Translocation of Radioactive Carbon after the Application of 14C-Alanine and 14CO2 to Sunflower Leaves 1

AUTOR(ES)

Chopowick, R. E.

RESUMO

14C-(UL)-l-Alanine was applied to the surface of mature leaves at the second node of sunflower (Helianthus annuus L. cv Commander) plants, under illumination. The alanine was absorbed during a 4-hour period, and some of it was metabolized by the absorbing tissue. After a lag period of about 15 minutes from first application, distribution of 14C through the plant proceeded in much the same pattern as when 14CO2 is assimilated by similar leaves. Most, if not all, of the 14C exported from the absorbing regions was in sucrose. Only minute amounts appeared in alanine or other amino acids in surrounding parts of the leaf blade or in the petiole, although these were strongly labeled in the tissue absorbing 14C-alanine.

Documentos Relacionados

• Carbon Dioxide Exchanges in Leaves. I. Discrimination Between 14CO2 and 12CO2 in Photosynthesis 1
• Effects of O2 Tension and Temperature during Light Uptake of 14CO2 on the Dark Release of 14CO2 by Excised C3 and C4 Leaves 1
• Dark Release of 14CO2 from Higher Plant Leaves 1
• 14C2H4: Its Incorporation and Oxidation to 14CO2 by Cut Carnations 1
• Galactolipid Synthesis in Vicia faba Leaves: I. Galactose, Glycerol, and Fatty Acid Labeling after 14CO2 Feeding 1