Premium
Effect of silver ions and ethylene on auxin metabolism and auxininduced ethylene production in tobacco leaf discs
Author(s) -
Aharoni Nehemia
Publication year - 1985
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.1399-3054.1985.tb02323.x
Subject(s) - ethylene , auxin , incubation , chemistry , decarboxylation , metabolism , botany , biochemistry , biology , catalysis , gene
The antagonistic effects of ethylene and Ag + on the metabolism of [1‐ 14 C]indole‐3‐acetic acid (IAA) and on the rates of ethylene production were studied in tobacco leaf discs ( Nicotiana rustica var. Brasilia ). During the first 10 h of incubation, Ag + ‐pretreated leaf discs contained more free [ 14 C]IAA than untreated ones due to decreased oxidative decarboxylation, and the discs also produced more ethylene. Exogenously supplied ethylene nullified these effects of Ag + . However, the most pronounced effect of Ag + in increasing ethylene production, as well as the strongest antagonistic effect of exogenous ethylene, were found between 24 and 48 h of incubation. During this time span no effect on the level of free IAA and on its decarboxylation could be observed. It is suggested that ethylene exerted its autoinhibitory effect by a feedback control on the IAA‐induced ethylene biosynthesis. Possible mechanisms for the autoinhibitory effect of ethylene are discussed.