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Circadian rhythms used in mildew defence

Researchers from the US Duke University (Durham, North Carolina) have found that defence mechanisms used by thale cress ( Arabidopsis thaliana) against its obligate and exclusive downy mildew pathogen, Hyaloperonospora arabidopsis (Hpa), cycle on a daily basis. The plant’s defences are at their most effective early in the morning, when infectious spores are released by the pathogen.



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