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Auxin biosynthesis in maize.
Plant Biol (Stuttg). 2006 May; 8(3):334-9.PB

Abstract

For the biosynthesis of the phytohormone indole-3-acetic acid (IAA), a number of tryptophan-dependent and -independent pathways have been discussed. Maize is an appropriate model system to analyze IAA biosynthesis particularly because high quantities of IAA conjugates are stored in the endosperm. This allowed precursor feeding experiments in a kernel culture system followed by retrobiosynthetic NMR analysis, which strongly suggested that tryptophan-dependent IAA synthesis is the predominant route for auxin biosynthesis in the maize kernel. Two nitrilases ZmNIT1 and ZmNIT2 are expressed in seeds. ZmNIT2 efficiently hydrolyzes indole-3-acetonitrile (IAN) to IAA and thus could be involved in auxin biosynthesis. Redundant pathways, e.g., via indole-3-acetaldehyde could imply that multiple mutants will be necessary to obtain IAA-deficient plants and to conclusively identify relevant genes for IAA biosynthesis.

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Authors+Show Affiliations

Kriechbaumer V
Lehrstuhl für Genetik, Technische Universität München, Am Hochanger 8, 85350 Freising, Germany.
Park WJ
No affiliation info available
Gierl A
No affiliation info available
Glawischnig E
No affiliation info available

MeSH

AcetonitrilesAminohydrolasesIndoleacetic AcidsPlant Growth RegulatorsTryptophanZea mays

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Review

Language

eng

PubMed ID

16807825

Citation

Kriechbaumer, V, et al. "Auxin Biosynthesis in Maize." Plant Biology (Stuttgart, Germany), vol. 8, no. 3, 2006, pp. 334-9.
Kriechbaumer V, Park WJ, Gierl A, et al. Auxin biosynthesis in maize. Plant Biol (Stuttg). 2006;8(3):334-9.
Kriechbaumer, V., Park, W. J., Gierl, A., & Glawischnig, E. (2006). Auxin biosynthesis in maize. Plant Biology (Stuttgart, Germany), 8(3), 334-9.
Kriechbaumer V, et al. Auxin Biosynthesis in Maize. Plant Biol (Stuttg). 2006;8(3):334-9. PubMed PMID: 16807825.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Auxin biosynthesis in maize. AU - Kriechbaumer,V, AU - Park,W J, AU - Gierl,A, AU - Glawischnig,E, PY - 2006/6/30/pubmed PY - 2006/9/22/medline PY - 2006/6/30/entrez SP - 334 EP - 9 JF - Plant biology (Stuttgart, Germany) JO - Plant Biol (Stuttg) VL - 8 IS - 3 N2 - For the biosynthesis of the phytohormone indole-3-acetic acid (IAA), a number of tryptophan-dependent and -independent pathways have been discussed. Maize is an appropriate model system to analyze IAA biosynthesis particularly because high quantities of IAA conjugates are stored in the endosperm. This allowed precursor feeding experiments in a kernel culture system followed by retrobiosynthetic NMR analysis, which strongly suggested that tryptophan-dependent IAA synthesis is the predominant route for auxin biosynthesis in the maize kernel. Two nitrilases ZmNIT1 and ZmNIT2 are expressed in seeds. ZmNIT2 efficiently hydrolyzes indole-3-acetonitrile (IAN) to IAA and thus could be involved in auxin biosynthesis. Redundant pathways, e.g., via indole-3-acetaldehyde could imply that multiple mutants will be necessary to obtain IAA-deficient plants and to conclusively identify relevant genes for IAA biosynthesis. SN - 1435-8603 UR - https://www.unboundmedicine.com/medline/citation/16807825/Auxin_biosynthesis_in_maize_ L2 - http://www.thieme-connect.com/DOI/DOI?10.1055/s-2006-923883 DB - PRIME DP - Unbound Medicine ER -