dc.contributor.author | Garnett, Trevor | |
dc.contributor.author | Plett, Darren | |
dc.contributor.author | Conn, Vanessa | |
dc.contributor.author | Conn, Simon | |
dc.contributor.author | Rabie, Huwaida | |
dc.contributor.author | Rafalski, J Antoni | |
dc.contributor.author | Dhugga, Kanwarpal; | |
dc.contributor.author | Tester, Mark | |
dc.contributor.author | Kaiser, Brent N | |
dc.date.accessioned | 2018-09-22T19:48:56Z | |
dc.date.available | 2018-09-22T19:48:56Z | |
dc.date.issued | 2015 | |
dc.identifier.uri | http://dspace.bethlehem.edu:8080/xmlui/handle/123456789/76 | |
dc.description.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 (NO−3) and ammonium (NH+4NH+4) 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 NO−3 and NH+4 increased with reduced N. Transcript levels of putative NO−3 and NH+4 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. | en_US |
dc.language.iso | en | en_US |
dc.publisher | Frontiers | en_US |
dc.subject | N, nitrate, ammonium, nitrogen use efficiency, NUE, uptake, Zea mays | en_US |
dc.title | Variation for N uptake system in maize: genotypic response to N supply | en_US |
dc.type | Article | en_US |