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Plant and Cell Physiology, 1977, Vol. 18, No. 3 715-719
© 1977

Short communication

Effect of temperature on the ethylene-synthesizing systems in apple, tomato and Penicillium digitatum

Autar K. Mattoo1, James E. Baker, Edo Chalutz2 and Morris Lieberman

Post Harvest Plant Physiology Laboratory, Beltsville Agricultural Research Center (West), U. S. Department of Agriculture Beltsville, Maryland 20705, U. S. A.

Arrhenius plots of ethylene-synthesizing systems of apple and tomato showed discontinuities while the plot for Penicillium digitatum was linear. Triton X-100 markedly lowered the activation energies of the apple and tomato systems without altering that of the fungal system. The data presented suggest that the lipid micro-environment of the ethylene-synthesizing enzyme systems in higher plants and P. digitatum are different, and that cell membrane-cell wall complex may be the site of ethylene-synthesizing enzymic systems in higher plants.

1 On leave from the M. S. University of Baroda, India.

2 On leave from the Agricultural Research Organization, The Volcani Center, Israel.

(Received February 7, 1977; )
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