Untersuchungen in vitro zur sexuellen kompatibilitat und zur vererbung der pathogenitat von leptosphaeria maculans ((des.) Ces. et de Not.), dem Erreger der stengelgrundfaule der brassicaceae

Translated title of the contribution: In vitro investigations on sexual compatibility and the heritability of pathogenicity of leptosphaeria maculans ((Des.) Ces. et de Not.), the Causal agent of blackleg disease of brassicaceae

Roxana Djalali Farahani, V. Zinkernagel

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Abstract

To investigate the sexual compatibility between different strains of Leptosphaeria maculans matings have been made on a medium mixed with autoclaved stubbles of oilseed rape. Former investigations concerning growth type, growth rate, and length of germ tubes, as well as pigment production and the pathogenicity of isolates on cotyledones, have shown that the strains can be divided into two groups, A and B. According to thepathogenicity of the isolates it was found that in each group, A and B, both aggressive and non-aggressive isolates exist. Intensive mating tests showed, that no sexual compatibility exists between isolates from group A and B. However, it was possible to produce mature pseudothecia between mating-types within each group, irrespective of virulence and host plant. Pseudothecia, deriving from mating types of group A were clearly different from those originating from group B. To test the heritability of virulence, matings have been made between solely aggressive, aggressive and non-aggressive, and between solely non-aggressive mating types within each group. Descendants originating from an exclusively aggressive or from an aggressive/non-aggressive mating splitted irrespective to their belonging to the group of aggressive and non-aggressive isolates. Those who descended from non-aggressive parents were all non-aggressive.

Translated title of the contributionIn vitro investigations on sexual compatibility and the heritability of pathogenicity of leptosphaeria maculans ((Des.) Ces. et de Not.), the Causal agent of blackleg disease of brassicaceae
Original languageGerman
Pages (from-to)249-254
Number of pages6
JournalGartenbauwissenschaft
Volume62
Issue number6
StatePublished - 1997

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