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Polyphenoloxidase and the Respiration of Ivy Leaves

NATALIE H. LERNER
Journal of Experimental Botany
Vol. 5, No. 13 (Feb. 1954), pp. 79-90
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/23686125
Page Count: 12
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Polyphenoloxidase and the Respiration of Ivy Leaves
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Abstract

1. Polyphenoloxidase is present in ivy leaves but not in those of Aucuba or Euonymus. 2. Respiration of intact ivy leaves was markedly stimulated by catechol (R.Q. approximately = 1), gallic acid, caffeic acid, and dihydroxyphenylalanine. The stimulation was not related to injury as far as could be detected and was not followed by inhibition. The extra oxygen consumption represents a many times repeated oxidation of the amount of catechol supplied. 3. The effect of catechol on the respiration of Aucuba and Euonymus leaves was very small. 4. Cupferron and phenylthiourea, which inhibit polyphenoloxidase in vitro, nevertheless increased respiration when administered to leaves through the petiole. On the other hand, when applied by infiltration, cupferron did cause inhibition, but in Aucuba and Euonymus as much as in ivy.

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