Evolution of genome size inAllium (Alliaceae)

Ohri, Deepak; Fritsch, Reinhard; Hanelt, Peter

doi:10.1007/bf00984728

Cited by 80 publications

(45 citation statements)

References 55 publications

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“…The Mediterranean species often occupy arid places or are rupicolous (Staehelina), although we did not find a significant variation between DNA content and habitat. Ohri et al (1998) found that temperate Allium species have higher 2C values than those of warm places. Also, xeric Coffea species show small genome sizes (Ohri, 1998).…”

Section: Ecological and Life Cycle Implicationsmentioning

confidence: 97%

Genome size in Echinops L. and related genera (Asteraceae, Cardueae): karyological, ecological and phylogenetic implications

Garnatje

Vallès

Garcia

et al. 2004

Biology of the Cell

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Genome size was assessed by flow cytometry in 33 species belonging to seven genera of the tribe Cardueae (Asteraceae), which can be grouped in three taxonomic complexes. 2C nuclear DNA content ranged from 1.49 to 16.98 pg, which is more than elevenfold variation. Genome size correlated well with some karyological traits. Nuclear DNA amount variations also have systematic and evolutionary implications and/or are linked to adaptations to ecological conditions.

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Section: Ecological and Life Cycle Implicationsmentioning

confidence: 97%

Genome size in Echinops L. and related genera (Asteraceae, Cardueae): karyological, ecological and phylogenetic implications

Garnatje

Vallès

Garcia

et al. 2004

Biology of the Cell

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“…Another explanation is that garlic lost introns; analysis of the catalase gene family has shown that reverse transcription and subsequent replacement by homologous recombination is an active mechanism of intron loss in plants (Frugoli et al, 1998). The nuclear genome of garlic is 7% smaller than that of onion (Ori et al, 1998), and intron loss may have contributed to this significant reduction in genome size.…”

Section: Genomic Sequence Analysesmentioning

confidence: 99%

“…Tandem duplications also have expanded the maize genome (Veit et al, 1990;Hulbert and Bennetzen, 1991;Robbins et al, 1991). Plants in the Asparagales, especially in the genus Allium , possess some of the largest genomes known among all eukaryotes (Labani and Elkington, 1987;Ori et al, 1998). Onion is a diploid (2 n ϭ 2 x ϭ 16) with a nuclear genome of 16,415 Mbp per 1C,approximately equal to hexaploid wheat and ‫ف‬ 34 and 6 times larger than rice and maize, respectively (Arumuganathan and Earle, 1991).…”

Section: Introductionmentioning

confidence: 99%

A Unique Set of 11,008 Onion Expressed Sequence Tags Reveals Expressed Sequence and Genomic Differences between the Monocot Orders Asparagales and Poales[W]

Kuhl

Cheung²,

Yuan³

et al. 2004

The Plant Cell

156

151

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Enormous genomic resources have been developed for plants in the monocot order Poales; however, it is not clear how representative the Poales are for the monocots as a whole. The Asparagales are a monophyletic order sister to the lineage carrying the Poales and possess economically important plants such as asparagus, garlic, and onion. To assess the genomic differences between the Asparagales and Poales, we generated 11,008 unique ESTs from a normalized cDNA library of onion. Sequence analyses of these ESTs revealed microsatellite markers, single nucleotide polymorphisms, and homologs of transposable elements. Mean nucleotide similarity between rice and the Asparagales was 78% across coding regions. Expressed sequence and genomic comparisons revealed strong differences between the Asparagales and Poales for codon usage and mean GC content, GC distribution, and relative GC content at each codon position, indicating that genomic characteristics are not uniform across the monocots. The Asparagales were more similar to eudicots than to the Poales for these genomic characteristics.

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“…This has been found in allopolyploids of the genera Triticum L., Arachis L., Glycine Willd., and Allium L. (Rees & Walters, 1965;Hammatt & al., 1991;Sing & al., 1996;Ohri & al., 1998). However, genome downsizing following polyploidy has been detected in other species including Brassica L. and Nicotiana L. allopolyploids (Ozkan & al., 2003).…”

Section: Genome Size Estimationsmentioning

confidence: 99%

Cytogenetic relationships within the Maghrebian clade of <em>Festuca</em> subgen. <em>Schedonorus</em> (Poaceae), using flow cytometry and FISH

Ezquerro-López

Kopecký

Inda

2017

Anal. Jard. Bot. Madr.

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Festuca subgen. Schedonorus is a group of broad-leaved fescues, which can be divided into two clades: European and Maghrebian. We employed fluorescent in situ hybridization —FISH— with probes specific for 5S and 35S ribosomal DNA and genome size estimation using flow cytometry to shed light on the determination of possible parental genomes of polyploid species of the Maghrebian clade. Our results indicate that octoploid F. arundinacea subsp. atlantigena probably originated from crossing of the tetraploids F. arundinacea subsp. fenas —2n = 4x = 28— and F. mairei —2n = 4x = 28— followed by whole genome duplication. However, a large reconstruction of karyotype and genome downsizing has been revealed. Similarly, hexaploid F. arundinacea subsp. corsica presumably resulted from the interspecific hybridization of the diploid F. pratensis and tetraploid F. arundinacea subsp. fenas. Several scenarios on the origin of decaploid F. arundinacea var. letourneuxiana are discussed. This study contributed to our knowledge on the phylogeny of broad-leaved fescues and provided new information on the karyotypes —chromosome numbers, ploidy levels and numbers and positions of rDNA loci— using FISH and genome size estimations using flow cytometry in selected taxa of this important grass genus.

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Evolution of genome size inAllium (Alliaceae)

Cited by 80 publications

References 55 publications

Genome size in Echinops L. and related genera (Asteraceae, Cardueae): karyological, ecological and phylogenetic implications

Genome size in Echinops L. and related genera (Asteraceae, Cardueae): karyological, ecological and phylogenetic implications

A Unique Set of 11,008 Onion Expressed Sequence Tags Reveals Expressed Sequence and Genomic Differences between the Monocot Orders Asparagales and Poales[W]

Cytogenetic relationships within the Maghrebian clade of <em>Festuca</em> subgen. <em>Schedonorus</em> (Poaceae), using flow cytometry and FISH

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