Chromosome Associations at Diakinesis in the Cultivated Strawberry

Mok, David W. S.; Evans, W. D.

doi:10.1139/g71-040

Cited by 12 publications

(8 citation statements)

References 7 publications

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“…Bivalents are usually observed in Fragaria during meiosis (Ichijima 1926;Longley 1926;Powers 1944), with the exception of multivalents mentioned by Mok and Evans (1971) but rejected by Ibrahim et al (1981) since chromosomes have been observed during diakinesis. Finally, the type of segregation that occurs in octoploid Fragaria (i.e., disomic or polysomic) has remained unclear.…”

Section: Discussionmentioning

confidence: 99%

Comparative Genetic Mapping Between Octoploid and Diploid Fragaria Species Reveals a High Level of Colinearity Between Their Genomes and the Essentially Disomic Behavior of the Cultivated Octoploid Strawberry

Rousseau‐Gueutin

Lerceteau-Köhler²,

Barrot³

et al. 2008

Genetics

146

195

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Macrosynteny and colinearity between Fragaria (strawberry) species showing extreme levels of ploidy have been studied through comparative genetic mapping between the octoploid cultivated strawberry (F. 3ananassa) and its diploid relatives. A comprehensive map of the octoploid strawberry, in which almost all linkage groups are ranged into the seven expected homoeologous groups was obtained, thus providing the first reference map for the octoploid Fragaria. High levels of conserved macrosynteny and colinearity were observed between homo(eo)logous linkage groups and between the octoploid homoeologous groups and their corresponding diploid linkage groups. These results reveal that the polyploidization events that took place along the evolution of the Fragaria genus and the more recent juxtaposition of two octoploid strawberry genomes in the cultivated strawberry did not trigger any major chromosomal rearrangements in genomes involved in F. 3ananassa. They further suggest the existence of a close relationship between the diploid Fragaria genomes. In addition, despite the possible existence of residual levels of polysomic segregation suggested by the observation of large linkage groups in coupling phase only, the prevalence of linkage groups in coupling/repulsion phase clearly demonstrates that the meiotic behavior is mainly disomic in the cultivated strawberry.

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Section: Discussionmentioning

confidence: 99%

Comparative Genetic Mapping Between Octoploid and Diploid Fragaria Species Reveals a High Level of Colinearity Between Their Genomes and the Essentially Disomic Behavior of the Cultivated Octoploid Strawberry

Rousseau‐Gueutin

Lerceteau-Köhler²,

Barrot³

et al. 2008

Genetics

146

195

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“…This is the first study which suggests a mixed meiotic behavior of the genome of F. ananassa. Most cytological studies of the species have demonstrated that bivalent-pairing occurs regularly in F. ananassa (Ichijima 1926;Longley 1926;Powers 1944) with the exception of Mok and Evans (1971), where multivalents were observed, attributed to secondary associations of bivalents referred to as pseudo-multivalents (Ibrahim et al 1981). Byrne and Jelenkovic (1976) confirmed in a larger study that all the chromosomes paired as bivalents, and concluded that the species displayed cytological diploidisation.…”

Section: Genome Behavior and Compositionmentioning

confidence: 99%

Characterization of mixed disomic and polysomic inheritance in the octoploid strawberry (Fragaria × ananassa) using AFLP mapping

et al. 2003

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A two-way pseudo-testcross strategy, combined with Single Dose Restriction Fragment (SDRF) marker analysis, was used for genetic mapping in the octoploid cultivated strawberry Fragaria x ananassa (2n = 8 x = 56). Based on a 113 full-sib progeny from a cross between the variety Capitola and the clone CF1116, we generated two parental maps using Amplified Fragment Length Polymorphism (AFLP) markers. Ninety two percent of the markers (727 out of 789) showed ratios corresponding to simplex markers (the majority being SDRF markers), and 8% (62 out of 789) fitted a multiplex ratio. Linkage maps were first established using SDRF markers in coupling phase. The female map comprised 235 markers distributed among 43 co-segregation groups, giving a map size of 1,604 cM. On the male map, 280 markers were assigned to 43 co-segregation groups, yielding a map size of 1,496 cM. Once the co-segregation groups were established, their association was tested using repulsion-phase markers. In total, taking into account associations representing the same linkage groups, 30 linkage groups were detected on the female side and 28 on the male side. On the female map, 68.3% of the pairwise marker linkages were in coupling versus 31.7% in repulsion phase, and the corresponding figures on the male map were 72.2% and 27.8%, respectively. In addition, both groups linked only in the coupling phase and groups linked in the repulsion phase were characterized. The observations suggest that the meiotic behavior of the F. x ananassa genome is neither fully disomic nor fully polysomic, but rather mixed. The genome may not be as completely diploidized as previously assumed.

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“…Later observations by Staudt (1951Staudt ( , 1952 with the hexaploid species F. moschata and the tetraploid species F. orientalis showed mutlivalent associations present at diakinesis, but their terminalization into bivalents by Metaphase I. Mok and Evans (1971), in an attempt to determine the probability of polysomic inheritance in strawberry cultivars, studied diakinesis of nine eastern North American cultivars. They found multivalent pairing in each of the nine cultivars in each of 2 years, varying from quadrivalents and hexavalents to occasional octovalents.…”

Section: Cytogeneticsmentioning

confidence: 99%

Strawberry Genetics.

Galletta¹,

Maas²

1990

HortSci

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There have been several comprehensive English language historical reviews of strawberry genetics and improvement, notably those of Darrow (1937Darrow ( , 1966 and Scott and Lawrence (1975). Gaining an understanding of strawberry genetics is complicated by varying species ploidy levels, hybrid origin of several of the polyploid species, and a combination of discontinuous (discrete or Mendelian) and continuous (quantitative or multifactorial) inheritance patterns for various traits within the same plant.Genetic exchange within and among species in the genus Fragaria is further limited by sexual dimorphism in some of the species, and by partial or complete cross-incompatibility in both heteroploid and in some homoploid hybridizations. Fortunately, exchange among the octoploid species, including the garden or cultivated strawberry and its ancestral American parent species, is relatively unrestricted.An attempt will be made in this review to outline major trends in strawberry genetics research since the Scott and Lawrence paper, or roughly the period from 1970 to 1989. Cytogenetic, evolutionary, and ecological facets of the strawberry genetics picture will be treated lightly, or not at all, because these topics will be treated by others in this series.

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Chromosome Associations at Diakinesis in the Cultivated Strawberry

Cited by 12 publications

References 7 publications

Comparative Genetic Mapping Between Octoploid and Diploid Fragaria Species Reveals a High Level of Colinearity Between Their Genomes and the Essentially Disomic Behavior of the Cultivated Octoploid Strawberry

Comparative Genetic Mapping Between Octoploid and Diploid Fragaria Species Reveals a High Level of Colinearity Between Their Genomes and the Essentially Disomic Behavior of the Cultivated Octoploid Strawberry

Characterization of mixed disomic and polysomic inheritance in the octoploid strawberry (Fragaria × ananassa) using AFLP mapping

Strawberry Genetics.

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