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- W1974437112 abstract "Changes in the oxygen uptake of petal slices by the cytochrome and alternative respiratory pathways were monitored during petal development in the arctic herb Saxifraga cernua. As the petals developed, rates of total respiration increased to a maximum rate during petal unfolding (day 4.5), and thereafter declined. Respiration in petals of all ages was at least partially resistant to cyanide, indicating the capacity for the alternative pathway. In all, except day 1 and senescing day 8 petals, respiration was inhibited by salicylhydroxamic acid, indicating engagement of the alternative pathway. In general, temporal changes in the respiratory activity along each pathway were similar and in parallel with changes in total respiration, although maximum rates along each pathway occurred at different times. Maximum cytochrome pathway activity occurred during petal expansion (day 4) whereas the alternative pathway peaked during petal unfolding at day 4.5. The control of respiration was also investigated. In the presence of salicylhydroxamic acid, the addition of the uncoupler carbonyl cyanide m-chlorophenylhydrazone was never stimulatory, suggesting that the cytochrome pathway was not restricted by adenylate levels. The addition of sucrose stimulated respiration only in day 1 petals, suggesting substrate limitation at this developmental stage. Since the rate of alternative pathway respiration peaked during petal unfolding, a time of high energy requirement, we suggest that the alternative pathway may have been used as an inefficient energy source during petal development." @default.
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- W1974437112 date "1991-01-01" @default.
- W1974437112 modified "2023-09-25" @default.
- W1974437112 title "Respiratory Shifts in Developing Petals of Saxifraga cernua" @default.
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- W1974437112 doi "https://doi.org/10.1104/pp.95.1.324" @default.
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