Journal Article

Effects of molybdenum deficiency and defects in molybdate transporter MOT1 on transcript accumulation and nitrogen/sulphur metabolism in <i>Arabidopsis thaliana</i>

Yoko Ide, Miyako Kusano, Akira Oikawa, Atsushi Fukushima, Hajime Tomatsu, Kazuki Saito, Masami Yokota Hirai and Toru Fujiwara

in Journal of Experimental Botany

Published on behalf of Society for Experimental Biology

Volume 62, issue 4, pages 1483-1497
Published in print February 2011 | ISSN: 0022-0957
Published online December 2010 | e-ISSN: 1460-2431 | DOI: https://dx.doi.org/10.1093/jxb/erq345
Effects of molybdenum deficiency and defects in molybdate transporter MOT1 on transcript accumulation and nitrogen/sulphur metabolism in Arabidopsis thaliana

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Molybdenum (Mo) is a micronutrient essential for plant growth, as several key enzymes of plant metabolic pathways contain Mo cofactor in their catalytic centres. Mo-containing oxidoreductases include nitrate reductase, sulphite oxidase, xanthine dehydrogenase, and aldehyde oxidase. These are involved in nitrate assimilation, sulphite detoxification, purine metabolism or the synthesis of abscisic acid, auxin and glucosinolates in plants. To understand the effects of Mo deficiency and a mutation in a molybdate transporter, MOT1, on nitrogen and sulphur metabolism in Arabidopsis thaliana, transcript and metabolite profiling of the mutant lacking MOT1 was conducted in the presence or absence of Mo. Transcriptome analysis revealed that Mo deficiency had impacts on genes involved in metabolisms, transport, stress responses, and signal transductions. The transcript level of a nitrate reductase NR1 was highly induced under Mo deficiency in mot1-1. The metabolite profiles were analysed further by using gas chromatography time-of-flight mass spectrometry, capillary electrophoresis time-of-flight mass spectrometry, and ultra high performance liquid chromatography. The levels of amino acids, sugars, organic acids, and purine metabolites were altered significantly in the Mo-deficient plants. These results are the first investigation of the global effect of Mo nutrition and MOT1 on plant gene expressions and metabolism.

Keywords: Metabolome; molybdate transporter; molybdenum deficiency; MOT1; nitrate reductase; transcriptome

Journal Article.  7147 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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