Summary
Choline, a necessary compound in an artificial diet for phloem-feeding aphids, was determined quantitatively in the phloem exudates of 16 tree species. The method used was a combination of choline oxidase action and oxygen determination with an oxygen electrode. Choline was found in all species, the concentration ranging between 36 and 5340 μM.
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Kaiser, K.A., Ziegler, H. Determination of choline in phloem exudates of trees. Trees 1, 189–190 (1987). https://doi.org/10.1007/BF00193561
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DOI: https://doi.org/10.1007/BF00193561