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dc.contributor.authorGarnett, Trevor
dc.contributor.authorPlett, Darren
dc.contributor.authorConn, Vanessa
dc.contributor.authorConn, Simon
dc.contributor.authorRabie, Huwaida
dc.contributor.authorRafalski, J Antoni
dc.contributor.authorDhugga, Kanwarpal;
dc.contributor.authorTester, Mark
dc.contributor.authorKaiser, Brent N
dc.date.accessioned2018-09-22T19:48:56Z
dc.date.available2018-09-22T19:48:56Z
dc.date.issued2015
dc.identifier.urihttp://dspace.bethlehem.edu:8080/xmlui/handle/123456789/76
dc.description.abstractAn 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.isoenen_US
dc.publisherFrontiersen_US
dc.subjectN, nitrate, ammonium, nitrogen use efficiency, NUE, uptake, Zea maysen_US
dc.titleVariation for N uptake system in maize: genotypic response to N supplyen_US
dc.typeArticleen_US


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