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Origin and Activity of Successive Cambia in Cycas (Cycadales)
American Journal of Botany
Vol. 78, No. 10 (Oct., 1991), pp. 1335-1344
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2445272
Page Count: 10
You can always find the topics here!Topics: Cylinders, Phloem, Tracheids, Xylem, Pith, Cambium, Parenchyma, Botany, Plant cells, Vascular tissues
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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.
American Journal of Botany © 1991 Botanical Society of America, Inc.