The inheritance of quantitative traits in brassica napus ssp. Rapifera(swedes): augmented triple test cross analysis of yield

ABSTRACT Two augmented triple test crosses were produced from inbred lines of swede (_Brassica napus_ ssp. _rapifera_ L.) and assessed in field trials at Dundee in 1988 and 1989,

respectively. The first cross was between lines derived from cvs. Criffel and Marian and the second between the same Criffel line and one from Bangholm Wilby. The genetic architectures of

the two components of dry weight yield were clearly different. Dry-matter percentage was mainly under the control of additive genetical variation whereas fresh weight yield was under the

control of additive and dominance variation. Although there was unidirectional dominance (positive [_h_]) for high yield, the dominance ratio was less than unity in both crosses. Dry weight

yield was also under the control of genes showing both additive and dominance variation. In both crosses [_h_] was larger than [_d_] and the F1 outyielded the better parent by 14 and 12 per

cent, respectively. The dominance ratio was less than unity, being 0.50 and 0.94 respectively. There was no evidence of overdominance. Whilst epistasis was not a major feature of the genetic

architecture of dry matter yield and its components, there were large and unexpected reciprocal differences, particularly for fresh and dry weight yield in all TTC generations and the F3 of

the first cross. These require further investigation. Finally it was concluded that it should be possible to produce inbred cultivars of swede which outyield F1, hybrids in a modest sized

breeding programme because 12 and 2 per cent, respectively, of the recombinant inbred lines from the two crosses were predicted to outyield the F1. SIMILAR CONTENT BEING VIEWED BY OTHERS THE

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Breeding_. Ph. D. Thesis, University of Birmingham. Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * School of Biological Sciences, The University of

Birmingham, Edgbaston, Birmingham, B15 2TT, UK L D Ramsay & M J Kearsey * Scottish Crop Research Institute, Invergowrie, Dundee, DD2 5DA, UK J E Bradshaw Authors * L D Ramsay View author

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View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Ramsay, L.,

Bradshaw, J. & Kearsey, M. The inheritance of quantitative traits in _Brassica napus_ ssp. _rapifera_(swedes): augmented triple test cross analysis of yield. _Heredity_ 73, 84–91 (1994).

https://doi.org/10.1038/hdy.1994.102 Download citation * Received: 24 January 1994 * Issue Date: 01 July 1994 * DOI: https://doi.org/10.1038/hdy.1994.102 SHARE THIS ARTICLE Anyone you share

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Nature SharedIt content-sharing initiative KEYWORDS * _Brassica napus_ * dry-matter yield * heterosis * swede * triple test cross