caa a22 4500 477090214 CHVBK 20180405111514.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF02259709 doi (NATIONALLICENCE)springer-10.1007/BF02259709 The inheritance of B chromosomes in Allium schoenoprasum L [Elektronische Daten] [S. Bougourd, A. Plowman] The inheritance of B chromosomes has been investigated inAllium schoenoprasum from the River Wye, Powys; controlled crosses between plants of known B chromosome constitution were carried out, and the numbers of Bs present in the progenies scored. There was considerable heterogeneity in B chromosome transmission rates across the range of B chromosome numbers, through both the male and female lines, and in crosses involving odd and even numbers of Bs. The mean B number of the progeny was lower than the Mendelian expectation in 41 of the 57 crosses, significantly so in about a third of cases. No progeny had a mean B number significantly higher than expected. The mean transmission rate per B was not significantly different between parents with different numbers of Bs, in either the male of female line, or between plants carrying odd or even numbers of Bs. Transmission through the male line (0.43) was higher than through the female line (0.35), but not significantly so. The overall mean transmission rate per B (0.4), estimated from all crosses, was significantly lower than the expected rate of 0.5. This study provides conclusive evidence that B chromosomes inA. schoenoprasum from the River Wye lack an effective accumulation mechanism and, furthermore, show significant losses during transmission to the progeny of controlled crosses. Rapid Science Publishers, 1996 accumulation mechanisms nationallicence Allium schoenoprasum nationallicence B chromosomes nationallicence B transmission rates nationallicence drive nationallicence Bougourd S. Department of Biology, The University of York, PO Box 373, YO1 15YW, York, UK aut Plowman A. Department of Agricultural and Environmental Science, University of Newcastle upon Tyne, Ridley Building, NE1 7RU, UK aut Chromosome Research Kluwer Academic Publishers 4/2(1996-03-01), 151-158 0967-3849 4:2<151 1996 4 10577 https://doi.org/10.1007/BF02259709 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02259709 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bougourd S. Department of Biology, The University of York, PO Box 373, YO1 15YW, York, UK aut NATIONALLICENCE 700 1- Plowman A. Department of Agricultural and Environmental Science, University of Newcastle upon Tyne, Ridley Building, NE1 7RU, UK aut NATIONALLICENCE 773 0- Chromosome Research Kluwer Academic Publishers 4/2(1996-03-01), 151-158 0967-3849 4:2<151 1996 4 10577 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer