Plasmodesmata in Xylem Vessels

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Abstract
Plasmodesmata, theoretically accepted although not previously demonstrated, occur in the spiral, reticulate, and pitted vessels of the xylem of the leaf of Acanthus mollis, the stem of E chino-cvstis macrocarpa, and the root of Vicia faba. Irrigation of sections with I-KI-H2SO4 is a useful technique. In the seedling root of V. faba, living protoplasts persist in spiral vessel segments and in secondary pitted vessels to a distance of,8 cm. from the root tip[long dash]about 5 cm. above the root hair zone. The occurrence of living cells must be taken into account in the future consideration of such problems as absorption and translocation.