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Resistance to cabbage seedpod weevil among selected Brassicaceae germplasm

Published online by Cambridge University Press:  02 April 2012

H. Cárcamo ,
O. Olfert ,
L. Dosdall ,
C. Herle ,
B. Beres  and
J. Soroka
H. Cárcamo*
Affiliation:
Agriculture and Agri-Food Canada, Lethbridge Research Centre, 5403 1st Avenue S, Lethbridge, Alberta, Canada T1J 4B1
O. Olfert
Affiliation:
Agriculture and Agri-Food Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, Saskatchewan, Canada S7N 0X2
L. Dosdall
Affiliation:
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5
C. Herle
Affiliation:
Agriculture and Agri-Food Canada, Lethbridge Research Centre, 5403 1st Avenue S, Lethbridge, Alberta, Canada T1J 4B1
B. Beres
Affiliation:
Agriculture and Agri-Food Canada, Lethbridge Research Centre, 5403 1st Avenue S, Lethbridge, Alberta, Canada T1J 4B1
J. Soroka
Affiliation:
Agriculture and Agri-Food Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, Saskatchewan, Canada S7N 0X2
*
1Corresponding author (e-mail: carcamoh@agr.gc.ca).
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Abstract

Brassicaceae germplasm (Brassica napus L., Brassica rapa L., Brassica juncea (L.) Czern., Brassica carinata A. Braun, Sinapis alba L., Camelina sativa (L.) Crantz, Crambe species) with cultivar development potential for the prairies was evaluated for resistance to cabbage seedpod weevil (Ceutorhynchus obstrictus (Marsham) (Coleoptera: Curculionidae)) infestation under field conditions in southern Alberta from 2001 to 2005. Relative susceptibilities were as follows: B. rapa and B. napus > B. juncea = B. carinata > S. alba. Although some of the germplasm evaluated varied within species in terms of glucosinolate profile, erucic acid level, oil content, and plant height, none of these factors appeared to influence the degree of C. obstrictus damage. A subset of this germplasm was also evaluated in the greenhouse. Although the canola species B. rapa sustained the highest level of damage in the field tests, it was similar to other Brassica genotypes in the greenhouse. All lines of S. alba were virtually immune to weevil attack in both field and greenhouse tests, regardless of glucosinolate profile, suggesting that other factors confer resistance in this species. Synchrony of crop development with weevil activity in the field explains some of the variability in damage observed among genotypes and illustrates the importance of combining field and greenhouse studies when assessing resistance.

Résumé

Nous avons évalué dans des champs cultivés du sud de l'Alberta de 2001 à 2005 la résistance du germoplasme des Brassiceae (Brassica napus L., Brassica rapa L., Brassica juncea (L.) Czern., Brassica carinata A. Braun, Sinapis alba L., Camelina sativa (L.) Crantz et Crambe spp.) qui présentent un intérêt pour la formation de cultivars pour les Prairies résistants à l'infestation par le charançon de la silique du chou (Ceutorhynchus obstrictus (Marsham)(Coleoptera: Curculionidae)). Les vulnérabilités relatives sont dans l'ordre suivant: B. rapa et B. napus > B. juncea = B. carinata > S. alba. Bien qu'une partie du germoplasme varie au sein d'une même espèce en ce qui a trait au profil glucosinolate, à la concentration d'acide érucique, au contenu en huile et à la taille des plants, aucun de ces facteurs ne semble affecter les dommages causés par le charançon de la silique du chou. Nous avons aussi évalué un sous-ensemble de ce germoplasme en serre. Bien que l'espèce de canola, B. rapa, subisse le plus fort dommage dans les essais dans les champs, il est semblable aux autres génotypes en serre. Toutes les lignées de S. alba sont pratiquement à l'abri des attaques du charançon, quel que soit leur profil glucosinolate, ce qui indique que ce sont d'autres facteurs qui expliquent la résistance chez cette espèce. Le synchronisme du développement de la culture et de l'activité du charançon dans les champs explique une partie de la variabilité des dommages observés chez les divers génotypes. Ces résultats montrent l'importance de combiner des études dans les champs et les serres lorsqu'on évalue la résistance.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 139 , Issue 5 , October 2007 , pp. 658 - 669
Copyright
Copyright © Entomological Society of Canada 2007

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