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- Title
Allometric analysis reveals relatively little variation in nitrogen versus biomass accrual in four plant species exposed to varying light, nutrients, water and CO<sub>2</sub>.
- Authors
BERNACCHI, CARL J.; THOMPSON, JENNIFER N.; COLEMAN, JAMES S.; MCCONNAUGHAY, KELLY D. M.
- Abstract
Nitrogen concentrations in plant tissues can vary as a function of resource availability. Altered rates of plant growth and development under varying resource availabilities were examined to determine their effects on changes in whole-plant N use efficiency (NUE). Three species of old-field annuals were grown at broadly varying light, nutrient and water levels, and four species at varying atmospheric concentrations of CO2. Study results show highly variable N accrual rates when expressed as a function of plant age or size, but similar patterns of whole-plant N versus non-N biomass accrual over a wide range of environmental conditions. However, severely light-limited plants showed increased N versus biomass accrual for two of three species, and severely nutrient-limited plants had decreased N versus biomass accrual for all species. Whole-plant N accrual versus age and N versus biomass accrual increased under saturating water for two of three species. A marginally significant, modest decrease in N versus biomass accrual was found at high CO2 levels for two of four species. Physiological adjustments in NUE, expressed as N versus biomass accrual, were limited to environments with severely limited or overabundant resources.
- Subjects
PLANT cells &; tissues; PLANT species; PLANT growth; BIOMASS; ALLOMETRY in plants; NITROGEN
- Publication
Plant, Cell & Environment, 2007, Vol 30, Issue 10, p1216
- ISSN
0140-7791
- Publication type
Article
- DOI
10.1111/j.1365-3040.2007.01698.x