2001 Volume 65 Issue 8 Pages 1883-1885
A chitinase activity was detected in fractions of xylem sap collected from the cut surface of cucumber stems. A 28-kDa acidic protein was purified from the active fractions and its N-terminal amino acids sequence was found to be identical to that of a chitinase gene. Cucumber roots produce and secrete an acidic chitinase, one of the PR proteins, into xylem sap and deliver it to aboveground organs.
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