Nitrogen absorption by roots as a cause of interspecific variations in leaf nitrogen concentration and photosynthetic capacity

Osone, Yoko; Tateno, Masaki

doi:10.1111/j.1365-2435.2005.00970.x

Cited by 38 publications

(31 citation statements)

References 35 publications

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“…M3, M4) differed between species and light environments, but each set of constants ( c 1 and c 2 , c 3 and c 4 ) showed high determination coefficients, as reported by Osone and Tateno (2003). The SAR of A. buergerianum was higher than that of M. bombycis , indicating different intrinsic capacities for nitrogen uptake [25], [26].…”

Section: Resultsmentioning

confidence: 97%

Optimal Leaf-to-Root Ratio and Leaf Nitrogen Content Determined by Light and Nitrogen Availabilities

Sugiura

Tateno

2011

PLoS ONE

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Plants exhibit higher leaf-to-root ratios (L/R) and lower leaf nitrogen content (N area) in low-light than in high-light environments, but an ecological significance of this trait has not been explained from a whole-plant perspective. This study aimed to theoretically and experimentally demonstrate whether these observed L/R and N area are explained as optimal biomass allocation that maximize whole-plant relative growth rate (RGR). We developed a model which predicts optimal L/R and N area in response to nitrogen and light availability. In the model, net assimilation rate (NAR) was determined by light-photosynthesis curve, light availability measured during experiments, and leaf temperature affecting the photosynthesis and leaf dark respiration rate in high and low-light environments. Two pioneer trees, Morus bombycis and Acer buergerianum, were grown in various light and nitrogen availabilities in an experimental garden and used for parameterizing and testing the model predictions. They were grouped into four treatment groups (relative photosynthetic photon flux density, RPPFD 100% or 10%×nitrogen-rich or nitrogen-poor conditions) and grown in an experimental garden for 60 to 100 days. The model predicted that optimal L/R is higher and N area is lower in low-light than high-light environments when compared in the same soil nitrogen availability. Observed L/R and N area of the two pioneer trees were close to the predicted optimums. From the model predictions and pot experiments, we conclude that the pioneer trees, M. bombycis and A. buergerianum, regulated L/R and N area to maximize RGR in response to nitrogen and light availability.

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Section: Resultsmentioning

confidence: 97%

Optimal Leaf-to-Root Ratio and Leaf Nitrogen Content Determined by Light and Nitrogen Availabilities

Sugiura

Tateno

2011

PLoS ONE

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“…This also could be confirmed by the increase of Γ in C. yunnanense and C. lichiangense after transplanting. The decrease in P Nmax of C. yunnanense and C. lichiangense after transplanting would be due to the decrease in N absorption ability (Osone and Tateno 2005), while the increase in P Nmax of C. flavum, C. guttatum, and C. tibeticum would be attributable to lack of strong environmental limitation in the nursery where conditions remained constant (Cordell et al 1998). The variation in photosynthesis would reflect the physiological adjustment to the changing environments.…”

Section: Discussionmentioning

confidence: 98%

“…Among the five species, C. lichiangense had the highest LMA, not LNC, while C. guttatum had the lowest LMA with higher LNC. This discrepancy would be largely due to difference in N absorption ability of plants (Osone and Tateno 2005).…”

Section: Discussionmentioning

confidence: 98%

Photosynthetic performances of five Cypripedium species after transplanting

Zhang¹,

Hong²,

Xu³

et al. 2006

Photosynt.

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Photosynthesis and leaf traits of five species in genus Cypripedium were compared in natural habitats and transplant nursery to develop effective strategy for cultivation and conservation. Among five species, C. guttatum had the highest photosynthetic capacity (P Nmax ) in the natural habitat and nursery, while C. lichiangense the lowest. The differences in P Nmax among species were correlated with leaf N content (LNC) and leaf dry mass per unit area (LMA). After transplanting from natural habitats to nursery, the P Nmax of C. lichiangense and C. yunnanense decreased, that of C. guttatum increased, while those of C. flavum and C. tibeticum remained relatively constant. The variations in LNC and biochemical efficiency would be responsible for the differences in P Nmax between plants in natural habitats and in the nursery, but not the relative stomatal limitation. After transplanting, the F v /F m of C. lichiangense and C. yunnanense were declined. Meanwhile, the temperature ranges maintaining 90 % P Nmax of C. lichiangense and C. yunnanense were narrower than those of the other three species. Thus the biochemical process in five species played a major role in the differences of P Nmax after transplanting, and the widespread species had higher photosynthetic adaptability than the narrow-spread species.

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“…Inherent differences in SAR may partly be ascribed to root morphology. In general, roots with higher specific root length have higher SAR (Jackson et al 1990;Eissenstat 1992;Reich et al 1998;Osone and Tateno 2005), but are less resistant to physical disturbance and herbivory (Eissenstat 1992;Ryser 1996;Wells and Eissenstat 2001;van der Krift and Berendse 2002). Thus, there may be a tradeoff between activity and persistence in root traits, and in the leaf traits mentioned above.…”

Section: Nitrogen Allocationmentioning

confidence: 96%

A paradox of leaf-trait convergence: why is leaf nitrogen concentration higher in species with higher photosynthetic capacity?

Hikosaka

Osone

2009

J Plant Res

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It is well known that leaf photosynthesis per unit dry mass (A(mass)) is positively correlated with nitrogen concentration (N(mass)) across naturally growing plants. In this article we show that this relationship is paradoxical because, if other traits are identical among species, plants with a higher A(mass) should have a lower N(mass), because of dilution by the assimilated carbon. To find a factor to overcome the dilution effect, we analyze the N(mass)-A(mass) relationship using simple mathematical models and literature data. We propose two equations derived from plant-growth models. Model prediction is compared with the data set of leaf trait spectrum obtained on a global scale. The model predicts that plants with a higher A(mass) should have a higher specific nitrogen absorption rate in roots (SAR), less biomass allocation to leaves, and/or greater nitrogen allocation to leaves. From the literature survey, SAR is suggested as the most likely factor. If SAR is the sole factor maintaining the positive relationship between N(mass) and A(mass), the variation in SAR is predicted to be much greater than that in A(mass); given that A(mass) varies 130-fold, SAR may vary more than 2000-fold. We predict that there is coordination between leaf and root activities among species on a global scale.

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Nitrogen absorption by roots as a cause of interspecific variations in leaf nitrogen concentration and photosynthetic capacity

Cited by 38 publications

References 35 publications

Optimal Leaf-to-Root Ratio and Leaf Nitrogen Content Determined by Light and Nitrogen Availabilities

Optimal Leaf-to-Root Ratio and Leaf Nitrogen Content Determined by Light and Nitrogen Availabilities

Photosynthetic performances of five Cypripedium species after transplanting

A paradox of leaf-trait convergence: why is leaf nitrogen concentration higher in species with higher photosynthetic capacity?

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