University of Hertfordshire

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Original languageEnglish
Pages (from-to)98-107
Number of pages10
JournalMolecular Plant-Microbe Interactions
Early online date20 Nov 2019
Publication statusE-pub ahead of print - 20 Nov 2019


Phoma stem canker (blackleg) is one of the most important diseases of winter oilseed rape (Brassica napus) world-wide and is caused by a complex that comprises at least two species: Leptosphaeria maculans and Leptosphaeria biglobosa. Screening a panel of field Leptosphaeria isolates from B. napus for the presence of mycoviruses revealed the presence of a novel dsRNA quadrivirus in L. biglobosa and no viruses in L. maculans. Following elimination of the mycovirus, virus-infected and virus-free isogenic lines of L. biglobosa were created. A direct comparison of the growth and virulence of these isogenic lines illustrated that virus infection caused hypervirulence and resulted in induced systemic resistance towards L. maculans in B. napus following lower leaf pre-inoculation with the virus-infected isolate. Analysis of the plant transcriptome suggests that the presence of the virus leads to subtle alterations in metabolism and plant defences. For instance, transcripts involved in carbohydrate and amino acid metabolism are enriched in plants treated with the virus-infected isolate, while pathogenesis-related proteins, chitinases and WRKY transcription factors are differentially expressed. These results illustrate the potential for deliberate inoculation of plants with hypervirulent L. biglobosa to decrease the severity of phoma stem canker later in the growing season.


© 2020 The Author(s). This is an open access article distributed under the CC BY 4.0 International license.

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