Development of cyanide resistant respiration in carnation dianthus caryophyllus cultivar white sim flower petals

Wulster, G.J.; Sacalis, J.N.; Janes, H.W.

Journal of the American Society for Horticultural Science 109(2): 202-206

1984


ISSN/ISBN: 0003-1062
Accession: 005133138

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Abstract
Cyanide-resistant respiration in carnation petal tissue increased daily until 3 days after flowers were harvested. Mitochondria from petals exhibited only cyanide-resistant respiration when malate and pyruvate were provided as substrate. Although intact petals from freshly harvested flowers exhibited little cyanide-resistant respiration, mitochondria isolated from them were highly cyanide-resistant in their respiration if malate and pyruvate were provided as substrate. Pyruvate, in mitochondria, was capable of releasing mitochondria inhibited by cyanide in the presence of malate. Pentose-phosphate pathway activity was significant throughout the postharvest period, but was maximum 5 days after flowers were harvested. The gas exchange quotient (GEQ) was 1 for the first 3 days after harvest, declining on days 4 and 5 and dramatically increasing on day 6 as a result of a climacteric increase in CO2 evolution accompanying flower wilting.