By R. L. Peterson, Carol A. Peterson (auth.), Michael B. Jackson (eds.)

The formation of roots is in a few respects one of many least essentially understood of all plant features. Propagation via cuttings is the element that would happen first to so much gardeners and horticulturists, and it truly is definitely the main helpful program. yet any observant traveler within the tropics can become aware of that a few timber have the behavior of forming roots within the air. Climbers like Cissus undergo lengthy positive strings of roots placing down. Pandanus timber are inclined to have stout aerial roots issuing from the bases of the lengthy branches, whereas the tangle of roots round the trunk of some of the Ficus species is attribute. In Ficus bengalensis, specifically, stout cylindrical roots firmly embedded within the flooring from a top of three to five meters provide help to the lengthy horizontal branches, permitting them to unfold nonetheless extra. within the colossal outdated specimen at Adyar close to Madras, the unfold of those branches all over the tree, each one with a robust root starting to be out each few meters, makes a shaded zone below which conferences of just about 5000 individuals are occasionally held. The background of ways the formation of roots on stem cuttings used to be chanced on to be below hormonal keep watch over is worthy repeating here.

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Zeitschrift fur Botaniche, 1, 253-283. Fahn, A. (1967) Plant Anatomy. Pergamon Press, Toronto. Fourcroy, M. (1942) Perturbations anatomiques interessant Ie faisceau de la racine au voisinage des radicelles. Annales des Sciences Naturelles Botanique, 3, 177-198. G. (1951) Cambial formation in isolated pea roots following decapitation. American Journal of Botany, 38, 596-604. S. (1977) Transfer cells and their roles in transport of solutes in plants. Scientific Progress Oxford, 64, 539-568. L. (1975) The initiation and development of root buds.

X 120. extending into the soil beyond the root surface, and a Hartig net of intercellular hyphae in the cortex of the root in gymnosperms (Fig. 4b) or between epidermal cells only in many angiosperms. The gymnosperm Pinus probably shows the most pronounced structural changes in roots which become mycorrhizal. e. bearing a population of long and short roots [58, 97]. These root types are distinguishable structurally in the primordium stage but subsequent 25 conversion of one type to the other may occur [98, 99].

93. Ginzburg, C. (1966) Formation des racines laterales dorm antes chez Zygophyllum dumosum. Academie des Sciences, Comptes Rendus, Paris, 263, 909-912. 30 94. N. & Allen, E. (1949) The anatomy of the nodular growths on the roots of Tribulus cistoides L. Proceedings of the Soil Science Society of America, 14, 179-183. 95. Vartanian, N. (1981) Some aspects of structural and functional modifications induced by drought in root systems. Plant and Soil, 63, 83-92. 96. S. & Couderc, H. (1983) Scanning electron microscopic aspects 97.

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