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Acid‐induced elongation of Reynoutria stems requires tissue stresses
Author(s) -
Hejnowicz Z.,
Sievers A.
Publication year - 1996
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1034/j.1399-3054.1996.980216.x
Subject(s) - elongation , plant stem , ultimate tensile strength , biophysics , chemistry , osmotic pressure , botany , biology , biochemistry , materials science , composite material
Measurements of the elongation rate of strips of outer tissue composed of epidermis and collenchyma, peeled from the elongating internodes of Reynoutria japonica Houtt. (Japanese knotweed) and stretched in buffer, showed that the rate depended on pH and the stretching force. At pH 6.8, elongation was barely perceptible in the force range studied, but the rate of elongation increased rapidly with the force at pH 5.0 (acid‐induced elongation). The yield threshold stress at pH 5.0 amounted to 1.8×10 6 N m −2 . It was three times higher than the osmotic pressure in the outer tissue, but was lower than the average tensile tissue stress in this tissue in intact stems. We infer that tensile tissue stress in the outer tissue is required for the manifestation of acid‐induced elongation of this tissue in situ.