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    Genotypic variation in the sulfur assimilation and metabolism of onion (Allium cepa L.) I. Plant composition and transcript accumulation

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    Type
    Article
    Authors
    McCallum, John A.
    Thomas, Ludivine
    Shaw, Martin L.
    Pither-Joyce, Meeghan D.
    Leung, Susanna
    Cumming, Mathew
    McManus, Michael T.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Computational Bioscience Research Center (CBRC)
    Core Labs
    Date
    2011-06
    Permanent link to this record
    http://hdl.handle.net/10754/561786
    
    Metadata
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    Abstract
    Organosulfur compounds are major sinks for assimilated sulfate in onion (Allium cepa L.) and accumulation varies widely due to plant genotype and sulfur nutrition. In order to better characterise sulfur metabolism phenotypes and identify potential control points we compared plant composition and transcript accumulation of the primary sulfur assimilation pathway in the high pungency genotype 'W202A' and the low pungency genotype 'Texas Grano 438' grown hydroponically under S deficient (S-) and S-sufficient (S+) conditions. Accumulation of total S and alk(en)yl cysteine sulfoxide flavour precursors was significantly higher under S+ conditions and in 'W202A' in agreement with previous studies. Leaf sulfate and cysteine levels were significantly higher in 'W202A' and under S+. Glutathione levels were reduced by S- treatment but were not affected by genotype, suggesting that thiol pool sizes are regulated differently in mild and pungent onions. The only significant treatment effect observed on transcript accumulation in leaves was an elevated accumulation of O-acetyl serine thiol-lyase under S-. By contrast, transcript accumulation of all genes in roots was influenced by one or more treatments. APS reductase transcript level was not affected by genotype but was strongly increased by S-. Significant genotype × S treatment effects were observed in a root high affinity-sulfur transporter and ferredoxin-sulfite reductase. ATP sulfurylase transcript levels were significantly higher under S+ and in 'W202A'. © 2011 Elsevier Ltd. All rights reserved.
    Citation
    McCallum, J., Thomas, L., Shaw, M., Pither-Joyce, M., Leung, S., Cumming, M., & McManus, M. T. (2011). Genotypic variation in the sulfur assimilation and metabolism of onion (Allium cepa L.) I. Plant composition and transcript accumulation. Phytochemistry, 72(9), 882–887. doi:10.1016/j.phytochem.2011.03.006
    Publisher
    Elsevier BV
    Journal
    Phytochemistry
    DOI
    10.1016/j.phytochem.2011.03.006
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.phytochem.2011.03.006
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Computational Bioscience Research Center (CBRC)

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