The response of oilseed rape (Brassica napus ssp. oleifera) accessions with different glucosinolate and erucic acid contents to four isolates of Peronospora parasitica (downy mildew) and the identification of new sources of resistance

The oilseed rape crop, Brassica napus L. and B. campestris L., has undergone a significant chemical transformation during the last 15 years. Plant breeders produced cultivars with only trace levels of erucic acid in the oil compared with 40-50% in early cultivars, and with 18 μmol/g of glucosinolates or less in the oil-free meal compared with 62-1 15 μmol/g (Daun 1983). The new “Canola” cultivars were developed because erucic acid was a suspected health hazard for humans and glucosinolates caused the meal to be unpalatable or toxic to farm animals.

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Effect of Growth Temperature on Erucic Acid Levels in Seeds and Microspore-derived Embryos of Oilseed Rape, Brassica napus L.

Journal of Plant Physiology ◽

10.1016/s0176-1617(96)80036-8 ◽

1996 ◽

Vol 147 (5) ◽

pp. 486-492 ◽

Cited By ~ 12

Author(s):

Jeroen A. Wilmer ◽

Johannes P.F.G. Helsper ◽

Linus H.W. van der Plas

Keyword(s):

Brassica Napus ◽

Erucic Acid ◽

Oilseed Rape ◽

Growth Temperature ◽

Brassica Napus L

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Changes in oxylipins in compatible and incompatible interactions between oilseed rape and the downy mildew pathogen Peronospora parasitica

Physiological and Molecular Plant Pathology ◽

10.1016/j.pmpp.2006.02.004 ◽

2005 ◽

Vol 67 (3-5) ◽

pp. 268-273 ◽

Cited By ~ 3

Author(s):

Dale Ronald Walters ◽

Tracy Cowley ◽

Hans Weber ◽

Nash.I. Nashaat

Keyword(s):

Downy Mildew ◽

Oilseed Rape ◽

Peronospora Parasitica ◽

Incompatible Interactions

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Resynthesized lines and cultivars of Brassica napus L. provide sources of resistance to the cabbage stem weevil (Ceutorhynchus pallidactylus (Mrsh.))

Bulletin of Entomological Research ◽

10.1017/s0007485310000489 ◽

2010 ◽

Vol 101 (3) ◽

pp. 287-294 ◽

Cited By ~ 11

Author(s):

M. Eickermann ◽

B. Ulber ◽

S. Vidal

Keyword(s):

Brassica Napus ◽

Field Experiment ◽

Oilseed Rape ◽

Screening Tests ◽

Host Quality ◽

Sources Of Resistance ◽

Brassica Napus L ◽

Key Factor ◽

Ceutorhynchus Pallidactylus

AbstractThe cabbage stem weevil (Ceutorhynchus pallidactylus (Mrsh.)) (Col., Curculionidae) is a serious pest of winter oilseed rape (Brassica napus L. var. oleifera Metzg.) in central and northern Europe. Although host-plant resistance is a key tool in integrated pest management systems, resistant genotypes are not yet available for this species. Resynthesized rapeseed lines (B. oleracea L.×B. rapa L.) are broadening the genetic diversity and might have potential as sources of resistance to pest insects. The host quality, of nine resynthesized rapeseed lines and six genotypes of B. napus to cabbage stem weevil, was evaluated in laboratory screening tests and in a semi-field experiment. In dual-choice oviposition tests, female C. pallidactylus laid significantly fewer eggs on five resyntheses and on swede cv ‘Devon Champion’ than on the moderately susceptible oilseed rape cv ‘Express’, indicating a lower host quality of these genotypes. Results of laboratory screenings were confirmed in a semi-field experiment, in which twelve genotypes were exposed to C. pallidactylus females. The number of larvae was significantly lower in two resyntheses and in cv ‘Devon Champion’ than in oilseed rape cv WVB 9. The total, as well as individual, glucosinolate (GSL) content in the leaves differed substantially among the genotypes tested. The amount of feeding by larvae of C. pallidactylus, as measured by a stem-injury coefficient, was positively correlated with the indolyl GSL compounds 3-indolylmethyl and 4-methoxy-3-indolylmethyl, and with the aromatic GSL 2-phenylethyl, whereas it was negatively correlated with 4-hydroxy-3-indolylmethyl. Thus, the composition and concentration of GSL compounds within the plant tissue might be a key factor in breeding for pest resistance in oilseed rape.

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