Summary
The sieve tube slime of Tetragonia and Lycopersicum petiolar phloem was subjected to proteolytic enzymes both before and after embedding and sectioning. Subsequent electron microscopical examination confirmed that the fibrillar material is protein in nature, and provided evidence that the protein is acidic rather than basic.
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Yapa, P.A.J., Spanner, D.C. The effect of protease digestion (in situ) on the slime substance of mature sieve tubes. Planta 107, 89–96 (1972). https://doi.org/10.1007/BF00398017
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DOI: https://doi.org/10.1007/BF00398017