B-chromosomes in inbred lines of rye (Secale cereale L.) |
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Authors: | M. Ortiz M. J. Puertas M. M. Jiménez F. Romera R. N. Jones |
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Affiliation: | (1) Departmento de Genética, Facultad de Biología, Universidad Complutense, 28040 Madrid, Spain;(2) Institute of Biological Sciences, University of Wales Aberystwyth, Sir George Stapledon Building, SY23 3DD Aberystwyth, UK |
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Abstract: | B chromosomes from an experimental population of the Japanese JNK strain of rye, isogenic for its Bs, have been backcrossed into twelve different inbred lines. The experiment is a way of studying the effects of the Bs against a range of different homozygous A chromosome backgrounds. This publication deals with pairing effects of both the As and the Bs, and their interactions, and with pollen mitosis. At meiosis there is a genotypic component to B effects, and they do not appear to act solely through a physical disturbance within the nucleus. In pollen the Bs are always present in more than 50% of the grains regardless of their pairing behaviour during meiosis; this result fits with a parasitic model of the activity of rye Bs. |
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Keywords: | Secale cereale rye B chromosomes inbred lines pairing pollen mitosis transmission genotypes |
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