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Fig. S1 Modification of long chain bases during de novo synthesis of sphingolipids in plants.

Fig. S2 Programmed cell death promoted by fumonisin B1 (FB1) is already observed at 36 h.

Fig. S3 Accumulation kinetics of the less abundant free long chain bases (LCBs) and phosphorylated LCBs (LCBs-P) in wild type (WT) and lcb2a-1 seedlings exposed to fumonisin B1 (FB1).

Table S1 Accumulation kinetics of free long chain bases and phosphorylated long chain bases in wild-type (WT) and lcb2a-1 mutant seedlings treated or not with fumonisin B1 (FB1)

Methods S1 Plant material and growth conditions, isolation of T-DNA insertion lines and construction of mutant lines, detection of nuclear DNA fragmentation, ultrastructural analysis, protein extraction and kinase assays, and immunoblots of MPK6 and MPK3.

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