Sugar in the Intercellular Spaces of White Mustard Roots

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Abstract
A method is described by which it is possible to test directly for the presence of translocated radioactive sugar in the apical meristem of white mustard roots. Transverse sections of frozen root tips, following treatment of living seedlings with radioactive glucose are examined by radioautography. Radioactivity is concentrated in the conspicuous intercellular spaces and to a lesser degree in the intervening cell walls. These results are in harmony with the theory of Priestley that the intercellular spaces and cell walls are the channels of transport of soluble nutrients from the ends of differentiating vascular strands to the dividing cells in the root meristem.

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