The respiratory metabolism of Strelitzia juncea Ait. seeds. The effect of dormancy release by oxygen on certain glycolytic enzyme activities and metabolite concentrations
1990
De Meillon, S. | Van De Venter, H.A. | Small, J.G.C.
The activity of the glycolytic enzymes PFK, PFP, PK and aldolase as well as the content of glucose, fructose, glucose-6-phosphate and fructose-6-phosphate were compared in the embryos of air and oxygen-incubated seeds of Strelitzia juncea. Determinations were made during the first 4 d of incubation, prior to radicle emergence, which commences on day five for oxygen-treated seeds. No difference in PFK activity was found for the two treatments, and for both treatments PFK tended to increase with the incubation period. The fr2,6P2-stimulated PFP activity was slightly higher for oxygen-incubated seeds, and showed a significant increase in activity over the 4 d incubation period for both treatments. No significant change in the general trend of PK and akdolase activity resulted from incubating the seeds in oxygen. The almost equimolar glucose and fructose contents of the embryos were lower after 1 d of oxygen incubation of the seeds, and the content decreased sharply during the incubation period. It is concluded that a moderate increase in the glycolytic capacity of embryos resulted from oxygen treatment of S. juncea seeds.
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