| Autor: |
Bousset, L., Ermel, M., Delourme, R. |
| Zdroj: |
European Journal of Plant Pathology; Nov2020, Vol. 158 Issue 3, p799-803, 5p |
| Abstrakt: |
Breeding varieties for increased disease resistance is a major means to control epidemics. However, the deployment of resistance genes through space and time drives the genetic composition of the pathogen population, directionally altering pathotype frequencies. In France, Leptosphaeria maculans causes stem canker on Brassica napus oilseed rape crops but not on B. juncea condiment mustard. Prior to the deployment of winter B. napus varieties with Rlm6 resistance gene introduced from B. juncea, the aim of our study was to investigate if this deployment could impact disease control in condiment mustard. We assessed the presence of resistance genes against the disease in a set of current French B. juncea varieties and breeding lines with a set of five differential L. maculans isolates carrying know Avr/avr genes. Rlm6 was detected in all 12 condiment mustard varieties. Rlm5 was also detected in eight varieties. No additional resistance genes were detected with the set of isolates used. Because the frequency of isolates virulent on Rlm6 is very low in France, these results indicate that Rlm6 gene is a major component of disease control in the French B. juncea mustards tested. Using Rlm6 in oilseed rape varieties will very likely induce an increase in frequency of Rlm6 virulent isolates. This raises the acute concern of a wise deployment of oilseed rape around the condiment mustard growing area. Scientific knowledge on adaptation dynamics, spatial segregation of crops and cooperation between actors is currently available in order to mitigate the risk and advert negative consequences of the introduction of Rlm6 resistance gene in oilseed rape varieties. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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