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Role of IAA conjugates in inducing ethylene production by tobacco leaf discs
Year:
1984
Source of publication :
Journal of Plant Growth Regulation
Authors :
Aharoni, Nehemia
;
.
Meir, Shimon
;
.
Philosoph-Hadas, Sonia
;
.
Volume :
3
Co-Authors:
Meir, S., Department of Fruit and Vegetable Storage, Agricultural Research Organization, The Volcani Center, Bet Dagan, 50250, Israel
Philosoph-Hadas, S., Department of Fruit and Vegetable Storage, Agricultural Research Organization, The Volcani Center, Bet Dagan, 50250, Israel
Aharoni, N., Department of Fruit and Vegetable Storage, Agricultural Research Organization, The Volcani Center, Bet Dagan, 50250, Israel
Facilitators :
From page:
169
To page:
181
(
Total pages:
13
)
Abstract:
Indole-3-acetic acid (IAA) labeled in its carboxyl group was metabolized by tobacco leaf discs (Nicotiana tabacum L. cv. Xanthi) into three metabolites, two of which were preliminarily characterized as a peptide and an ester-conjugated IAA. Reapplication of each of the three metabolites (at 10 μM) resulted in a marked stimulation of ethylene production and decarboxylation by the leaf discs. Similarly, these three IAA metab olites could induce elongation of wheat coleoptile segments, which was accompanied by decarboxylation. Both the exogenously supplied esteric and peptidic IAA conjugates were converted by the leaf discs into the same metabolites as free IAA. (1-14C)IAA, applied to an isolated epidermis tissue, was completely metabolized to the esteric and peptidic IAA conjugates. This epidermis tissue showed much higher ethylene production rates and lower decarboxylation rates than did the whole leaf disc. The results suggest that the participation of IAA conjugates in the regulation of various physiological processes depends on the release of free IAA, which is obtained by enzymatic hydrolysis of the conjugates in the tissue. The present study demonstrates biological activity of endogenous IAA conjugates that were synthesized by tobacco leaf discs in response to exogenously supplied IAA. © 1984 Springer-Verlag.
Note:
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More details
DOI :
10.1007/BF02042001
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
18620
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:23
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Scientific Publication
Role of IAA conjugates in inducing ethylene production by tobacco leaf discs
3
Meir, S., Department of Fruit and Vegetable Storage, Agricultural Research Organization, The Volcani Center, Bet Dagan, 50250, Israel
Philosoph-Hadas, S., Department of Fruit and Vegetable Storage, Agricultural Research Organization, The Volcani Center, Bet Dagan, 50250, Israel
Aharoni, N., Department of Fruit and Vegetable Storage, Agricultural Research Organization, The Volcani Center, Bet Dagan, 50250, Israel
Role of IAA conjugates in inducing ethylene production by tobacco leaf discs
Indole-3-acetic acid (IAA) labeled in its carboxyl group was metabolized by tobacco leaf discs (Nicotiana tabacum L. cv. Xanthi) into three metabolites, two of which were preliminarily characterized as a peptide and an ester-conjugated IAA. Reapplication of each of the three metabolites (at 10 μM) resulted in a marked stimulation of ethylene production and decarboxylation by the leaf discs. Similarly, these three IAA metab olites could induce elongation of wheat coleoptile segments, which was accompanied by decarboxylation. Both the exogenously supplied esteric and peptidic IAA conjugates were converted by the leaf discs into the same metabolites as free IAA. (1-14C)IAA, applied to an isolated epidermis tissue, was completely metabolized to the esteric and peptidic IAA conjugates. This epidermis tissue showed much higher ethylene production rates and lower decarboxylation rates than did the whole leaf disc. The results suggest that the participation of IAA conjugates in the regulation of various physiological processes depends on the release of free IAA, which is obtained by enzymatic hydrolysis of the conjugates in the tissue. The present study demonstrates biological activity of endogenous IAA conjugates that were synthesized by tobacco leaf discs in response to exogenously supplied IAA. © 1984 Springer-Verlag.
Scientific Publication
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