Studies on the Assimilation and Translocation of 14CO2 in Ladino Clover : II. Distribution of 14C in various fraction of assimilates in plants

[摘要] Whole plants of Ladino clover were exposed in light to 14CO2 for 4 1/2 hours and distribution of 14C in ethanol, acid, alkali-soluble fractions and residue immediately after and 4 days after 14CO2 treatment were investigated. Young leaves assimilate actively and retain considerable parts of their assimilates as a structural component, i.e., alkali-soluble fraction and residue (mainly protein and cellulose). The biosynthesis in these fractons seemes to be progressing rapidly, and even immediately after 14CO2 treatment 14C was widely distributed in the structural fractions of young parts of plant. Older leaves use greater parts of their assimilates by respiration and send them to other parts of plant. therefore 14C activity decreased significantly from immediately after 14CO2 treatment to 4 days after treatment. 14C-assimilates were translocated and accumulated as a structural or reserved fraction, namely, acid and alkali-soluble fractions and residue to young parts of stolon near growing points. 14C-assimilates in older part of stolon immediately after 14CO2 treatment were mainly in ethanol soluble fraction. Four days after treatment 14C activity decreased significantly and 14C was distributed in reserved and structural fractions, but in small amounts. Young parts of petiole, root, lateral buds and growing points of stolon were important sink of assimilates in Ladino clover.

[学科分类] 农业科学（综合）