Journal article
The response of the maize nitrate transport system to nitrogen demand and supply across the lifecycle
New Phytologist, Vol.198(1), pp.82-94
2013
Abstract
An understanding of nitrate (NO3) uptake throughout the lifecycle of plants, and how this process responds to nitrogen (N) availability, is an important step towards the development of plants with improved nitrogen use efficiency (NUE).
NO3 uptake capacity and transcript levels of putative high‐ and low‐affinity NO3 transporters (NRT s) were profiled across the lifecycle of dwarf maize (Zea mays ) plants grown at reduced and adequate NO3.
Plants showed major changes in high‐affinity NO3 uptake capacity across the lifecycle, which varied with changing relative growth rates of roots and shoots. Transcript abundances of putative high‐affinity NRT s (predominantly ZmNRT 2.1 and ZmNRT 2.2 ) were correlated with two distinct peaks in high‐affinity root NO3 uptake capacity and also N availability. The reduction in NO3 supply during the lifecycle led to a dramatic increase in NO3 uptake capacity, which preceded changes in transcript levels of NRT s, suggesting a model with short‐term post‐translational regulation and longer term transcriptional regulation of NO3 uptake capacity.
These observations offer new insight into the control of NO3 uptake by both plant developmental processes and N availability, and identify key control points that may be targeted by future plant improvement programmes to enhance N uptake relative to availability and/or demand.
Details
- Title
- The response of the maize nitrate transport system to nitrogen demand and supply across the lifecycle
- Authors/Creators
- T. Garnett (Author/Creator) - Australian Centre for Plant Functional GenomicsV. Conn (Author/Creator) - Australian Centre for Plant Functional GenomicsD. Plett (Author/Creator) - Australian Centre for Plant Functional GenomicsS. Conn (Author/Creator) - Australian Centre for Plant Functional GenomicsJ. Zanghellini (Author/Creator) - Australian Centre for Plant Functional GenomicsN. Mackenzie (Author/Creator) - Australian Centre for Plant Functional GenomicsA. Enju (Author/Creator) - Australian Centre for Plant Functional GenomicsK. Francis (Author/Creator) - Australian Centre for Plant Functional GenomicsL. Holtham (Author/Creator) - Australian Centre for Plant Functional GenomicsU. Roessner (Author/Creator) - The University of MelbourneB. Boughton (Author/Creator) - Australian Centre for Plant Functional GenomicsA. Bacic (Author/Creator) - The University of MelbourneN. Shirley (Author/Creator) - Australian Centre for Plant Functional GenomicsA. Rafalski (Author/Creator) - Wilmington UniversityK. Dhugga (Author/Creator) - Pioneer Hi-BredM. Tester (Author/Creator) - Australian Centre for Plant Functional GenomicsB.N. Kaiser (Author/Creator) - The University of Adelaide
- Publication Details
- New Phytologist, Vol.198(1), pp.82-94
- Publisher
- Wiley-Blackwell
- Identifiers
- 991005542504507891
- Copyright
- © 2013 The Authors. New Phytologist © 2013 New Phytologist Trust
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Industry collaboration
- Domestic collaboration
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.4 Crop Science
- 3.4.1637 Plant Nitrogen Metabolism
- Web Of Science research areas
- Plant Sciences
- ESI research areas
- Plant & Animal Science