Rapeseed

About: Rapeseed is a research topic. Over the lifetime, 2945 publications have been published within this topic receiving 51790 citations. The topic is also known as: Brassica napus & rape.

Development of a SCAR Marker to Track Canola Resistance Against Blackleg Caused by Leptosphaeria maculans Pathogenicity Group 3

Abstract: Blackleg of rapeseed and canola (Brassica napus) is caused by various pathogenicity groups (PG) of Leptosphaeria maculans. The disease occurring in the Canadian prairies for the last two decades was caused by PG2 and was controlled by host resistance. PG3 and PG4 isolates have been found recently in Canada, but there is no resistance available against these pathogenicity groups in commercial Canadian varieties. This study sought to identify canola cultivars that could be used as sources of resistance to PG3 and to develop molecular markers for marker-assisted selection. Resistance to PG3 specifically was found in B. napus 'Dunkeld' and 'Quinta', while B. juncea 'Cutlass' and 'Domo' proved to be resistant to PG2, PG3, and PG4. A set of F2 progeny of 'Westar' (susceptible) × 'Dunkeld' was used to identify genetic markers linked to PG3 resistance. These markers were physically located on a BAC clone from B. rapa subsp. pekinensis containing a homolog to a serine threonine 20 (ste20)-like kinase in Arabidopsis thaliana. Thus, we have developed a sequence characterized amplified region (SCAR) marker available for marker-assisted selection in breeding canola for resistance against blackleg caused by L. maculans PG3. This work has received a provisional patent (serial # 60/977,933 - Oct. 5, 2007).

Study of Drought Stress and Plant Growth Promoting Rhizobacteria (PGPR) on Yield, Yield Components and Seed Oil Content of Different Cultivars and Species of Brassica Oilseed Rape

Abstract: Rapeseed is a new oilseed crop in Iran and its hectares has been currently expanding. Reproductive growth of the crop is exposed to water stress in many part of the country. In order to evaluation of yield, yield component and seed oil content of Brassica oilseed rape cultivars belong to Brassica napus, Brassica rapa and Brassica juncea species at stress and non stress locations with application of Pseudomonas strains , two experiment ( including stress and non stress fields) were carried out on 2010-2011 growing season at Agriculture and Natural Resources Research Station of Torogh, Mashhad. Experimental design was factorial based on Randomized Competently Block Design (RCBD) . Results showed that drought stress caused to reduction of yield , oil content and yield components. Also the negative forceful effect of water deficit on yield components was regarding pod numbers. Violently final yield decreased( 152.5% ) in stress location. There were considerable difference between stress and non stress locations regarding yield, oil content and all yield components. Except number of lateral branches , significant difference at 1% probability level were found among cultivars in studied characteristics .It was concluded that inoculation treatment had better effects than either no inoculation (control) or co-inoculation but interestingly co-inoculation with Pseudomonas flourescens plus Pseudomonas putida was placed at the lowest rating in comparison with individual inoculation or no inculcation at surveyed traits.

Component fatty acids of rapeseed oil

Abstract: The fatty acid composition of the oil from Argentine rapeseed grown in Western Canada was investigated by converting the glyceride esters to methyl esters and distilling the latter in a Podbielniak Heligrid distillation column. Analyses of the fractions showed 6 to 10% more eicosenoic acid and 7 to 10% less erucic acid than was previously reported for rapeseed oils.

Effects of drought simulated by PEG-6000 on germination and seedling growth of rapeseed (Brassica napus L.)

Abstract: The effects of drought stress simulated by 10% polyethylene glycol 6000(PEG-6000) on physiological and biochemical traits of 14 rapeseed varieties(Brassica napus L.) were studied during germination stage.The results showed that the relative vigor index of seedlings varied between 0.32~0.79,with an average of 0.49.Drought stress affected significantly(P0.01) seedling height,fresh weightand survival rate.Compared with water control,10% PEG-6000 treatment reduced seedling height by 40.68%,fresh weight by 34.2% and survival rate by 18% on average.Also,malomdiadehyde(MDA),soluble sugar,proline,soluble protein content,and electrical conductivity of seedlings increased significantly.Compared with water control,10% PEG-6000 treatment increased the content of MDA by 96.7%,soluble sugar by 75.0%,proline by 2 204.9%,soluble protein by 56.2% and electrical conductivity by 34.8% on average.There were not significant differences between PEG treatment and control on numbers of adventitious roots and length of taproot.The results indicated that the relative vigor index could be used as the main index of drought tolerance in rapeseed during germination stage.