Abstract
Re-examination of the histological development of the potato tuber supports Artschwager’s view that tuber growth is predominantly due to enlargement of the perimedullary zone and is of procambial origin. Pith (medulla) and cortical regions are differentiated from the ground or fundamental meristem derived from the apical meristem of the stolon apex, even before tuberization has been initiated. The procambium gives rise to external phloem, primary xylem, internal phloem and associated parenchyma, and likewise to interfascicular parenchyma. Those parenchyma cells so formed inwardly to the xylem “ring” contribute to the growth of the perimedullary zone. The sequence of tissue origins is diagrammed and discussed from the viewpoint of modern concepts of histogenesis.
Resumen
La reexaminación del desarrollo histológico del tubérculo de papa le da creencia al punto de vista de Artschwager que el crecimiento del tubérculo se debe sobretodo al engrandecimiento de la zona perimedular y es de origen procambial. La médula y las regiones corticales se desarrollan por la diferenciación del meristemo fundamental que se deriva del meristema apical del ápice del estolón, aún antes de que empiece la tuberización. El procambio de origen al floema external, xilema primario, floema internal y el parénquima asociado y también al parénquima inter-facicular. Las células parenquimáticas formadas hacia el interior en relación al “anillo” de xilema contribuyen al crecimiento de la zona perimedular. Se da un diagrama de la sucesión ed los orígenes de los tejidos y se discute la sucesión desde el punto de vista de los conceptos modernos de histogénesis.
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Reeve, R.M., Hautala, E. & Weaver, M.L. Anatomy and compositional variation within potatoes. American Potato Journal 46, 361–373 (1969). https://doi.org/10.1007/BF02869557
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DOI: https://doi.org/10.1007/BF02869557