The occurrence of multiperforate perforation plates in maize root metaxylem

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Abstract
A characteristic feature for both the early and late metaxylem of maize roots fs the occurrence of porous perforation plates. Occasionally but very rarely scalariform perforation, plates are also formed with the less specialized early metaxylem. Of a larger number of representatives analysed the line 4 Y is exceptional, various types of multiperforate plates occurring there more often, even with the late metaxylem. The taxonomical or ecological value of this character is not known.