European Journal of Plant Pathology (2016) 144, 133-140

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Juha Kaitera and Johanna Witzell (2016)
Phenolic profiles of two Melampyrum species differing in susceptibility to Cronartium rust
European Journal of Plant Pathology 144 (1), 133-140
Abstract: Cronartium flaccidum is an important pathogen in boreal forestry where it causes pine stem rust. The hemiparasite Melampyrum sylvaticum serves as a telial host for this heteroecious fungus while the congeneric M. pratense is highly resistant. We hypothesized that the variation in susceptibility is due to differences in the composition of secondary phenolic compounds in host plant tissues. To test this hypothesis, phenolic compounds of leaf extracts taken from both species of Melampyrum were analyzed with HPLC. Principal component analysis (PCA) and hierarchical cluster analysis (HCA) were used for data processing. PCA indicated difference between the species, with the first two components explaining more than 70 % of the total variance of data that was separated into two distinct groups in a scatter plot. Two clusters, formed by the two species, were also suggested by HCA. Phenolic acids (such as chlorogenic acid), flavanones and apigenin flavonoids dominated the profiles of rust-resistant M. pratense, while kaempferol and luteolin flavonoids occurred in high relative concentrations in rust-susceptible M. sylvaticum. Our results suggest that phenolics may contribute to resistance or susceptibility of Melampyrum to Cronartium rusts as one factor. Future studies on the mode of action of phenolics in this interaction are thus warranted.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Juha Kaitera

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Cronartium flaccidum Finland