COPPER ENZYMES IN ISOLATED CHLOROPLASTS. POLYPHENOLOXIDASE IN BETA VULGARIS

COPPER ENZYMES IN ISOLATED CHLOROPLASTS. POLYPHENOLOXIDASE IN BETA VULGARIS NUMBER 1 D ANIE L I . AR NO N* (WITH EIGHT FIGURES) Received August 4, 1948 The chloroplast, as the seat of chlorophyll pigments in plants, occupies a unique position in the economy of the green cell. In recent years there has been a renewed interest in the reactions and properties of chloroplasts as a result of the work of HIL (11, 12) and HIL and SCARISBRICK (13, 14) who demonstrated that the reaction characteristic of photosynthesis in green plants, the evolution of oxygen, occurs in appreciable quantities in isolated chloroplasts under the influence of light and in the presence of suitable oxidants (2, 7, 8, 26). In the course of an investigation of oxygen evolution by isolated chloroplasts it was deemed important to explore their enzymatic composition. Of special interest were considered enzymes capable of participating in oxidation-reduction reactions, and more particularly, those localized principally, if not entirely, in the chloroplasts. This paper presents evidence that a copper enzyme, polyphenoloxidase (otherwise known as tyrosinase or catecholase), is localized in the chloroplasts of spinach beet (chard), Beta vu.'garis. Methods GROWING OF PLANTS.-Seeds of spinach beet were germinated and grown in sand in flower pots in a greenhouse, http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

COPPER ENZYMES IN ISOLATED CHLOROPLASTS. POLYPHENOLOXIDASE IN BETA VULGARIS

Jan 19, 1949

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Publisher
American Society of Plant Biologist
Copyright
Copyright © 1949 by the American Society of Plant Biologists
ISSN
1532-2548
eISSN
0032-0889
Publisher site
See Article on Publisher Site

Abstract

NUMBER 1 D ANIE L I . AR NO N* (WITH EIGHT FIGURES) Received August 4, 1948 The chloroplast, as the seat of chlorophyll pigments in plants, occupies a unique position in the economy of the green cell. In recent years there has been a renewed interest in the reactions and properties of chloroplasts as a result of the work of HIL (11, 12) and HIL and SCARISBRICK (13, 14) who demonstrated that the reaction characteristic of photosynthesis in green plants, the evolution of oxygen, occurs in appreciable quantities in isolated chloroplasts under the influence of light and in the presence of suitable oxidants (2, 7, 8, 26). In the course of an investigation of oxygen evolution by isolated chloroplasts it was deemed important to explore their enzymatic composition. Of special interest were considered enzymes capable of participating in oxidation-reduction reactions, and more particularly, those localized principally, if not entirely, in the chloroplasts. This paper presents evidence that a copper enzyme, polyphenoloxidase (otherwise known as tyrosinase or catecholase), is localized in the chloroplasts of spinach beet (chard), Beta vu.'garis. Methods GROWING OF PLANTS.-Seeds of spinach beet were germinated and grown in sand in flower pots in a greenhouse,

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