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

It appears your Web browser is not configured to display PDF files. Download adobe Acrobat or click here to download the PDF file.

Click here to download the PDF file.

Creator: 

Kesidis, Cleoniki Elizabeth

Date: 

2019

Abstract: 

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.

Subject: 

Botany
Plant Culture

Language: 

English

Publisher: 

Carleton University

Thesis Degree Name: 

Master of Science: 
M.Sc.

Thesis Degree Level: 

Master's

Thesis Degree Discipline: 

Biology

Parent Collection: 

Theses and Dissertations

Items in CURVE are protected by copyright, with all rights reserved, unless otherwise indicated. They are made available with permission from the author(s).