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Distribution of ¹⁴C-labeled Assimilates in Rape Plants¹

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.

Key Words: Radioisotopes • ¹⁴CO₂ labeling • Brassica spp.

Received for publication December 22, 1975.