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Comparative studies were made between two carnation cvs. Scania and Coral, on the translocation of photosynthates for 24 hours after feeding i4C02 in day time. Eight plants of each cultivar in plastic pots were grown in a greenhouse until the flowering period, and then taken into two growth chambers controlled at 10°C (N 10) or 1St (N 15) in the dark (14 h-day and 10 h-night, 20°C in the day) and kept growing for 40 days from October 1 to November 9. The selected two plants of each cultivar in each growth chamber, namely 8 plants , were put in an assimilation chamber in an isotope-greenhouse and fed with 200 pCi 14C02 for one hour from 1.00 to 2.00 p. m. The plants were taken out immediately (A plot) and 24 hours (B plot) after trapping the residual 14C02 in the chamber with 1 N KOH and NaOH solutions for one hour, respectively. Growth of cv. Scania, namely: stem length, number of leaves and cut flowers, at N 15 was superior to that at N 10. Cv. Coral showed a more significant growth at N 10 than N 15. In cv. Scania grown at N 10, 14C-radioactivity was relatively high in leaves attached to both the primary and secondary branches in A plot, and was highly increased in the terminal and lateral buds of the secondary branches in B plot. In those treated at N 15, the activity was significantly high even in A plot, as well as in B plot. In cv. Coral, irrespective of the thermal treatment, the radioactivity was similarly high in both the terminal and lateral buds on the secondary branches in A plot, with a slight increase in those buds in B plot. In cv. Scania grown at N 15, the percentage of 14C-radioactivity of the secondary branches to the total of the whole plant was as high as about 70% for both A and B plots. In cv. Coral at N 10, the percentage was relatively high, being about 60°o for A plot and 75% for B plot. In the case of N 15, similar results were obtained.

Varietal Difference in Growth and Translocation of 14C-Assimilates in Carnations Grown at Different Night Temperatures