Comparisons of male sterile cytoplasms in canola (Brassica napus L.)

Simple item page
dc.contributor.authorGingera, Gregory Rossen_US
dc.date.accessioned2009-12-03T19:12:48Z
dc.date.available2009-12-03T19:12:48Z
dc.date.issued1991en_US
dc.degree.disciplinePlant Scienceen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractThe effect of several male sterile cytoplasms on intercultivar canola hybrids was assessed over three years (1987-1989). The nuclear genomes of several cultivars and hybrids of canola were transfered to the nap, ogu and pol male sterile cytoplasms. Days to first flower and to days to 50% flower were increased in the pol but not in the ogu cytoplasm. Seed yield and total dry matter were reduced for both open pollinated populations and hybrids in the ogu cytoplasm. Seed yield and total dry matter were significantly lower in pol than in the nap cytoplasm for hybrids and to a lesser degree for the open pollinated populations. Relative seed oil concentration was reduced in the pol cytoplasm by 1.8 and 2.3 percent; in ogu by 1.5 and. 6.1 percent for 1988 and 1989 respectively. Relative seed protein was increased by the pol and ogu cytoplasms by 1.2 and 3.3 percent in both years. The effect of the male sterile cytoplasms on classical growth characters was also assessed in the three years. The ogu cytoplasm had consistently lower crop growth rates, net assimilation rates, relative growth rates and leaf area development than similar treatments in the nap and pol cytoplasms. Genotypes in the pol cytoplasm produced similar growth characters as those in nap, except the former produced a 10 % lower net assimilation rate early in the growing season. Hybrids in the nap cytoplasm produced greater levels of heterosis for leaf area and crop growth rates than the pol cytoplasm. B. napus hybrids were heterotic for leaf area index and leaf area duration but appeared to exhibit little or no heterosis for crop growth rates, net assimilation rates or relative growth rates. Carbon dioxide exchange rates of cultivars and hybrids in the three cytoplasms were determined in 1987, 1988 and 1989. In all three years, there were no significant differences between treatments in the nap and pol cytoplasms. As compared to nap cytoplasm treatments, ogu cytoplasm treatments reduced photosynthetic rates by approximately 20%. Genotypes in the ogu cytoplasm had approximately 65% of the leaf chlorophyll of the nap cytoplasm treatments early in the growing season and approached chlorophyll levels of the nap cytoplasm treatments later in the growing season. There were no significant differences in photosynthetic rate per unit chlorophyll between any of the cytoplasms. In the narrow range of genotypes tested there was no heterosis for photosynthetic rate or leaf chlorophyll content.en_US
dc.format.extentx, 131 leaves :en_US
dc.format.extent5600603 bytes
dc.format.mimetypeapplication/pdf
dc.identifierocm72799702en_US
dc.identifier.urihttp://hdl.handle.net/1993/3595
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.rightsThe reproduction of this thesis has been made available by authority of the copyright owner solely for the purpose of private study and research, and may only be reproduced and copied as permitted by copyright laws or with express written authorization from the copyright owner.en_US
dc.titleComparisons of male sterile cytoplasms in canola (Brassica napus L.)en_US
dc.typemaster thesisen_US
local.subject.manitobayesen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Gingera, Comparisons Of.pdf
Size:
5.34 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
FGS - Electronic Theses and Practica
Manitoba Heritage Theses