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- Title
Nitrogen and genotype effects on root growth and root survivorship of spring wheat.
- Authors
Herrera, Juan M.; Noulas, Christos; Feil, Boy; Stamp, Peter; Liedgens, Markus
- Abstract
The nitrogen (N) fertilization of wheat ( Triticum aestivum L.) is important for stable and high grain yield. However, the effect of N on root growth and survivorship is poorly understood. The objectives of this study were (1) to determine the effect of varying N availability on the growth and survivorship of roots and (2) to determine whether genotypic variation in N-related traits are linked to root growth and survivorship. In a two-year study, two spring wheat cultivars (Albis and Toronit) and an experimental line (L94491) were grown under low (20 kg N ha-1) and high N supply (270 kg N ha-1) in lysimeters equipped with minirhizotrons. The genotypes showed significant differences in N-related traits: total shoot N content, grain N yield, N harvest index, and rate of decline in flag-leaf greenness. However, there were relatively weak and inconsistent genotypic effects on the time course of root density, root growth during grain filling, and root survivorship. The level of N supply was the factor that most influenced the establishment, growth, and survivorship of roots; the high N supply, depending on the year and genotype, increased growth and survivorship of roots from 0% to 68% and 24% to 34%, respectively.
- Subjects
WHEAT; MINIRHIZOTRONS; NITROGEN fertilizers; NITROGEN &; the environment; ROOT growth
- Publication
Journal of Plant Nutrition & Soil Science, 2013, Vol 176, Issue 4, p561
- ISSN
1436-8730
- Publication type
Article
- DOI
10.1002/jpln.201100334