Further studies of cryptogam tissue proteins: protein composition and tissue function in plants

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Abstract
Partial analyses have been made of the "whole" proteins of the somatic, photosynthesizing tissues of a variety of cryptogams (a thallophyte, Ulva lactuca; a bryophyte, Lunularia cruciata; and two pteridophytes, Pteridium aqui-linum and Selaginella uncinata), and also of one more phanerogam (Trifolium sub''terraneum). The apparent similarity of composition of tissue proteins of plants from the bryophytes upward through divisions exhibiting increasing degrees of evolutionary development, has been contrasted with the pronounced lack of uniformity in the compositions of seed proteins. An attempt has been made to interpret the findings in terms of hypothetical relationships between tissue function and environment, and protein composition and physical and chem. properties.