The response of the maize nitrate transport system to nitrogen demand and supply across the lifecycle

The response of the maize nitrate transport system to nitrogen demand and supply across the lifecycle

© 2013 The Authors. New Phytologist © 2013 New Phytologist Trust.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 198(2013), 1 vom: 13. Apr., Seite 82-94
1. Verfasser: Garnett, Trevor (VerfasserIn)
Weitere Verfasser: Conn, Vanessa, Plett, Darren, Conn, Simon, Zanghellini, Juergen, Mackenzie, Nenah, Enju, Akiko, Francis, Karen, Holtham, Luke, Roessner, Ute, Boughton, Berin, Bacic, Antony, Shirley, Neil, Rafalski, Antoni, Dhugga, Kanwarpal, Tester, Mark, Kaiser, Brent N
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2013
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Amino Acids Anion Transport Proteins Nitrate Transporters Nitrates Plant Proteins RNA, Messenger Nitrogen N762921K75
Beschreibung
Zusammenfassung:© 2013 The Authors. New Phytologist © 2013 New Phytologist Trust.
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 (NRTs) 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 NRTs (predominantly ZmNRT2.1 and ZmNRT2.2) 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 NRTs, 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
Beschreibung:Date Completed 07.08.2013
Date Revised 17.03.2022
published: Print-Electronic
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.12166