Abstract
CAM plants can be divided into two groups, PCK (phosphoenolpyruvate carboxykinase)-CAM and ME (malic enzyme)-CAM plants, based on the difference in decarboxylation process. In ME-CAM plants, pyruvate, Pi dikinase (PPDK) activity is found, and it is involved in the conversion of pyruvate to PEP. PCK-CAM plants lack PPDK activities (1). Recently, we have revealed that in some ME-CAM species, PPDK is present in the cytosol as well as in the chloroplasts of the mesophyll cells (2), although it was conventionally thought to be localized in the chloroplasts (3,4). In Mesembryanthemum crystallinum PPDK was present only in the chloroplasts, whereas in Kalanchoe pinnata and K. daigrenumtiana it was found in both chloroplasts and cytosol (2). ME-CAM plants occur in various families, such as Aizoaceae, Cactaceae, and Crassulaceae. In this study, we investigated the subcellular localization of PPDK for ME-CAM species from various taxonomic groups.
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