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Journal Article

Origin and Activity of Successive Cambia in Cycas (Cycadales)

Teresa Terrazas
American Journal of Botany
Vol. 78, No. 10 (Oct., 1991), pp. 1335-1344
Stable URL: http://www.jstor.org/stable/2445272
Page Count: 10

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Topics: Cylinders, Phloem, Tracheids, Xylem, Pith, Cambium, Parenchyma, Botany, Plant cells, Vascular tissues
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Origin and Activity of Successive Cambia in Cycas (Cycadales)
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Abstract

Observations of the vascular tissue of Cycas shoots have provided supporting evidence that the first vascular cambium as well as subsequent successive cambia are simultaneously active. The establishment of the second cambium occurs during the seedling stage, and differentiates mainly within the cortical cells. However, cambial activity also occurs within phloem parenchyma cells of the first vascular cylinder. Tracheids in the first and the successive vascular cylinders are generally of the same length; however, there is a trend toward increasing length within the successive cylinders, possibly because the successive cambia are long-lived.

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