Phloem, sieve-element, P-protein, phloem-protein
A survey of the phloem-protein (P-protein) in species of "primitive" angiosperms was undertaken to provide possible evidence for P-protein function from a phylogenetic point of view. The ontogeny and substructure of P-protein in Liriodendron tulipifera and Magnolia soulangeana are similar to that of more advanced dicot species. In the light of this information the time of P-protein evolution seems to coincide with the development of the angiosperms themselves.
Proceedings of the Iowa Academy of Science
©1983 Iowa Academy of Science, Inc.
Friis, Joanne M. and Dute, Roland R.
"Phloem of Primitive Angiosperms. II. P-Protein in Selected Species of the Ranalean Complex,"
Proceedings of the Iowa Academy of Science, 90(2), 78-84.
Available at: https://scholarworks.uni.edu/pias/vol90/iss2/8