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- W2129677668 abstract "We examined changes in dry weight and leaf area within Dactylis glomerata L. plants using allometric analysis to determine whether observed patterns were truly affected by [CO 2 ] and N supply or merely reflect ontogenetic drift. Plants were grown hydroponically at four concentrations of ({hbox{ NO }}_{3}^{-}) in controlled environment cabinets at ambient (360 μl l −1 ) or elevated (680 μl l −1 ) atmospheric [CO 2 ]. Both CO 2 and N enrichment stimulated net dry matter production. Allometric analyses revealed that [CO 2 ] did not affect partitioning of dry matter between shoot and root at high N supply. However, at low N supply there was a transient increase in dry matter partitioning into the shoot at elevated compared to ambient [CO 2 ] during early stages of growth, which is inconsistent with predictions based on optimal partitioning theory. In contrast, dry matter partitioning was affected by N supply throughout ontogeny, such that at low N supply dry matter was preferentially allocated to roots, which is in agreement with optimal partitioning theory. Independent of N supply, atmospheric CO 2 enrichment resulted in a reduction in leaf area ratio (LAR), solely due to a decrease in specific leaf area (SLA), when plants of the same age were compared. However, [CO 2 ] did not affect allometric coefficients relating dry weight and leaf area, and effects of elevated [CO 2 ] on LAR and SLA were the result of an early, transient stimulation of whole plant and leaf dry weight, compared to leaf area production. We conclude that elevated [CO 2 ], in contrast to N supply, changes allocation patterns only transiently during early stages of growth, if at all. Copyright 2000 Annals of Botany Company" @default.
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- W2129677668 date "2000-10-01" @default.
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- W2129677668 title "Is Partitioning of Dry Weight and Leaf Area Within Dactylis glomerata Affected by N and CO2Enrichment?" @default.
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- W2129677668 doi "https://doi.org/10.1006/anbo.2000.1243" @default.
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