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Inhibition of α-ketoglutarate dehydrogenase activity affects adventitious root growth in poplar via changes in GABA shunt.

Identifieur interne : 000E18 ( Main/Exploration ); précédent : 000E17; suivant : 000E19

Inhibition of α-ketoglutarate dehydrogenase activity affects adventitious root growth in poplar via changes in GABA shunt.

Auteurs : Jianyun Yue [République populaire de Chine] ; Changjian Du [République populaire de Chine] ; Jing Ji [République populaire de Chine] ; Tiantian Xie [République populaire de Chine] ; Wei Chen [République populaire de Chine] ; Ermei Chang [République populaire de Chine] ; Lanzhen Chen [République populaire de Chine] ; Zeping Jiang [République populaire de Chine] ; Shengqing Shi [République populaire de Chine]

Source :

RBID : pubmed:29982922

Descripteurs français

English descriptors

Abstract

MAIN CONCLUSION

Blocking α-ketoglutarate dehydrogenase results in up-regulation of γ-aminobutyric acid (GABA) shunt activity, and inhibits the growth of poplar adventitious roots (ARs), indicating that AR growth is closely associated with GABA shunt. γ-Aminobutyric acid (GABA) shunt starts from α-ketoglutarate in the tricarboxylic acid cycle, which is thought to represent the cross road between carbon and nitrogen metabolism. Previous studies (Araújo et al. 2012b, Plant Cell 24: 2328-2351) have shown that blocking α-ketoglutarate dehydrogenase (α-KGDH) affects the GABA shunt activity, and inhibits growth. However, its effects on the growth of adventitious roots (ARs) are unclear. In this study, the growth of ARs in tissue-cultured 84K poplar (Populus alba × Populus glandulosa cv. '84K') was significantly inhibited when succinyl phosphate (SP), a specific inhibitor of α-KGDH, was supplied. The inhibition of ARs was associated with significant changes in the levels of soluble sugars, organic acids, and amino acids, and was coupled with the up-regulation of the GABA shunt activity at the transcriptional and translational levels. Exogenous GABA also inhibited AR growth following the increase of the endogenous GABA level. Transcriptomic analyses further showed that genes related to cell wall carbon metabolism and phytohormone (indoleacetic acid, ABA, and ethylene) signaling were affected by the changes of GABA shunt activity, resulting from the α-KGDH inhibition. Thus, our study indicates that the inhibition of poplar AR growth by blocking α-KGDH is closely associated with GABA shunt, which would benefit a better understanding of GABA's roles in plant development and stress response.


DOI: 10.1007/s00425-018-2929-3
PubMed: 29982922


Affiliations:

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Le document en format XML

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<term>Amino Acids (metabolism)</term>
<term>Carbon (metabolism)</term>
<term>Cell Wall (metabolism)</term>
<term>Gene Expression Profiling (MeSH)</term>
<term>Ketoglutarate Dehydrogenase Complex (antagonists & inhibitors)</term>
<term>Ketoglutarate Dehydrogenase Complex (genetics)</term>
<term>Ketoglutarate Dehydrogenase Complex (metabolism)</term>
<term>Plant Growth Regulators (metabolism)</term>
<term>Plant Proteins (antagonists & inhibitors)</term>
<term>Plant Proteins (genetics)</term>
<term>Plant Proteins (metabolism)</term>
<term>Plant Roots (drug effects)</term>
<term>Plant Roots (enzymology)</term>
<term>Plant Roots (growth & development)</term>
<term>Populus (drug effects)</term>
<term>Populus (enzymology)</term>
<term>Populus (growth & development)</term>
<term>Signal Transduction (drug effects)</term>
<term>Succinates (pharmacology)</term>
<term>Up-Regulation (MeSH)</term>
<term>gamma-Aminobutyric Acid (genetics)</term>
<term>gamma-Aminobutyric Acid (metabolism)</term>
<term>gamma-Aminobutyric Acid (pharmacology)</term>
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<term>Acide gamma-amino-butyrique (génétique)</term>
<term>Acide gamma-amino-butyrique (métabolisme)</term>
<term>Acide gamma-amino-butyrique (pharmacologie)</term>
<term>Acides aminés (métabolisme)</term>
<term>Analyse de profil d'expression de gènes (MeSH)</term>
<term>Carbone (métabolisme)</term>
<term>Facteur de croissance végétal (métabolisme)</term>
<term>Ketoglutarate dehydrogenase complex (antagonistes et inhibiteurs)</term>
<term>Ketoglutarate dehydrogenase complex (génétique)</term>
<term>Ketoglutarate dehydrogenase complex (métabolisme)</term>
<term>Paroi cellulaire (métabolisme)</term>
<term>Populus (croissance et développement)</term>
<term>Populus (effets des médicaments et des substances chimiques)</term>
<term>Populus (enzymologie)</term>
<term>Protéines végétales (antagonistes et inhibiteurs)</term>
<term>Protéines végétales (génétique)</term>
<term>Protéines végétales (métabolisme)</term>
<term>Racines de plante (croissance et développement)</term>
<term>Racines de plante (effets des médicaments et des substances chimiques)</term>
<term>Racines de plante (enzymologie)</term>
<term>Régulation positive (MeSH)</term>
<term>Succinates (pharmacologie)</term>
<term>Transduction du signal (effets des médicaments et des substances chimiques)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="antagonists & inhibitors" xml:lang="en">
<term>Ketoglutarate Dehydrogenase Complex</term>
<term>Plant Proteins</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="genetics" xml:lang="en">
<term>Ketoglutarate Dehydrogenase Complex</term>
<term>Plant Proteins</term>
<term>gamma-Aminobutyric Acid</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en">
<term>Amino Acids</term>
<term>Carbon</term>
<term>Ketoglutarate Dehydrogenase Complex</term>
<term>Plant Growth Regulators</term>
<term>Plant Proteins</term>
<term>gamma-Aminobutyric Acid</term>
</keywords>
<keywords scheme="MESH" qualifier="antagonistes et inhibiteurs" xml:lang="fr">
<term>Ketoglutarate dehydrogenase complex</term>
<term>Protéines végétales</term>
</keywords>
<keywords scheme="MESH" qualifier="croissance et développement" xml:lang="fr">
<term>Populus</term>
<term>Racines de plante</term>
</keywords>
<keywords scheme="MESH" qualifier="drug effects" xml:lang="en">
<term>Plant Roots</term>
<term>Populus</term>
<term>Signal Transduction</term>
</keywords>
<keywords scheme="MESH" qualifier="effets des médicaments et des substances chimiques" xml:lang="fr">
<term>Populus</term>
<term>Racines de plante</term>
<term>Transduction du signal</term>
</keywords>
<keywords scheme="MESH" qualifier="enzymologie" xml:lang="fr">
<term>Populus</term>
<term>Racines de plante</term>
</keywords>
<keywords scheme="MESH" qualifier="enzymology" xml:lang="en">
<term>Plant Roots</term>
<term>Populus</term>
</keywords>
<keywords scheme="MESH" qualifier="growth & development" xml:lang="en">
<term>Plant Roots</term>
<term>Populus</term>
</keywords>
<keywords scheme="MESH" qualifier="génétique" xml:lang="fr">
<term>Acide gamma-amino-butyrique</term>
<term>Ketoglutarate dehydrogenase complex</term>
<term>Protéines végétales</term>
</keywords>
<keywords scheme="MESH" qualifier="metabolism" xml:lang="en">
<term>Cell Wall</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr">
<term>Acide gamma-amino-butyrique</term>
<term>Acides aminés</term>
<term>Carbone</term>
<term>Facteur de croissance végétal</term>
<term>Ketoglutarate dehydrogenase complex</term>
<term>Paroi cellulaire</term>
<term>Protéines végétales</term>
</keywords>
<keywords scheme="MESH" qualifier="pharmacologie" xml:lang="fr">
<term>Acide gamma-amino-butyrique</term>
<term>Succinates</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en">
<term>Succinates</term>
<term>gamma-Aminobutyric Acid</term>
</keywords>
<keywords scheme="MESH" xml:lang="en">
<term>Gene Expression Profiling</term>
<term>Up-Regulation</term>
</keywords>
<keywords scheme="MESH" xml:lang="fr">
<term>Analyse de profil d'expression de gènes</term>
<term>Régulation positive</term>
</keywords>
</textClass>
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<front>
<div type="abstract" xml:lang="en">
<p>
<b>MAIN CONCLUSION</b>
</p>
<p>Blocking α-ketoglutarate dehydrogenase results in up-regulation of γ-aminobutyric acid (GABA) shunt activity, and inhibits the growth of poplar adventitious roots (ARs), indicating that AR growth is closely associated with GABA shunt. γ-Aminobutyric acid (GABA) shunt starts from α-ketoglutarate in the tricarboxylic acid cycle, which is thought to represent the cross road between carbon and nitrogen metabolism. Previous studies (Araújo et al. 2012b, Plant Cell 24: 2328-2351) have shown that blocking α-ketoglutarate dehydrogenase (α-KGDH) affects the GABA shunt activity, and inhibits growth. However, its effects on the growth of adventitious roots (ARs) are unclear. In this study, the growth of ARs in tissue-cultured 84K poplar (Populus alba × Populus glandulosa cv. '84K') was significantly inhibited when succinyl phosphate (SP), a specific inhibitor of α-KGDH, was supplied. The inhibition of ARs was associated with significant changes in the levels of soluble sugars, organic acids, and amino acids, and was coupled with the up-regulation of the GABA shunt activity at the transcriptional and translational levels. Exogenous GABA also inhibited AR growth following the increase of the endogenous GABA level. Transcriptomic analyses further showed that genes related to cell wall carbon metabolism and phytohormone (indoleacetic acid, ABA, and ethylene) signaling were affected by the changes of GABA shunt activity, resulting from the α-KGDH inhibition. Thus, our study indicates that the inhibition of poplar AR growth by blocking α-KGDH is closely associated with GABA shunt, which would benefit a better understanding of GABA's roles in plant development and stress response.</p>
</div>
</front>
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<Day>23</Day>
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<Volume>248</Volume>
<Issue>4</Issue>
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<Title>Planta</Title>
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<ArticleTitle>Inhibition of α-ketoglutarate dehydrogenase activity affects adventitious root growth in poplar via changes in GABA shunt.</ArticleTitle>
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<AbstractText Label="MAIN CONCLUSION" NlmCategory="UNASSIGNED">Blocking α-ketoglutarate dehydrogenase results in up-regulation of γ-aminobutyric acid (GABA) shunt activity, and inhibits the growth of poplar adventitious roots (ARs), indicating that AR growth is closely associated with GABA shunt. γ-Aminobutyric acid (GABA) shunt starts from α-ketoglutarate in the tricarboxylic acid cycle, which is thought to represent the cross road between carbon and nitrogen metabolism. Previous studies (Araújo et al. 2012b, Plant Cell 24: 2328-2351) have shown that blocking α-ketoglutarate dehydrogenase (α-KGDH) affects the GABA shunt activity, and inhibits growth. However, its effects on the growth of adventitious roots (ARs) are unclear. In this study, the growth of ARs in tissue-cultured 84K poplar (Populus alba × Populus glandulosa cv. '84K') was significantly inhibited when succinyl phosphate (SP), a specific inhibitor of α-KGDH, was supplied. The inhibition of ARs was associated with significant changes in the levels of soluble sugars, organic acids, and amino acids, and was coupled with the up-regulation of the GABA shunt activity at the transcriptional and translational levels. Exogenous GABA also inhibited AR growth following the increase of the endogenous GABA level. Transcriptomic analyses further showed that genes related to cell wall carbon metabolism and phytohormone (indoleacetic acid, ABA, and ethylene) signaling were affected by the changes of GABA shunt activity, resulting from the α-KGDH inhibition. Thus, our study indicates that the inhibition of poplar AR growth by blocking α-KGDH is closely associated with GABA shunt, which would benefit a better understanding of GABA's roles in plant development and stress response.</AbstractText>
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<Grant>
<GrantID>CAFYBB2014ZX001-3</GrantID>
<Agency>Fundamental Research Funds for the Central Non-profit Research Institution of CAF</Agency>
<Country></Country>
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<Grant>
<GrantID>2016YFD0600105</GrantID>
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<Grant>
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<name sortKey="Chen, Lanzhen" sort="Chen, Lanzhen" uniqKey="Chen L" first="Lanzhen" last="Chen">Lanzhen Chen</name>
<name sortKey="Chen, Wei" sort="Chen, Wei" uniqKey="Chen W" first="Wei" last="Chen">Wei Chen</name>
<name sortKey="Du, Changjian" sort="Du, Changjian" uniqKey="Du C" first="Changjian" last="Du">Changjian Du</name>
<name sortKey="Ji, Jing" sort="Ji, Jing" uniqKey="Ji J" first="Jing" last="Ji">Jing Ji</name>
<name sortKey="Jiang, Zeping" sort="Jiang, Zeping" uniqKey="Jiang Z" first="Zeping" last="Jiang">Zeping Jiang</name>
<name sortKey="Jiang, Zeping" sort="Jiang, Zeping" uniqKey="Jiang Z" first="Zeping" last="Jiang">Zeping Jiang</name>
<name sortKey="Shi, Shengqing" sort="Shi, Shengqing" uniqKey="Shi S" first="Shengqing" last="Shi">Shengqing Shi</name>
<name sortKey="Xie, Tiantian" sort="Xie, Tiantian" uniqKey="Xie T" first="Tiantian" last="Xie">Tiantian Xie</name>
</country>
</tree>
</affiliations>
</record>

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