The effect of formation pathway on allopolyploids between Brassica carinata, Brassica napus, Brassica juncea and Sinapis arvensis

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  • Polyploidization has played a key role in the evolution of plant lineages. The effect of formation pathway on neopolyploid morphology and fertility, however, is unknown. This thesis compares one-step and two-step allopolyploids with Brassica carinata, Brassica juncea or Brassica napus as the maternal parent and Sinapis arvensis as the paternal parent. One-step allopolyploids formed twice as frequently, though once a homoploid hybrid formed two-step allopolyploids were ten times as frequent as one-step allopolyploids. The two-step allopolyploids were more fertile and more reproductively isolated from parental species. The two types of allopolyploids differed morphologically, but in both types, polyploidy had a large initial effect on morphology while the effect of hybridity endured. Both types of allopolyploids, but especially the one-step allopolyploids, showed an unexpectedly high rate of DNA downsizing. In conclusion, allopolyploids formed through different formation pathways differ significantly in fertility, morphology, and genome stability.

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  • Copyright © 2019 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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  • 2019


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