Abstract
Additions of adjuvants which inhibit the biosynthesis or action of C2H4 show that the climacteric rise in respiration during senescence of cut carnations is a facet of ethylene action and not senescence as such. The rate of CO2 output of carnation flowers was diminished in a dose-dependent mode by low O2. The data indicate that the diminution of respiration by low O2 may not be attributed to the restriction of either of the mitochondrial terminal oxidases. The steady-state concentration of ATP was similar in both air and 2% O2-treated flowers. 2% O2 eliminated for 32 days any rise in C2H4 evolution. In addition the longevity of the flowers kept under 2% O2 was longer than those which were treated with STS. The results are taken to indicate that hypoxia affects developmental events leading to the induction of C2H4 and/or the synthesis of transducer of C2H4 action.
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