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Agronomy Journal Abstract -

Translocation of Labelled Sucrose from Selected Cotton Leaves1


This article in AJ

  1. Vol. 61 No. 3, p. 436-438

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  1. Wayne E. Sabbe and
  2. George W. Cathey2



Studies were made to determine the movement of metabolic-14C from sucrose during flowering and fruiting of the cotton (Gossypium hirsutum) plant. The translocation and sinks were studied by using radioactive 14Csucrose applied at various locations on the plant and at various stages of plant development.

Label from 14C-sucrose was found to translocate from fruiting branches to roots of cotton plants before young bolls were initiated. However, upon initiation of bolls the roots did not continue as a major sink. At the time of first flower the label showed a tendency to translocate to regions of rapid growth (i.e., young bolls) both above and below the treated branch. There was a tendency for the fruiting branch more nearly in vertical alignment with the treated branch to receive a larger quantity of translocate than branches on the opposite side of the stem.

When the osmotic pressure of the liquid nutrient culture was increased, the 24C-label showed a tendency toward downward translocation during the flowering stage of the plant development. The radioactivity of the roots increased when the osmotic pressure of the nutrient solution was increased.

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