Separation of malate and malonate pools by the peribacteroid membrane in soybean nodules
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185 - 196
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Using two different methods, gaschromatography and HPLC, differences in the concentrations of organic acids in the host cytoplasm and the peribacteroid space of soybean nodules were detected. A ten times higher concentration of malonate in the host cytoplasm in comparison to the peribacteroid space and also to the bacteroids was found. However, a five times higher concentration of malate was present in the peribacteroid space compared to the host cytoplasm. Furthermore, in the cytoplasm the concentration of citrate was higher than in the peribacteroid space. The results suggest that the peribacteroid membrane separates different pools of organic acids, especially malate and malonate.