Autotriploid and Autotetraploid Cytogenetic Analyses: Correction Coefficients for Proposed Binomial Models

Jackson, R. C.; Hauber, Donald P.

doi:10.2307/2443076

Cited by 25 publications

(33 citation statements)

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“…Therefore observed chiasmata distributions do not deviate from non-random expectations and are consistent with Jackson & Hauber's (1982) model. This assigns an obligate minimum of one chiasma and a maximum of two chiasmata per bivalent (or bivalent-equivalent), operating at low to moderate chiasma frequency per microsporocyte.…”

Section: Chromosome Pairingsupporting

confidence: 80%

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Chromosome studies in someActinidiataxa and implications for breeding

McNeilage

Considine

1989

New Zealand Journal of Botany

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Microsporogenesis was studiedin eleven Actinidia taxa including A. deliciosa (kiwifruit) and in an interspecific hybrid. From chromosome counts at meiotic metaphase 1 or diakinesis, eight taxa were classified as diploids and two as tetraploids and A. deliciosa was confirmed as hexaploid. A putative 2n = 2x, 2n = 4x, 2n = 6x, x = 29 basis for the genus is therefore supported. Chromosomes in all taxa were very small. Three diploids and two polyploids analysed for meiotic pairing behaviour were all characterised by low chiasma frequencies per bivalent. Chromosome configurations other than bivalents were rare in A. arguta var. arguta (4x) and A. deliciosa (6x), indicating there may be genetic control ofchiasmata distribution in these polyploids.

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Section: Chromosome Pairingsupporting

confidence: 80%

“…Equations for deriving the expected frequencies are based on non-random distribution of chiasmata, which is the norm for meiotic systems (Jackson 1982). For diploids, equations given by Jackson & Hauber (1982) were used. In normal diploids, bivalents are either unichiasmate or bichiasmate.…”

Section: Chromosome Pairingmentioning

confidence: 99%

Chromosome studies in someActinidiataxa and implications for breeding

McNeilage

Considine

1989

New Zealand Journal of Botany

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“…Cytological observations of tetraploids of both varieties have revealed the occurrence of quadrivalents at diakinesis and the first metaphase of meiosis, as well as reduced pollen fertility (Raman & Kesavan, 1964;Arbo & Fernandez, 1983;Fernandez, 1987;Shore, 1991). Finally, frequencies of meiotic configurations fit the autotetraploid pairing models of Jackson & Hauber (1982) for four of six populations investigated (Shore, 1991).…”

Section: Introductionmentioning

confidence: 83%

Tetrasomic inheritance and isozyme variation in Turnera ulmifolia vars. elegans Urb. and intermedia Urb. (Turneraceae)

Shore

1991

Heredity

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Tetrasomic inheritance of three isozyme loci is demonstrated in Turnera ulmifolia vars. elegans and intermedia. The data support the occurrence of an autopolyploid origin for tetraploids of both taxonomic varieties. The extent of isozyme variation at 14 loci was determined for diploid and tetraploid populations. Tetraploid Turnera ulmifolia var. intermedia showed the lowest levels of isozyme variation, perhaps a result of founder effect, upon island colonization. In contrast, Turnera ulmifolia var. elegans showed the greatest levels of isozyme variation, suggesting that hybridization among locally differentiated diploid or tetraploid populations might have occurred. The number of independent origins of autotetraploidy in Turnera ulmifolia is unknown.

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“…In tetraploids, however, due to the more complex nature of segregation possible with four gene copies per individual, segregation of S-genotypes could be performed independently, but grouping of phenotypes could not be completely assessed without considering genotype information. Multiple complex models of allelic segregation in tetraploids are possible (eg Jackson and Hauber, 1982;Wu et al, 2001), but for simplicity only the two most extreme models were considered here: (1) tetrasomic inheritance, which results when there is completely independent segregation of each allele (expected to be more common in autotetraploids); and (2) disomic inheritance, which results when parental alleles tend to segregate together so that inheritance is effectively diploid (expected to be more common in allotetraploids). Fit of these models to the expected genotype and phenotype classes was evaluated using w 2 with degrees of freedom equal to nÀ1, where n is the number of expected genotype classes.…”

Section: Segregation Analysesmentioning

confidence: 99%

Inheritance and dominance of self-incompatibility alleles in polyploid Arabidopsis lyrata

2004

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Natural populations of diploid Arabidopsis lyrata exhibit the sporophytic type of self-incompatibility system characteristic of Brassicaceae, in which complicated dominance interactions among alleles in the diploid parent determine selfrecognition phenotypes of both pollen and stigma. The purpose of this study was to investigate how polyploidy affects this already complex system. One tetraploid population (Arabidopsis lyrata ssp kawasakiana from Japan) showed complete self-compatibility and produced viable selfed progeny for at least three generations subsequent to field collection. In contrast, individuals from a second tetraploid population (A. lyrata ssp petraea from Austria) were strongly self-incompatible (SI). Segregation of SI genotypes in this population followed Mendelian patterns based on a tetrasomic model of inheritance, with two to four alleles per individual, independent segregation of alleles, and little evidence of dosage effects of alleles found in multiple copies. Similar to results from diploids, anomalous compatibility patterns involving particular combinations of individuals occurred at a low frequency in the tetraploids, suggesting altered dominance in certain genetic backgrounds that could be due to the influence of a modifier locus. Overall, dominance relationships among S-alleles in self-incompatible tetraploid families were remarkably similar to those in related diploids, suggesting that this very important and complicated locus has not undergone extensive modification subsequent to polyploidization.

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Autotriploid and Autotetraploid Cytogenetic Analyses: Correction Coefficients for Proposed Binomial Models

Cited by 25 publications

References 0 publications

Chromosome studies in someActinidiataxa and implications for breeding

Chromosome studies in someActinidiataxa and implications for breeding

Tetrasomic inheritance and isozyme variation in Turnera ulmifolia vars. elegans Urb. and intermedia Urb. (Turneraceae)

Inheritance and dominance of self-incompatibility alleles in polyploid Arabidopsis lyrata

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