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Characteristics and implications of prolonged fusicoccin‐induced growth of Avena coleoptile sections
Author(s) -
Cleland Robert E.
Publication year - 1994
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.1399-3054.1994.tb02520.x
Subject(s) - fusicoccin , coleoptile , avena , elongation , apoplast , auxin , phytotoxin , biophysics , chemistry , botany , biochemistry , biology , toxin , materials science , cell wall , atpase , ultimate tensile strength , gene , metallurgy , enzyme
A study has been made of the prolonged growth of Avena coleoptile sections in response to fusicoccin (FC), a phytotoxin that promotes apoplastic acidification. The final amount of FC‐induced growth is a function of the FC concentration. Removal of the epidermis speeds up the initial rate of elongation and shortens the duration of the response, without affecting the total amount of extension. A suboptimal FC concentration (7×10 −8 M ) which induces the same rate of proton excretion as does optimal indoleacetic acid (IAA) (1×10 −5 M ), causes elongation which is 60–75% of that induced by IAA in 4 h or 50–65% in 7 h. This suggests that acid‐induced extension could make a major contribution to auxin‐induced growth for at least 7 h.