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

概要

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When ^<14^gt;CO_2 was administered to a fully expanded leaf (12th leaf) of tobacco plant at the stage just before flower budding, about 30% of ^<14^gt;C assimilated was translocated to other organs after 3 hours. After 21 hours, 20-30% 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 ^<14^gt;C trans-located to other leaves was small after 31 hours. When ^<14^gt;CO_2 was applied to the 17th leaf, radioactivity in other organs was negligible. Judging from the time course of ^<14^gt;C-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. ^<14^gt;C imported into the 17th leaf was mostly incorporated into 80% ethanol-soluble fraction, especially into sucrose. On the other hand, ^<14^gt;C fixed photosynthetically by the 17th leaf was mostly recovered in starch and protein fraction after 8 hours of ^<14^gt;CO_2 assimilation.
日本植物生理学会の論文