Characterization of the maize xylem sap proteome

Sophie Alvarez, Jason Q.D. Goodger, Ellen L. Marsh, Sixue Chen, Victor S. Asirvatham, Daniel P. Schachtman

Research output: Contribution to journalArticlepeer-review

92 Scopus citations


The xylem in plants has mainly been described as a conduit for water and minerals, but emerging evidence also indicates that the xylem contains protein. To study the proteins in xylem sap, we characterized the identity and composition of the maize xylem sap proteome. The composition of the xylem sap proteome in maize revealed proteins related to different phases of xylem differentiation including cell wall metabolism, secondary cell wall synthesis, and programmed cell death. Many proteins were found to be present as multiple isoforms and some of these isoforms are glycosylated. Proteins involved in defense mechanisms were also present in xylem sap and the sap proteins were shown to have antifungal activity in bioassays.

Original languageEnglish (US)
Pages (from-to)963-972
Number of pages10
JournalJournal of proteome research
Issue number4
StatePublished - Apr 2006
Externally publishedYes


  • Antifungal activity
  • Corn
  • Glycoprotein
  • Isoform
  • Maize
  • Plants
  • Proteome
  • Xylem sap

ASJC Scopus subject areas

  • Biochemistry
  • Chemistry(all)


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