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

被引：103

作者：

Garnett, Trevor ^{[1
,2
]}

Conn, Vanessa ^{[1
,2
]}

Plett, Darren ^{[1
,2
]}

Conn, Simon ^{[1
,2
]}

Zanghellini, Juergen ^{[1
,3
]}

Mackenzie, Nenah ^{[1
,2
]}

Enju, Akiko ^{[1
,2
]}

Francis, Karen ^{[1
,2
]}

Holtham, Luke ^{[1
,2
]}

Roessner, Ute ^{[4
,5
]}

Boughton, Berin ^{[4
,5
]}

Bacic, Antony ^{[4
,5
]}

Shirley, Neil ^{[1
,2
]}

Rafalski, Antoni ^{[6
]}

Dhugga, Kanwarpal ^{[7
]}

Tester, Mark ^{[1
,2
]}

Kaiser, Brent N. ^{[2
]}

机构：

[1] Univ Adelaide, Waite Res Inst, Australian Ctr Plant Funct Genom, Adelaide, SA 5064, Australia

[2] Univ Adelaide, Waite Res Inst, Sch Agr Food & Wine, Adelaide, SA 5064, Australia

[3] Austrian Ctr Ind Biotechnol, A-1190 Vienna, Austria

[4] Univ Melbourne, Sch Bot, Australian Ctr Plant Funct Genom, Parkville, Vic 3010, Australia

[5] Univ Melbourne, Metabol Australia Sch Bot, Parkville, Vic 3010, Australia

[6] DuPont Crop Genet, Wilmington, DE 19803 USA

[7] DuPont Pioneer, Agr Biotechnol, Johnston, IA 50131 USA

来源：

NEW PHYTOLOGIST | 2013年 / 198卷 / 01期

基金：

澳大利亚研究理事会;

关键词：

maize; nitrate; nitrogen; nitrogen use efficiency (NUE); uptake; AMINO-ACIDS; ARABIDOPSIS-THALIANA; LOLIUM-PERENNE; ROOT-SYSTEM; GENE FAMILY; NO3-UPTAKE; BARLEY; AMMONIUM; KINETICS; INDUCTION;

D O I：

10.1111/nph.12166

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

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.

引用

页码：82 / 94

页数：13

共 62 条

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