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Crop Science Abstract -

Distribution of 14C-labeled Assimilates in Rape Plants1


This article in CS

  1. Vol. 16 No. 4, p. 530-532
    Received: Dec 22, 1975

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  1. D. J. Major and
  2. W. A. Charnetski



Turnip rape (Brassica campestris L. ‘Span’) grown in the greenhouse and Argentine rape (B. napus L. ‘Zephyr’) grown in the field at Lethbridge, Alta., were exposed to 14CO2 in the lower or upper portion of the plants and sampled up to 48 hours after treatment. Stems and leaves exported 14C-labeled assimilates. High levels of radioactivity suggested that photosynthesis occurred in pods. Roots, pods, beaks, seeds, apices, and barren pods were sinks for assimilates. Lower leaves and lower portions of the stems were the primary sources of assimilates exported to the roots. More 14C-labeled assimilates were detected in plant components sampled from the portions of the plants that were exposed to 14CO2 than from plant components sampled above or below the portion exposed to 14CO2.

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