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Developmental Cycles in Shoot Growth of Male Cycas circinalis
American Journal of Botany
Vol. 77, No. 8 (Aug., 1990), pp. 981-985
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2444568
Page Count: 5
You can always find the topics here!Topics: Leaves, Plants, Phloem, Diameters, Xylem, Pith, Plant growth, Scars, Gardens, Apical meristems
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Cycles of development in several male shoots of Cycas circinalis were studied by counting sequences of foliage leaves, scale leaves, and cones by observation of either their scar patterns or vascular remains. Although male cones are always produced subsequent to a cycle of foliage leaves and are fairly regularly spaced there is no obvious correlation between their presence and the previous cycles of leaves. Ratios of foliage leaves to scale leaves in each cycle are variable. The primary diameter of the axis is obconical, but a conical stem form results from secondary growth. The result of concentric development of xylem and phloem is positively correlated with stem diameter rather than stem age.
American Journal of Botany © 1990 Botanical Society of America, Inc.