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DIFFERENTIATION, ORGANOGENESIS, AND THE TECTONICS OF CELL WALL ORIENTATION. II. SEPARATION OF STRESSES IN A TWO‐DIMENSIONAL MODEL
Author(s) -
Lintilhac Philip M.
Publication year - 1974
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1974.tb06038.x
Subject(s) - ovule , biology , tension (geology) , compression (physics) , stress (linguistics) , microbiology and biotechnology , anatomy , embryo , materials science , composite material , linguistics , philosophy
This paper describes a polarographic technique for the separation of tension and compression stresses in a two‐dimensional plastic model of a sectioned cotton ovule. Compression and tension stress trajectories in the model comprise two families of lines which are mutually perpendicular and which, in the “nucellar” region of the model, coincide with cell wall patterns seen in sectioned ovules. This arrangement of stresses is demonstrated, by direct manipulation of the model, to be dependent on the pressure of the integuments. The integuments insure that compressive stresses generated during the growth of the nucellus do not collapse the embryo sac but pass around it, leaving it as a compression‐free space within the growing ovule.