Compartmentalization of American Elm Tissues Infected byCeratocystis ulmi

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Abstract
American elm trees compartmentalized tissues infected by C. ulmi where the cambium was not killed. After infection, the cambium that was not killed formed a barrier zone that separated infected xylem from newly developing healthy xylem. The barrier zones in the sections studied were tangential sheets of axial parenchyma bridging swollen ray parenchyma cells. Recovery of an elm tree after infection may depend on its ability to compartmentalize infected wood to small volumes rapidly and to generate new healthy tissues.

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