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Translocation of ¹⁴C-labeled Assimilate and Photosynthesis in C₃ and C₄ Species¹

A survey of 17 C₄ and 17 C₃ species of higher plants was made in two experiments to determine differences in the percentage of ¹⁴C-assimilate translocated in 6 hours. Leaves were labeled for 15 min with ¹⁴C0₂ in the light. In one experiment net photosynthesis was also determined on leaves labeled with ¹⁴C. C₄ plants exported more, and C₃ species less, than 49% of the assimilated ¹⁴C in 6 hours. There were only four exceptions to this division in 49 means reported. These exceptions were cases where C₄ species translocated less than 49% of the labeled assimilate. The C₄/C₃ ratios for translocation percentages were 1.55 and 1.67 for the two experiments. The C₄/C₃ ratio for net photosynthesis was 1.44. The correlation between net photosynthesis and translocation had a significant (P < 0.05) but not a high coefficient (r = 0.59). It is concluded that although net photosynthesis and percentage of ¹⁴C assimilate export are related, some other factors also play significant roles which affect this relationship.

Key Words: ¹⁴C-photosynthate • CO₂ • fixation • Photosynthate movement

² Former postdoctoral fellow (now lecturer in drop botany, Agriculture Dep., Univ. of Papua New Guinea, Port Moresby, Papua New Guinea), professor, and associate professor of Agronomy, respectively.

Received for publication July 10, 1975.