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Acid‐induced changes in the in vivo wall‐yielding properties of hypocotyl sections of Vigna unguiculata
Author(s) -
Mizuno Akiko,
Nakahori Kiyoshi,
Katou Kiyoshi
Publication year - 1993
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 - 10.1111/j.1399-3054.1993.tb05275.x
Subject(s) - hypocotyl , vigna , turgor pressure , xylem , auxin , in vivo , elongation , biophysics , chemistry , vascular bundle , etiolation , fusicoccin , botany , biology , biochemistry , ultimate tensile strength , materials science , microbiology and biotechnology , atpase , metallurgy , gene , enzyme
Elongation growth of hypocotyl sections of Vigna unguiculata under xylem perfusion was significantly enhanced when acid was applied by acid‐aerosol to an abraded hypocotyl surface in the air. The in vivo wall extensibility (φ) and the effective turgor (P i – Y), both of which were determined by the pressure‐jump method, increased during acid‐induced growth as observed in IAA‐induced growth. The intracellular pressure (P i ), however, decreased significantly at the beginning of acid‐induced growth whereas P i scarcely changed in IAA‐induced growth. This result indicates that protons increase the effective turgor by decreasing the yield threshold as IAA does. There seems to be no essential difference between proton and auxin in the effects on the in vivo mechanical properties of the surface cell wall.