Effect of Ethylene on [14C]Indole-3-Acetic Acid Metabolism in Leaf Tissues of Woody Plants
Identifieur interne : 000545 ( Ncbi/Curation ); précédent : 000544; suivant : 000546Effect of Ethylene on [14C]Indole-3-Acetic Acid Metabolism in Leaf Tissues of Woody Plants
Auteurs : Joseph Riov ; Nachum Dror ; Raphael GorenSource :
- Plant Physiology [ 0032-0889 ] ; 1982.
Abstract
The effect of ethylene on [14C]indole-3-acetic acid (IAA) metabolism was investigated in defoliation sensitive leaf tissues of citrus (
Url:
PubMed: 16662665
PubMed Central: 1065873
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C]Indole-3-Acetic Acid Metabolism in Leaf Tissues of Woody Plants</title>
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<author><name sortKey="Dror, Nachum" sort="Dror, Nachum" uniqKey="Dror N" first="Nachum" last="Dror">Nachum Dror</name>
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<author><name sortKey="Goren, Raphael" sort="Goren, Raphael" uniqKey="Goren R" first="Raphael" last="Goren">Raphael Goren</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Effect of Ethylene on [<sup>14</sup>
C]Indole-3-Acetic Acid Metabolism in Leaf Tissues of Woody Plants</title>
<author><name sortKey="Riov, Joseph" sort="Riov, Joseph" uniqKey="Riov J" first="Joseph" last="Riov">Joseph Riov</name>
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<author><name sortKey="Dror, Nachum" sort="Dror, Nachum" uniqKey="Dror N" first="Nachum" last="Dror">Nachum Dror</name>
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<author><name sortKey="Goren, Raphael" sort="Goren, Raphael" uniqKey="Goren R" first="Raphael" last="Goren">Raphael Goren</name>
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<series><title level="j">Plant Physiology</title>
<idno type="ISSN">0032-0889</idno>
<idno type="eISSN">1532-2548</idno>
<imprint><date when="1982">1982</date>
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<front><div type="abstract" xml:lang="en"><p>The effect of ethylene on [<sup>14</sup>
C]indole-3-acetic acid (IAA) metabolism was investigated in defoliation sensitive leaf tissues of citrus (<italic>Citrus sinensis</italic>
) and resistant leaf tissues of eucalyptus (<italic>Eucalyptus camaldulensis</italic>
). IAA metabolites were fractionated into 80% ethanol-soluble, H<sub>2</sub>
O-soluble, NaOH-soluble, and insoluble components. In citrus, pretreatment with 25 microliters per liter ethylene for 24 hours significantly increased the amount of ethanol- and H<sub>2</sub>
O-extractable conjugates during the first hour of incubation in [<sup>14</sup>
C]IAA and increased 3- to 4-fold the formation of NaOH-extractable conjugates during the entire 6-hour incubation period. However, induction of the IAA-aspartate conjugation system was inhibited by ethylene. In eucalyptus, ethylene pretreatment only slightly stimulated the formation of IAA metabolites. Increased formation of ethanol-extractable conjugates in ethylene-pretreated eucalyptus tissues was observed only after 6 hours of incubation. Chromatographic analysis indicated that the ethanol and H<sub>2</sub>
O extracts of both species contained various low molecular weight conjugates, whereas in citrus leaf tissues high molecular weight conjugates accounted for most of the greater radioactivity detected in the NaOH extracts as a result of ethylene-pretreatment. It is suggested that ethylene may reduce the level of endogenous IAA in citrus leaf tissues by stimulating IAA conjugation.</p>
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