Journal of Experimental Botany, Vol 50, 837-844, Copyright © 1999 by Oxford University Press
H de Wild, E Woltering and H Peppelenbos
Ethylene production in relation to O2 partial pressure of whole pear fruit
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ARTICLES
Carbon dioxide and 1-MCP inhibit ethylene production and respiration of pear fruit by different mechanisms
Agrotechnological Research Institute (ATO-DLO), PO Box 17, 6700 AA Wageningen, The Netherlands; Corresponding author; Fax: +31 317 475347; E-mail: H.W.Peppelenbos@ATO.DLO.NL
C could be described by a
Michaelis-Menten equation. This was indicated by the use of a gas exchange
model. The maximum ethylene production rate was strongly inhibited while
the KmO2 value (1.25 kPa) was not affected by elevated
CO2. Ethylene production was also inhibited by 1-MCP, an inhibitor of
ethylene perception. The reduction in ethylene production by CO2 was
similar for 1-MCP treated and untreated pears. Elevated CO2, therefore,
must have had an influence on ethylene production other than through
ethylene perception. A possible site of inhibition by CO2 is the conversion
of ACC to ethylene. The O2 uptake rate in relation to O2 partial pressure
of whole pear fruit could be described by a Michaelis-Menten equation. The
O2 uptake rate was inhibited by elevated CO2 at a level similar to the
inhibition of ethylene production. Again the KmO2
value (0.68 kPa) was not affected by CO2. Using 1-MCP treatments it was
shown that there was no direct effect of inhibited ethylene production on
O2 uptake rate.Keywords: Gas exchange models,
inhibition, Michaelis-Menten kinetics, pear, Pyrus
communis L.
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