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The ontogeny of the vascular cambium in hoheria angustifolia


, : The ontogeny of the vascular cambium in hoheria angustifolia. New Phytologist 77(2): 409-420

The procambium in H. angustifolia (Malvaceae) develops behind the apical meristem as an almost complete cylinder of meristematic cells. Differentiating protophloem strands are separated by narrow interfascicular sectors. These sectors also interrupt the procambial cylinder. The 1st protoxylem elements differentiate as discrete bundles to the inside of a number of protophloem strands and remain separated from them by an actively dividing procambial cylinder 6-8 cells wide. Periclinal divisions also occur in the interfascicular sectors so that by the center of the 1st internode below the shoot tip the procambium forms a complete cylinder. In this way the short cells of the interfascicular sectors become transformed into primordial ray initials. Repeated periclinal division in the procambium leads to the radial seriation of its cells. Subsequent differentiation of the derivatives produces complete cylinders of metaxylem and metaphloem by the 3rd internode. Internodal elongation ends by the 5th or 6th internode below the shoot tip after which the transverse ended primordial fusiform cells of the procambium become transformed into fusiform cambial cells with pointed tips. Except during ray formation, transverse division ceases and the non-storied cambium gradually acquires a storied appearance in tangential view by repeated radial longitudinal divisions accompanying radial growth. The 1st new rays appear about the 7th internode. The transition from procambium to cambium in H. angustifolia is a graudal one with the meristem acquiring some cambial characteristics before and some after internodal elongation has ceased.

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