The inheritance of quantitative traits in Brassica napus ssp. rapifera (swedes): Augmented triple test cross analyses of production characters |
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Authors: | LD Ramsay JE Bradshaw DW Griffiths MJ Kearsey |
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Institution: | (1) Scottish Crop Research Institute, Invergowrie, Dundee, DD2 5DA, U.K.;(2) School of Biological Sciences, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K. |
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Abstract: | Two F2 triple test crosses, augmented with F3s, produced from crosses between different inbred lines of swedes (Brassica napus ssp.rapifera L.) were assessed in field trials at Dundee in 1988 and 1989,respectively. This paper reports the analyses of resistance
to powdery mildew, neck length, growth cracks, sugar content and hardness; analyses of yield have been published previously.
Additive genetical variation was found for all traits while non-additive variation was less important, the highest degree
of dominance being 0.44 for hardness. There was evidence of additive × dominance and dominance × dominance epistasis for mildew
and additive × additive epistasis for neck length and hardness. Significant,consistent reciprocal differences were found and
these were particularly large for neck length and growth cracks. Sugar determination was carried out on the basic generations
of the second cross, the parental lines of which showed large differences in concentration of glucose, fructose and sucrose.
Directional dominance was found for high glucose but not for fructose or sucrose. The implications of these results for swede
breeding are discussed and it is proposed that inbred cultivars would be a more practical option than F1 hybrids.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Brassica napus growth cracks hardness neck length powdery mildew resistance sugars swede triple test cross |
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