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Observations on Giant Cells in Potato Roots Infected with Heterodera rostochiensis

  • C. S. Cole (a1) and H. W. Howard (a1)

Extract

Giant cell formation was studied in the roots of potatoes grown in a soil infested with Heterodera rostochiensis.

Some indication of giant cell formation was found in roots fixed 14 days after planting of sprouted tubers in the infested soil.

Giant cells may be formed by the cells of the cortex, the endodermis, the pericycle and the parenchyma cells of the central vascular strand.

The first giant cells appear to be formed in the cortex and pericycle.

Giant cells in the cortex are only found near the head of an eelworm.

Giant cell formation by the parenchyma cells of the central vascular strand leads to no cambium and hence no secondary xylem being produced in those sectors of the root where they occur.

The occurrence of sectors of the root in which there is no secondary xylem gives the central vascular strand an irregular appearance.

Some giant cells may be multinucleate. They all have granular cytoplasm.

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References

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Artschwager, E., 1918.—“Anatomy of the potato plant, with special reference to the ontogeny of the vascular system.” J. agric. Res., 14, 221–52.(W.L. 10966)
Filipjev, I. N. and Stekhoven, Schuurmans Jr, J. H., , 1941.—“A manual of agricultural helminthology.” Leiden: E. J. Brill, xv+878 pp.
Franklin, M. T., 1951.—“The cyst-forming species of Heterodera”. Farnham Royal: Commonwealth Agricultural Bureaux, iv+147 pp.
Hayward, H. E., 1938.—“The structure of economic plants.” New York: The MacMillan Company, x+674 pp.
Nemec, B., 1933.—“Uber die Gallen von Heterodera schachtii auf der Zuckerrübe”. Stud. Pl. physiol. Lab. Charles Univ., 4, 114. (W.L. 20664a)
O'Brien, D. G. and Prentice, E. G., 1930.—“An eelworm disease of potatoes caused by Heterodera schachtii”. Scot. J. Agric., 13, 415–32. (W.L. 20010)
Randolph, L. F., 1935.—“A new fixing fluid and a revised schedule for the paraffin method in plant cytology”. Stain Tech., 10, 95–90. (W.L. 20540b)

Observations on Giant Cells in Potato Roots Infected with Heterodera rostochiensis

  • C. S. Cole (a1) and H. W. Howard (a1)

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