DNA variation in Festuca

Seal, Abhik

doi:10.1038/hdy.1983.26

Cited by 72 publications

(37 citation statements)

References 18 publications

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“…The 1Cx value for F. arundinacea was 11% lower as compared to that of F. pratensis ( table 2 ). This difference could be due to the reduction in genome size known to take place following polyploidization [Leitch and Bennett, 2004], and which was also observed in Festuca [Seal, 1983;Loureiro et al, 2007]. On the other hand, the 1Cx values for both cultivars of L. perenne ( table 2 ) were statistically not different from the estimates for L. multiflorum with the same ploidy level.…”

Section: Resultsmentioning

confidence: 55%

Physical Distribution of Homoeologous Recombination in Individual Chromosomes of Festuca pratensis in Lolium multiflorum

Kopecký

Havránková

Loureiro

et al. 2010

Cytogenet Genome Res

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Crossing over-based recombination is a powerful tool for generating new allelic combinations during sexual reproduction. It usually occurs between homologous chromosomes. However, under some conditions, homoeologues may also be capable of crossing over. Whether homologous and homoeologous crossovers are equivalent and governed by the same rules has never been established. Here we report on chromosome distribution of homoeologous crossovers in a unique system of Festuca × Lolium hybrids. Unlike in most other hybrids, in these intergeneric hybrids, homoeologous chromosomes are capable of pairing and crossing over with frequencies approaching that of homologues. At the same time, genome divergence makes cytological detection of chromosome recombination feasible. We analyzed the distribution of homoeologous recombination along individual chromosomes in a complete set of intergeneric single chromosome substitutions fromF. pratensisinto tetraploid L. multiflorum. Homoeologous recombination sites were not evenly distributed along the chromosomes, being concentrated in intercalary regions of the arms and reduced in proximal and distal regions. Several recombination hotspots and cold spots were found along individual chromosomes and the recombination was not affected by the presence of a secondary constriction. Our results indicate that despite the uneven distribution of homoeologous recombination, introgression of any part of the F. pratensis genome into L. multiflorum is feasible.

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Section: Resultsmentioning

confidence: 55%

Physical Distribution of Homoeologous Recombination in Individual Chromosomes of Festuca pratensis in Lolium multiflorum

Kopecký

Havránková

Loureiro

et al. 2010

Cytogenet Genome Res

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“…This discrepancy between C value of diploids and tetraploids has also been reported in other genera e.g. in Festuca (Seal, 1983). Loss of DNA in the polyploids or errors in the proposed mode of origin of the polypoids have been suggested to explain the apparent anomalies.…”

Section: Dna C Value Determinationmentioning

confidence: 83%

Variation in DNA C value in natural populations of Dactylis glomerata L.

et al. 1994

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SUMMARYDNA C values were determined for eighteen natural populations of Dactylis glomerata L. collected from various sites in Europe to examine the extent of intraspecific variation in C value and how this variation may be related to latitude and altitude of origin. A sub-set (8) of these populations represent an altitudinal transect (350-1120 m) in northern Spain whilst the remainder represent a latitudinal range (38-53-57-47 °N), Preliminary experiments established optimum acid hydrolysis times for the Feulgen reaction of 62 min and 20 min for D. glomerata c\. S26 and the standard Hordeum vulgare L. cv. Sultan (C = 5-6 pg), respectively. The data emphasize the necessity of using the optimum hydrolysis time for both the standard and unknowns for C value determination, whether using 5 M HCl at 25 °C or 1 M HCl at 60 °C. This procedure has not been followed in the majority of published estimates of C value.Seventeen of the natural populations were tetraploid (2« = 4,v = 28) whilst the southernmost population was diploid {2u = 2x = 14), The 17 tetraploid populations exhibited a 28-7 "o variation in DNA C value, ranging from 4-35 to 5-60 pg, whilst the C value of the diploid population was 3-3 pg. There was neither a significant relationship between the C value and latitude of origin of the 10 populations which comprised the latitudinal transect (1 diploid and 9 tetraploid) nor with the tetraploids alone. However, the C values of the eight populations which formed the altitudinal transect in the Galicia mountains in N. Spain were negatively correlated with their altitude of origin. Possible reasons for this relationship are discussed.

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“…The data on meiotic behaviour, fertility and size of pollen and karyotype analyses have been published in previous papers (Gonzfilez-Aguilera et al, 1980a, 1980bGonzMez-Aguilera & FermindezPeralta, 1981, 1983; Fern~indez-Peralta & Gon- , 1982). However, data on pollen size and karyotype length are summarized in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…However, differences between the two genera have not been found (it is necessary to bear in mind that we have fewer available data on the genus Sesamoides than on Reseda). The general correlation between ploidy level and DNA amount is not always found in these species, similarly to Betula (Grant, 1969;Taper & Grant, 1973), Leucanthemum (Probst, 1972), Brassiea (Verma & Rees, 1974), Luzula (Barlow & Nevin, 1976) and Festuca (Seal, 1983). In this sense we must admit a DNA amount decrease (35.8%) in the 4x in regard to the 2x level in the sectio n Phyteuma.…”

Section: Nucleotypic Parametersmentioning

confidence: 99%

Phylogenetic relationships in the family Resedaceae L.

González-Aguilera

Fernández-Peralta

1984

Genetica

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A study was made on the phylogenetic relationships of species of the family Resedaceae, based on morphological features, chromosome meiotic behaviour, karyotype features, size and fertility of pollen grains, nucleotypic parameters, seed protein profiles and esterase isozyme patterns.For the comparison of the seed protein profiles among species a method was developed based on the presence or absence of the bands by means of a computer program. The dendrogram obtained by such a method is in line, to a great extent, with the clusters (sections) obtained within the family based on morphological features.Data on meiotic behaviour and on morphology, such as the type of fruit, carpel numbers and others, suggest that x = 5 is the primitive basic chromosome number of this family, x 1 = 6 and x2 --7 are considered as secondary basic numbers derived from x = 5 through aneuploid changes.The results support a proposed phylogenetic tree of the genera and sections of the genus Reseda represented in the European Flora. The principal phenomena that have operated in the evolution of the Resedaceae seem to be aneuploid changes, polyploidy and structural rearrangements. A trend towards DNA increase in the evolution of this group is also apparent.

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DNA variation in Festuca

Cited by 72 publications

References 18 publications

Physical Distribution of Homoeologous Recombination in Individual Chromosomes of <i>Festuca pratensis </i>in <i>Lolium multiflorum</i>

Physical Distribution of Homoeologous Recombination in Individual Chromosomes of <i>Festuca pratensis </i>in <i>Lolium multiflorum</i>

Variation in DNA C value in natural populations of Dactylis glomerata L.

Phylogenetic relationships in the family Resedaceae L.

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