Sexual hybridisation in crosses of cultivated Brassica species with the crucifers Erucastrum gallicum and Raphanus raphanistrum: Potential for gene introgression |
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Authors: | Eric Lefol Ginette Séguin-Swartz R Keith Downey |
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Institution: | (1) Department of Crop Science and Plant Ecology, University of Saskatchewan, 51 Campus Drive, Saskatoon, Saskatchewan, S7N 5A8, Canada;(2) Agriculture and Agri-Food Canada Research Centre, 107 Science Place, Saskatoon, Saskatchewan, S7N 0X2, Canada |
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Abstract: | Studies were conducted to investigate the crossability of the cultivated Brassica species, Brassica napus (oilseed rape),
B. rapa (turnip rape), and B. juncea (brown and oriental mustard), with two related cruciferous weeds that are abundant in
certain regions of Canada, Erucastrum gallicum (dog mustard) and Raphanus raphanistrum ssp. raphanistrum (wild radish). Seed
was produced without recourse to embryo rescue from all reciprocal crosses except R. raphanistrum × B. juncea. Four hybrid
plants were recovered, namely B. napus × E. gallicum, B. napus × R. raphanistrum (two plants), and B. rapa × E. gallicum.
The hybrids were characterized by their morphology, RAPD analysis, and cytological examination. The B. rapa × E. gallicum
hybrid was extremely vigourous and fertile, and would likely grow in natural habitats. This hybrid produced self-seed and
backcrossed readily with the B. rapa parent and, to a lesser extent, with the E. gallicum parent. The B. napus × E. gallicum
hybrid was a weak plant, but produced fertile backcross progeny with the E. gallicum parent. The B. napus × R. raphanistrum
hybrids were vigourous but mostly sterile. Because of their low vigour and/or sterility, hybrids produced from crosses of
B. napus with the cruciferous weeds would not likely be an environmental concern. However, the potential of the B. napus ×
E. gallicum and B. rapa × E. gallicum hybrids to backcross with E. gallicum may be of concern.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Brassicaceae intergeneric hybridisation RAPDs cruciferous weeds |
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