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Ethylene upregulates auxin biosynthesis in Arabidopsis seedlings to enhance inhibition of root cell elongation
被引:461
作者:
Swarup, Ranjan
Perry, Paula
Hagenbeek, Dik
Van Der Straeten, Dominique
Beemster, Gerrit T. S.
Sandberg, Goran
Bhalerao, Rishikesh
Ljung, Karin
Bennett, Malcolm J.
[1
]
机构:
[1] Univ Nottingham, Sch Biosci, Loughborough LE12 5RD, Leics, England
[2] Univ Nottingham, Ctr Plant Integrat Biol, Loughborough LE12 5RD, Leics, England
[3] Univ Ghent VIB, Dept Plant Syst Biol, B-9052 Ghent, Belgium
[4] Univ Ghent, Dept Mol Genet, B-9052 Ghent, Belgium
[5] Univ Ghent, Plant Hormone Signaling & Bioimaging, Dept Mol Genet, B-9000 Ghent, Belgium
[6] Umea Univ, Umea Plant Sci Ctr, Dept Plant Physiol, SE-90187 Umea, Sweden
[7] Umea Plant Sci Ctr, Dept Forest Genet & Plant Physiol, SE-90183 Umea, Sweden
来源:
基金:
英国生物技术与生命科学研究理事会;
关键词:
RESPONSE PATHWAY;
INSENSITIVE MUTANTS;
POSITIVE REGULATOR;
TRANSPORT;
GROWTH;
GENE;
LOCALIZATION;
GRAVITROPISM;
THALIANA;
ACCELERATION;
D O I:
10.1105/tpc.107.052100
中图分类号:
Q5 [生物化学];
Q7 [分子生物学];
学科分类号:
071010 ;
081704 ;
摘要:
Ethylene represents an important regulatory signal for root development. Genetic studies in Arabidopsis thaliana have demonstrated that ethylene inhibition of root growth involves another hormone signal, auxin. This study investigated why auxin was required by ethylene to regulate root growth. We initially observed that ethylene positively controls auxin biosynthesis in the root apex. We subsequently demonstrated that ethylene-regulated root growth is dependent on ( 1) the transport of auxin from the root apex via the lateral root cap and ( 2) auxin responses occurring in multiple elongation zone tissues. Detailed growth studies revealed that the ability of the ethylene precursor 1-aminocyclopropane-1-carboxylic acid to inhibit root cell elongation was significantly enhanced in the presence of auxin. We conclude that by upregulating auxin biosynthesis, ethylene facilitates its ability to inhibit root cell expansion.
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页码:2186 / 2196
页数:11
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