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Plant and Cell Physiology, 1967, Vol. 8, No. 3 353-362
© 1967

Article

THE DISTRIBUTION PATTERN OF CARBON-14 ASSIMILATED BY A SINGLE LEAF IN TOBACCO PLANT1

TOMOHIDE YAMAMOTO2

Okayama Tobacco Experiment Station Tamashima, Okayama

When 14CO2 was administered to a fully expanded leaf (12th leaf) of tobacco plant at the stage just before flower budding, about 30% of 14C assimilated was translocated to other organs after 3 hours. After 21 hours, 20{small tilde}30% of the radioactivity was translocated to the roots, about 20% to upper stem, 10% to lower stem, and 10% to the 17th leaf located directly above the 12th leaf. The amount of 14C translocated to other leaves was small after 31 hours.

When 14CO2 was applied to the 17th leaf, radioactivity in other organs was negligible.

Judging from the time course of 14C-incorporation into organic substances, it was inferred that sucrose imported into the roots from the 12th leaf was converted into compounds of cationic fraction and sugar esters.

14C imported into the 17th leaf was mostly incorporated into 80% ethanol-soluble fraction, especially into sucrose. On the other hand, 14C fixed photosynthetically by the 17th leaf was mostly recovered in starch and protein fraction after 8 hours of 14CO2 assimilation.

1A part of this paper was presented at the Japanese Society of Plant Physiologists, in April, 1965.

2Present address: Central Research Institute, Japan Monopoly Corporation, Shinagawa-ku, Tokyo.

(Received June 20, 1966; )
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