Is crop N demand more closely related to dry matter accumulation or leaf area expansion during vegetative growth?

Lemaire, G.; Oosterom, Erik van; Sheehy, J. E.; Jeuffroy, M. H.; Massignam, Ângelo Mendes; Rossato, Laurence

doi:10.1016/j.fcr.2006.05.009

Cited by 230 publications

(145 citation statements)

References 52 publications

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“…The critical nitrogen dilution curve obtained here defines the critical shoot N concentration (Nc) for optimal shoot growth (DW) in isolated plant as follows: N c =4.756 DW −0.088 (R 2 =0.93). The "dilution coefficient" of −0.088 is very close to curves already calculated for other isolated C3 plants, within the range of −0.08 to −0.10 ( Lemaire et al 2007). As for other C3 crops (Lemaire et al 2007), the dilution coefficient obtained in isolated plants is higher that calculated for dense crops (−0.32 for pea; Ney et al 1997).…”

Section: 2supporting

confidence: 58%

“…The "dilution coefficient" of −0.088 is very close to curves already calculated for other isolated C3 plants, within the range of −0.08 to −0.10 ( Lemaire et al 2007). As for other C3 crops (Lemaire et al 2007), the dilution coefficient obtained in isolated plants is higher that calculated for dense crops (−0.32 for pea; Ney et al 1997). This indicates that in isolated plants, plant N concentration declines more slowly with plant mass compared to dense crop.…”

Section: 2supporting

confidence: 58%

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Pea nodule gradients explain N nutrition and limited symbiotic fixation in hypernodulating mutants

Voisin

Prudent

Duc

et al. 2015

Agron. Sustain. Dev.

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Legumes fix atmospheric nitrogen by symbiosis with soil bacteria in root nodules. Legume yields are limited by the low capacity of N 2 fixation. Hypernodulating mutants have been selected decades ago to try to increase nodule number. However, literature data show that N fixation of hypernodulating mutants was not increased compared to parental lines. Here, we study the functional basis of limited N fixation associated to hypernodulation. We grew two wild type genotypes and nine hypernodulating mutants of pea in hydroponics in three greenhouse experiments. We measured the following traits related to N nutrition during the vegetative period: nodule number, plant N uptake, nodule-specific activity, and plant and nodule concentrations. Genetic and environmental variations induced nodule gradients. These gradients were used to set quantitative relationships between N nutrition traits and nodule number. We compared the relationships obtained for hypernodulating and for wild types. N nutrition traits were analysed together with C nutrition traits, through correlation networks. Our results show that higher nodule number of hypernodulating mutants is correlated with lower levels of nodule activity, from −25 to −60 %, by comparison to the wild type. Higher nodule number of hypernodulating mutants is also correlated with lower total N uptake by symbiotic fixation, from −0 to −60 %, by comparison to the wild type. Findings demonstrate that N nutrition is not a factor limiting growth in hypernodulating mutants, as shown by N nutrition index higher than 1, indicating N nutrition in excess. The correlations suggest that limited N 2 fixation in hypernodulating mutants arises from restricted shoot growth, which limits the plant capacity to accumulate N. Furthermore, symbiotic efficiency decreased with increasing nodule number, down to a minimal value for hypernodulating mutants. Thus, to overcome the trade-off between N benefits from N 2 fixation and carbon nodulation costs, the hypernodulation trait should be associated with high shoot growth capacity in breeding programs.

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Section: 2supporting

confidence: 58%

Section: 2supporting

confidence: 58%

Pea nodule gradients explain N nutrition and limited symbiotic fixation in hypernodulating mutants

Voisin

Prudent

Duc

et al. 2015

Agron. Sustain. Dev.

View full text Add to dashboard Cite

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“…Plant N uptake is co-regulated by soil N supply and shoot growth, as concluded by Lemaire et al (2007) based on studies under different environments (temperate and subtropical) with various crop species (C 3 and C 4 ). The relationship between N uptake and biomass accumulation reflects the feed-back regulation of N absorption capacity of roots by shoot growth itself under non-limiting N supply.…”

Section: Nitrogen Dynamics At the Plant Levelmentioning

confidence: 99%

“…In many crops, N uptake is related with the accumulation of biomass and growth of leaf area over time (Booij et al 1996;Lemaire et al 2007). In case of N shortage, the actual uptake will fall short of N demand, and the concentration of N in the leaves will decrease more rapidly than in a well-fertilized crop.…”

Section: Introductionmentioning

confidence: 99%

“…The trend in N dilution with increasing biomass can be represented by a power relationship (Flenet et al 2006). The N dilution curve can be used to diagnose N deficiency, to manage N fertilization and for modeling N allocation (Lemaire et al 2007). N dilution curves have been widely studied for monocrops but not for crops in intercropping systems.…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen economy in relay intercropping systems of wheat and cotton

et al. 2007

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The Utilization of Nitrogen by Plants: A Whole Plant Perspective

Pilbeam

2018

Annual Plant Reviews Online

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The growth of whole plants is dependent on tissue N concentration. Plants that grow in N‐rich environments have higher internal N concentrations and a higher relative growth rate, as described by the N productivity concept. When supply of nitrate N is interrupted, growth is maintained from storage pools of unassimilated nitrate for a limited time. Plants with low N supply show low shoot growth, high root–shoot ratio and decreased leaf growth. N is allocated more to the uppermost leaves, where there is a higher requirement for photosynthetic enzymes and chlorophyll, and mobilized to seeds as the leaves senesce. In actively photosynthesizing leaves, N‐containing primary metabolites are present in relatively constant concentrations, although concentrations of N‐containing secondary metabolites are more variable. The acquisition of nitrate is largely dependent on mass flow across the soil, but acquisition of ammonium depends more on diffusion to the roots. In a crop, uptake over a growing season is regulated by plant demand. This demand is signalled from the shoots to the roots. Some adaptations of roots enable the acquisition of nitrogen before it is acquired by other plants, and species adapted to N‐rich soils have high leaf N concentrations and high specific leaf area, and out‐compete other species for light. Those plants with higher leaf N concentrations seem to be more susceptible to herbivory and attack by micro‐organisms, however.

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Is crop N demand more closely related to dry matter accumulation or leaf area expansion during vegetative growth?

Cited by 230 publications

References 52 publications

Pea nodule gradients explain N nutrition and limited symbiotic fixation in hypernodulating mutants

Pea nodule gradients explain N nutrition and limited symbiotic fixation in hypernodulating mutants

Nitrogen economy in relay intercropping systems of wheat and cotton

The Utilization of Nitrogen by Plants: A Whole Plant Perspective

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