Abstract
The formation of P‐protein in the protophloem of 9‐ to 14‐day‐old adventitious roots of Salix viminalis was studied. In immature sieve elements a finely granular material was present. This was considered to be nascent P‐protein. Small aggregations of tubular P‐protein were observed 17 cells from the first “cleared” sieve element. In older cells the bodies were up to 7 μm long. Nondispersed and disaggregating P‐protein bodies were present in mature sieve elements. P‐protein bodies were also observed in parenchyma cells adjoining mature sieve elements. In addition, inclusion bodies of unknown origin are described. They had a granular content and were most often found in mature sieve elements.
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