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Homoeologous chromatin exchange in a radiation-induced gene transfer



Homoeologous chromatin exchange in a radiation-induced gene transfer



Canadian Journal of Genetics and Cytology 19(1): 125-131



Some of the ionizing-radiation-induced translocations between alien and wheat chromosomes show no deleterious effects and are transmitted normally through the pollen. Translocations of this type are called compensating. In one such compensating translocation, designated T4, a segment of Agropyron elongatum (Host.) P.B. chromosome 7el1 with gene Lr19 controlling resistance to leaf rust was transferred into wheat chromosome 7D. The T4 translocation involved chromosome arms 7el1.alpha. and 7DL. The pairing relationships of Agropyron telosome 7E.alpha. with telosomes 7AL, 7BL, 7DS and 7el1.alpha. was studied in wheat-Aegilops speltoides Tausch. hybrids. The 7E.alpha. telosome paired with 7DS and is homologous with it. It did not pair with 7AL, 7BL, and 7el1.alpha. Hence 7AL, 7BL, .DELTA.L and 7el1.alpha. must be homologous. Chromatin in the long arm of chromosome 7D was replaced with homologous chromatin of the Agropyron chromosome in the T4 translocation.

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Accession: 000396682

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