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Xylem Derived from the Intercalary Meristem of Cyperus alternifolius
Jack B. Fisher
Bulletin of the Torrey Botanical Club
Vol. 97, No. 1 (Jan. - Feb., 1970), pp. 58-66
Published by: Torrey Botanical Society
Stable URL: http://www.jstor.org/stable/2483991
Page Count: 9
You can always find the topics here!Topics: Internodes, Xylem, Pitting, Plant growth, Diameters, Human organs, Parenchyma, Rhizomes, Plant names, Meristems
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The presense of one long-lived intercalary meristem (IM) which produces an elongated internode makes this plant ideally suited for developmental studies related to an IM. Three types of vascular bundles are present in the internode and are followed in development from the basal IM. The vasculature of the growing internode is explained in terms of a continuous system with protoxylem passing through the IM which is connected to a discontinuous system above the IM. The presence and types of protoxylem vessel members and tracheids are described. Early and late metaxylem were studied by random sampling technique. Both differ in frequency of types and orientations of perforation plates. The length of both types of elements decreases toward the base of the internode while the diameter increases. The average vessel length is 11.95 elements for late and 3.44 for early metaxylem. Of early elements, 26.4% are tracheids, while no tracheids are found in late metaxylem. Transitional elements which occur in the region of the matured IM are interpreted as supporting the view that xylem wall pattern is directly related to the degree of organ elongation.
Bulletin of the Torrey Botanical Club © 1970 Torrey Botanical Society