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Genotypic Difference in Nitrogen Acquisition Ability in Maize Plants Is Related to the Coordination of Leaf and Root Growth
- Source :
- Journal of Plant Nutrition. 29:317-330
- Publication Year :
- 2006
- Publisher :
- Informa UK Limited, 2006.
-
Abstract
- The capacity of a plant to take up nitrate is a function of the activity of its nitrate-transporter systems and the size and architecture of its root system. It is unclear which of the two components, root system or nitrate-uptake system, is more important in nitrogen (N) acquisition under nitrogen-sufficiency conditions. Two maize (Zea mays L.) inbred lines (478 and Wu312) grown in nutrient solution in a controlled environment were compared for their N acquisition at 0.1, 0.5, 2.5, 5, and 10 mmol L−1 nitrate supply. Genotype 478 could take up more N than Wu312 at all nitrate concentrations, though the shoot biomass of the two genotypes was similar. Genotype 478 had a larger leaf area and longer root length. The specific N uptake rate of 478 (μmol N g−1 root. d−1) was lower than that of Wu312. In an independent nitrate-depletion experiment, the potential nitrate uptake rate of 478 was also lower than that of Wu312. No genotypic difference was found in photosynthesis rate. It was concluded that th...
Details
- ISSN :
- 15324087 and 01904167
- Volume :
- 29
- Database :
- OpenAIRE
- Journal :
- Journal of Plant Nutrition
- Accession number :
- edsair.doi...........96f9491fdf55f8fa75400f4f5fbf2e51