By Muhammad Iqbal
The examine of plant development tactics, as soon as the unique province of anatomists, has develop into multi-disciplinary, with significant contributions being made via biochemists, ecophysiologists, and molecular biologists. This evaluation of traits within the box comprises papers from experts in all the disciplines.
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Fineran, A. K. M. Ghouse, P. G. Mahlberg, H. L. Mogensen, Academic Press, the University of Chicago Press, Springer-Verlag, the American Journal of Botany, and the Bulletin of the Torrey Botanical Club for their generous permission to reproduce published material. I was delighted to work with the editors at Dioscorides Press, who kept me enthusiastically engaged with this project through their expert advice and encouraging treatment throughout the preparation of the book. I have the great pleasure of dedicating this work to commemorate the scientific contributions of Professor A.
Simultaneous with the initiation of a primordium, the groups of cells that ultimately become node and internode are also specified; so is the potential site for bud formation, the leaf axil. The morphological definition of node, internode, and axil is partly due to their topological relationship to the adjacent leaf primordium. Only when the meristem region below the apical dome has produced a sufficient number of cells, however, can node and internode begin to be differentiated. Thus, the plastochron has a greater significance than merely defining the rate of leaf production; it also defines the rate of metamer production by the apex.
The cytological definition, as opposed to the positional definition, of prospective node and internode has largely gone unnoticed, even though cells within the nodal region must eventually be distinguishable from those in the internode on account of the different amounts of growth that each will eventually undergoat least in modules in which the internodes do not remain compressed (as in shoots with a rosette of leaves). A remarkable set of observations on young shoots of Sambucus racemosa (with opposite and decussate phyllotaxy) by Zobel (1985a, b) has demonstrated that cells in the two zones of node and internode differ not only biochemically but also in their relative amounts of growth.