TY  - JOUR
AU  - Garnett, T
AU  - Plett, D
AU  - Conn, V
AU  - Conn, S
AU  - Rabie, H
AU  - Rafalski, JA
AU  - Dhugga, K
AU  - Tester, MA
AU  - Kaiser, BN
Y2  - 2020/12/17
Y1  - 2015/11/09
SN  - 1664-462X
UR  - http://hdl.handle.net/11343/255345
AB  - 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.
LA  - English
PB  - FRONTIERS MEDIA SA
T1  - Variation for N Uptake System in Maize: Genotypic Response to N Supply
DO  - 10.3389/fpls.2015.00936
IS  - Frontiers in Plant Science
VL  - 6
IS  - NOVEMBER
L1  - /bitstream/handle/11343/255345/PMC4637428.pdf?sequence=1&isAllowed=y
ER  -