Journal
JOURNAL OF PLANT PHYSIOLOGY
Volume 164, Issue 1, Pages 39-46Publisher
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.jplph.2005.09.016
Keywords
Cucurbita pepo; Kalanchoe blossfeldiana; ascorbic acid; ascorbic acid oxidase; oxygen management
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Ascorbic acid oxidase (AAO) is a plant blue-copper protein catalyzing dioxygen reduction to water using ascorbic acid as the electron donor. In spite of extensive molecular characterization the physiological role of AAO is still uncertain. Abundant mRNA, protein and activity of AAO were observed in illuminated Leaves of Cucurbita pepo. AAO activity was found to be proportional to light intensity. The tight effect was rapidly reversed in dark and activity remained tow throughout the dark period. Activity was elicited in dark by increased oxygen concentration. AAO activity increased in the facultative CAM Kalanchoe blossfeldiana upon induction of the CAM cycle and decreased during germination of C. pepo and Zea mays under hypoxic conditions. These results strongly suggest that AAO activity could be part of a dynamic system for oxygen management in plants. (c) 2005 Elsevier GmbH. All rights reserved.
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