Appendix S1 Method for surface extraction and quantification of 1,4-benzoxazin-3-ones using the NanoMate technology.

Figure S1 Structures and full names of 1,4-benzoxazin-3-ones in maize roots.

Figure S2 Induction of 1,4-benzoxazin-3-ones by Diabrotica virgifera and jasmonic acid.

Figure S3 Basal and induced phenolic compounds and proteinase inhibitors in maize roots.

Figure S4 UPLC-TOF-MS profile of maize root exudates.

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