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Fusarium graminearum  (Fg) is an important fungal pathogen of small grain cereals that can also infect  Arabidopsis thaliana . In  Arabidopsis , jasmonic acid (JA) signalling involving JASMONATE RESISTANT 1 (JAR1), which synthesizes JA‐isoleucine, a signalling form of JA, promotes susceptibility to Fg. Here we show that  Arabidopsis MYZUS PERSICAE‐INDUCED LIPASE 1  ( MPL1 ), via its influence on limiting JA accumulation, restricts Fg infection.  MPL1  expression was up‐regulated in response to Fg infection, and  MPL1 ‐OE plants, which overexpress  MPL1 , exhibited enhanced resistance against Fg. In comparison, disease severity was higher on the  mpl1  mutant than the wild type. JA content was lower in  MPL1 ‐OE and higher in  mpl1  than in the wild type, indicating that  MPL1  limits JA accumulation. Pharmacological experiments confirmed the importance of  MPL1 ‐determined restriction of JA accumulation on curtailment of Fg infection. Methyl‐JA application attenuated the  MPL1 ‐OE‐conferred resistance, while the JA biosynthesis inhibitor ibuprofen enhanced resistance in  mpl1 . Also, the JA biosynthesis‐defective  opr3  mutant was epistatic to  mpl1 , resulting in enhanced resistance in  mpl1 opr3  plants. In comparison,  JAR1  was not essential for the  mpl1 ‐conferred susceptibility to Fg. Considering that methyl‐JA promotes Fg growth in culture, we suggest that in part  MPL1  curtails disease by limiting the availability of a plant‐derived Fg growth‐promoting factor.

molecular plant pathology

Opposing effects of  MYZUS PERSICAE‐INDUCED LIPASE 1  and jasmonic acid influence the outcome of  Arabidopsis thaliana–Fusarium graminearum  interaction