Interchange heterozygotes versus homozygotes

Bailey, R J; Rees, H.; Jones, Laura M.

doi:10.1038/hdy.1976.69

Cited by 20 publications

(10 citation statements)

References 6 publications

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“…There is evidence supporting a superior fitness of interchange heterozygotes in rye (Rees, 1961;Bailey et al, 1976Bailey et al, , 1978. However, since there are many different interchanges in the" Ailés "cultivar other explanations should be also considered.…”

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confidence: 99%

Maintenance of interchange heterozygosity in cultivated rye, Secale cereale L.

Candela

Figueiras

1979

Heredity

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SUMMARYThe maintenance for several generations of interchange heterozygosity in both experimental and cultivated fields of rye is analysed. An experimental analysis of interchange heterozygotes has been carried Out to ascertain whether only one or several translocations exist in the population. Interchange heterozygosity is discussed on the basis of the karyotypic orthoselection model. The maintenance of a constant frequency (20 per cent) of structural heterozygotes for several generations suggests the existence of an equilibrium. The possible mechanisms involved in such an equilibrium are discussed.

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confidence: 99%

Maintenance of interchange heterozygosity in cultivated rye, Secale cereale L.

Candela

Figueiras

1979

Heredity

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“…It has been suggested that translocated segments confer heterosis by providing gene heterozygosity. However, Bailey et al (1976) found that plants with two heterozygous translocations did not respond as well to crowded conditions as did plants with only one of .the translocations. They concluded that the improved fitness was due to the action and interaction of these heterozygous gene combinations rather than to genic heterozygosity per se.…”

Section: Resultsmentioning

confidence: 88%

Cytogenetic studies on a heterozygous reciprocal translocation in the wheat (Triticum aestivum) cultivar Atlas 66

Primard¹,

Morris²,

Papa³

1991

Genome

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PRIMARD, S. J., MORRIS, R., and PAPA, C. M. 1991. Cytogenetic studies on a heterozygous reciprocal translocation in the wheat (Triticum aestivum) cultivar Atlas 66. Genome, 34: 313-316. The wheat ( Triticum aestivum L.) cultivar Atlas 66 possesses a heterozygous reciprocal translocation that has persisted through seven generations of self-pollination and also has appeared in progeny of crosses between cv. Atlas 66 and other wheat cultivars or lines. Crosses were made between cv. Atlas 66 and the 21 cv. Chinese Spring double ditelosomics to identify the chromosomes involved in the translocation. F, plants testing chromosomes 2A and 2D had a chain with one telosome attached and the other unpaired in some metaphase I cells, indicating that 2A and 2D were involved in the translocation. The F,s testing the other 19 chromosomes had a chain of four and a trivalent that included the two telosomes. F, meiotic configurations from crosses between cv. Altas 66 and cv. Chinese Spring ditelosomics 2AS, 2AL, 2DS, and 2DL indicated that the breakpoints were in 2AL and 2DL and that the breakpoint in 2DL was closer to the end of the arm than the breakpoint in 2AL. The short translocated 2DL segment could explain the occurrence of chains as well as rings when cv. Atlas 66 was self-pollinated, and a predominance of chains in crosses with other cultivars or lines. There was evidence for the transmission of duplicate-deficient gametes from the translocation. Key words: heterozygous reciprocal translocation, Triticum aestivum, wheat, cv. Atlas 66. PRIMARD, S. J., MORRIS, R., et PAPA, C. M. 1991. Cytogenetic studies on a heterozygous reciprocal translocation in the wheat (Triticum aestivum) cultivar Atlas 66. Genome, 34 : 3 13-3 16. Le cultivar de ble Atlas 66 (Triticum aestivum L.) possede une translocation heterozygote reciproque qui a persiste a travers sept generations d'autopollinisation et qui s'est maintenue chez les descendants de croisements entre le cv. Altas 66 et 21 des doubles ditelosomiques du cv. Chinese Spring, pour identifier les chromosomes impliques dans la translocation. Les plantes F, testees pour les chromosomes 2A et 2D a la metaphase I possedaient des cellules ayant un chaine de chromosomes avec un telosome attache et une autre chaine non appariee, ce qui indique que les chromosomes 2A et 2D etaient impliques dans la translocation. Les F, ont d'autre part ete testees pour les 19 autres chromosomes; elles avaient des cellules possedant une chaine de quatre chromosomes et un trivalent comportant les deux telosomes. Les configurations meiotiques des F, issues de croisements entre le cv. Atlas 66 et les ditelosomiques de cv. Chinese Spring 2AS, 2AL, 2DS et 2DL ont indique que les fractures etaient localisees dans le 2AL et le 2DL et que, chez les 2DL, la fracture etait situee plus pres de l'extremite du bras que celle du 2AL. Le court segment du 2DL transfere pourrait expliquer l'occurrence de chaines ainsi que d'anneaux lorsque le cv. Atlas 66 est autopollinise et une predominance de chaines dans les croisements ave...

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“…On the other hand, it has been suggested that chromosomal polymorphisms are preserved in a population because of the adaptive superiority of the heterozygotes, this compensating for the sterility (Cleland, 1962;Bailey et al, 1976). This heterotic effect was explained by the heterozygous combinations of gene complexes located on the chromosomes involved in rearrangements.…”

Section: Discussionmentioning

confidence: 99%

Genes for reproductive isolation located on rearranged chromosomes

Sano

Kita

1978

Heredity

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SUMMARYEvidence from an experiment involving interspecific hybrids of Melilotus suggested that several genes causing isolating barriers, such as hybrid breakdown and non-crossability, are located on rearranged segments. In general, reproductive barriers were controlled by complementary or duplicate genes. The fixation of such genes within a population is possibly promoted when they are linked with the breakage points of rearrangements.

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Interchange heterozygotes versus homozygotes

Cited by 20 publications

References 6 publications

Maintenance of interchange heterozygosity in cultivated rye, Secale cereale L.

Maintenance of interchange heterozygosity in cultivated rye, Secale cereale L.

Cytogenetic studies on a heterozygous reciprocal translocation in the wheat (Triticum aestivum) cultivar Atlas 66

Genes for reproductive isolation located on rearranged chromosomes

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