and stress tolerance 16 . We utilized the wealth of genomic resources within Chloridoideae and more generally across Poaceae to identify patterns associated with improved stress tolerance, polyploidy and genome evolution in teff.…”
Section: Resultsmentioning
confidence: 99%
“…The general stability of the teff subgenomes may be attributed to low rates of homoeologous exchange. An estimated 90% of Chloridoid grasses are polyploid and among the allopolyploid species, multivalent pairing is rarely detected 16 . The twenty chromosome pairs in teff show bivalent pairing in meiosis I 22 , and double reduction has not been observed in segregating populations 42,43 .…”
Section: Discussionmentioning
confidence: 99%
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“…Within the subfamily Chloridoideae there is a high frequency of polyploids ranging from diploid to 20-ploid (Pleuraphis mutica Buckley, not sampled in our study) and many of these are thought to be alloploids suggesting extensive hybridization (Roodt and Spies, 2003). The common base chromosome number for all chloridoid tribes treated here is x = 10 and this is the predominant number found in the Triraphideae, Eragrostideae, Zoysieae, and Cynodonteae.…”
Section: Cytologymentioning
confidence: 86%
“…Other than a chromosome count of N ¼ 12 for A. macrocarpa (Burtt, 1991), the chromosome numbers are not known for any other member of the Annesorhiza clade, and they would be important to know to confirm polyploidy, if it exists. While the extent of hybridization in the southern Africa flora is poorly known, numerous examples of naturally occurring hybrids have been reported (Goldblatt, 1978;Spies et al, 1987;Takatsu et al, 2001;Roodt and Spies, 2003). Although no interspecific hybridization has been reported for the largely sympatric Annesorhiza and Chamarea, hypotheses of relationships based on morphology show considerable incongruence in the data, with many species not very well separated .…”
Section: Discussionmentioning
confidence: 99%