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Dark carbon 14 carbon dioxide fixation and translocation of carbon 14 assimilates in cattleya plants

Dark carbon 14 carbon dioxide fixation and translocation of carbon 14 assimilates in cattleya plants

Journal of the Japanese Society for Horticultural Science 58(1): 181-186

By 14CO2 fixation in the dark, the translocation of 14C-assimilates in Cattleya plants (Laeliocattleya Culminant 'La Tuilerie') was investigated during alternating periods of 11 h-light and 13 h-dark. Three samples of the 6-year-old plants having 7 to 9 serial shoots, grown in a greenhouse, were pretreated for two weeks in a growth chamber controlled at 25.degree. C during the 11 h -light period and at 20.degree. C during 13-h dark period. These plants were then placed in a dark assimilation chamber, and three hours later were fed with 500 .mu.Ci 14CO2 for an hour. The plants were individually taken out from the chamber, immediately after the absorption of free 14CO2 with 1N KOH and NaOH (A), subsequently at the end of the first light period; 21 hours post 14CO2-feeding (B), and at the end of the second light period; 45 hours post 14CO2-feeding (C). The organs of each shoot, including leaves and pseudobulbs, were dried at 90.degree. C and their radioactivities were measured. In plant A the 14CO2 fixation rate was highest in the leaves of middle-aged three shoots, relatively high in those of young three shoots, and significantly low in the old leaves. In plant C it was increasingly higher in the young three leaves compared with those of A and B, but there was no significant difference in the activity among pseudobulbs. These results suggest that the assimilates are translocated from middle-aged leaves into younger ones. In addition, comparing the relative specific activity between A and B, it can be surmised that the young leaves have much higher sink capacity.

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Accession: 007177940

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