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    Variation for N Uptake System in Maize: Genotypic Response to N Supply

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    Author
    Garnett, T; Plett, D; Conn, V; Conn, S; Rabie, H; Rafalski, JA; Dhugga, K; Tester, MA; Kaiser, BN
    Date
    2015-11-09
    Source Title
    Frontiers in Plant Science
    Publisher
    FRONTIERS MEDIA SA
    University of Melbourne Author/s
    Plett, Darren
    Affiliation
    Agriculture and Food Systems
    Metadata
    Show full item record
    Document Type
    Journal Article
    Citations
    Garnett, T., Plett, D., Conn, V., Conn, S., Rabie, H., Rafalski, J. A., Dhugga, K., Tester, M. A. & Kaiser, B. N. (2015). Variation for N Uptake System in Maize: Genotypic Response to N Supply. FRONTIERS IN PLANT SCIENCE, 6 (NOVEMBER), https://doi.org/10.3389/fpls.2015.00936.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/255345
    DOI
    10.3389/fpls.2015.00936
    Abstract
    An understanding of the adaptations made by plants in their nitrogen (N) uptake systems in response to reduced N supply is important to the development of cereals with enhanced N uptake efficiency (NUpE). Twenty seven diverse genotypes of maize (Zea mays, L.) were grown in hydroponics for 3 weeks with limiting or adequate N supply. Genotypic response to N was assessed on the basis of biomass characteristics and the activities of the nitrate ([Formula: see text]) and ammonium ([Formula: see text]) high-affinity transport systems. Genotypes differed greatly for the ability to maintain biomass with reduced N. Although, the N response in underlying biomass and N transport related characteristics was less than that for biomass, there were clear relationships, most importantly, lines that maintained biomass at reduced N maintained net N uptake with no change in size of the root relative to the shoot. The root uptake capacity for both [Formula: see text] and [Formula: see text] increased with reduced N. Transcript levels of putative [Formula: see text] and [Formula: see text] transporter genes in the root tissue of a subset of the genotypes revealed that predominately ZmNRT2 transcript levels responded to N treatments. The correlation between the ratio of transcripts of ZmNRT2.2 between the two N levels and a genotype's ability to maintain biomass with reduced N suggests a role for these transporters in enhancing NUpE. The observed variation in the ability to capture N at low N provides scope for both improving NUpE in maize and also to better understand the N uptake system in cereals.

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