Plant and Cell Physiology Advance Access originally published online on April 15, 2009
Plant and Cell Physiology 2009 50(7):1201-1214; doi:10.1093/pcp/pcp057
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This article appears in the following Plant and Cell Physiology issue: Special Issue Articles: Omics and Bioinformatics [View the issue table of contents]
Special Issue - Regular Paper |
Highly Sensitive and High-Throughput Analysis of Plant Hormones Using MS-Probe Modification and Liquid Chromatography–Tandem Mass Spectrometry: An Application for Hormone Profiling in Oryza sativa
1RIKEN Plant Science Center, 1-7-22, Suehiro, Tsurumi, Yokohama, 230-0045 Japan
2Faculty of Science and Technology, Keio University, Kohoku, Yokohama, 223-8522 Japan
3Graduate School of Agricultural Science, Kobe University, Rokkodai, Nada, Kobe, 657-8501 Japan
4Bioscience and Biotechnology Center, Nagoya University, Nagoya, 464-8601 Japan
*Corresponding author: E-mail, sakaki{at}riken.jp; Fax, +81-45-503-9609.
| Abstract |
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We have developed a highly sensitive and high-throughput method for the simultaneous analysis of 43 molecular species of cytokinins, auxins, ABA and gibberellins. This method consists of an automatic liquid handling system for solid phase extraction and ultra-performance liquid chromatography (UPLC) coupled with a tandem quadrupole mass spectrometer (qMS/MS) equipped with an electrospray interface (ESI; UPLC-ESI-qMS/MS). In order to improve the detection limit of negatively charged compounds, such as gibberellins, we chemically derivatized fractions containing auxin, ABA and gibberellins with bromocholine that has a quaternary ammonium functional group. This modification, that we call MS-probe, makes these hormone derivatives have a positive ion charge and permits all compounds to be measured in the positive ion mode with UPLC-ESI-qMS/MS in a single run. Consequently, quantification limits of gibberellins increased up to 50-fold. Our current method needs <100 mg (FW) of plant tissues to determine phytohormone profiles and enables us to analyze >180 plant samples simultaneously. Application of this method to plant hormone profiling enabled us to draw organ distribution maps of hormone species in rice and also to identify interactions among the four major hormones in the rice gibberellin signaling mutants, gid1-3, gid2-1 and slr1. Combining the results of hormone profiling data with transcriptome data in the gibberellin signaling mutants allows us to analyze relationships between changes in gene expression and hormone metabolism.
Keywords: ABA - Auxins - Cytokinins - Gibberellins - Mass spectrometry - Oryza sativa
Abbreviations:
AAO, aldehyde oxidase; ASA, anthranilate synthase
subunit; ASB, anthranilate synthase β subunit; CKX, cytokinin oxidase/dehydrogenase; cZ, cis-zeatin; DZ, dihydrozeatin; DZR, DZ riboside; ESI, electrospray interface; EUIL, EUI-like; GA2ox, gibberellin 2-oxidase; GA20ox, gibberellin 20-oxidase; IA-Ala, indole-3-acetyl-L-alanine; IA-Asp, indole-3-acetyl-L-aspartic acid; IA-Ile, indole-3-acetyl-L-isoleucine; IA-Leu, indole-3-acetyl-L-leucine; IA-Phe, indole-3-acetyl-L-phenylalanine; iP, N6-(
2-isopentenyl)adenine; iP7G, iP-7-N-glucoside; iP9G, iP-9-N-glucoside; iPR, iP riboside; iPRMP, iPR 5'-monophosphate; iPRDP, iPR 5'-diphosphate; iPRTP, iPR 5'-triphosphate; iPRPs, iPR 5'-phosphates; KAO, ent-kaurenoic acid oxidase; KO, ent-kaurene oxidase; LOG, lonely guy; NCED, 9-cis-epoxycarotenoid dioxygenase; NIT, nitrilase; qMS/MS, tandem quadrupole mass spectrometer; TAA, tryptophan aminotransferase; tZ, trans-zeatin; tZ7G, tZ-7-N-glucoside; tZ9G, tZ-9-N-glucoside; tZOG, tZ-O-glucoside; tZR, tZ riboside; tZROG, tZR-O-glucoside; tZRMP, tZR 5'-monophosphate; tZRPs, tZR 5'-phosphates; UPLC, ultra-performance liquid chromatography; ZEP, zeaxanthin epoxidase.
5Present address: Kyoto City Collaboration of Regional Entities for the Advancement of Technological Excellence, Kyoto, 615-8510 Japan.
6Present address: Department of Biology, University of Washington, Seattle, WA 98195, USA.
(Received March 8, 2009; Accepted April 12, 2009)
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