Environmental Control of Root Exudation of Low-Molecular Weight Organic Acids in Tropical Rainforests

Aoki, Maya; Fujii, Kazumichi; Kitayama, Kanehiro

doi:10.1007/s10021-012-9575-6

Cited by 88 publications

(78 citation statements)

References 42 publications

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“…Vicca et al (2012) showed no difference in GPP between forests on fertile and infertile soils, and no evidence for differences in the NPP / GPP ratio, but a very large difference in biomass growth, suggesting that the key difference lies in the allocation of NPP to supporting root symbionts that assist trees in acquiring nutrients under conditions of low nutrient availability. This finding is consistent with that of Aoki et al (2012), who measured, with results that were many times greater, exudation of organic acids from tropical trees on soils with low P availability, relative to more fertile soils in the same climate. The effect apparently extends to wholeecosystem carbon uptake, which was shown by Fernández-Martínez et al (2014) to be determined by nutrient availability to a far greater extent than GPP.…”

Section: [Co 2 ] and Nutrient Supply Effectssupporting

confidence: 92%

Biophsyical constraints on gross primary production by the terrestrial biosphere

2014

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Abstract. Persistent divergences among the predictions of complex carbon-cycle models include differences in the sign as well as the magnitude of the response of global terrestrial primary production to climate change. Such problems with current models indicate an urgent need to reassess the principles underlying the environmental controls of primary production. The global patterns of annual and maximum monthly terrestrial gross primary production (GPP) by C 3 plants are explored here using a simple first-principles model based on the light-use efficiency formalism and the Farquhar model for C 3 photosynthesis. The model is driven by incident photosynthetically active radiation (PAR) and remotely sensed green-vegetation cover, with additional constraints imposed by low-temperature inhibition and CO 2 limitation. The ratio of leaf-internal to ambient CO 2 concentration in the model responds to growing-season mean temperature, atmospheric dryness (indexed by the cumulative water deficit, E) and elevation, based on an optimality theory. The greatest annual GPP is predicted for tropical moist forests, but the maximum (summer) monthly GPP can be as high, or higher, in boreal or temperate forests. These findings are supported by a new analysis of CO 2 flux measurements. The explanation is simply based on the seasonal and latitudinal distribution of PAR combined with the physiology of photosynthesis. By successively imposing biophysical constraints, it is shown that partial vegetation cover -driven primarily by water shortage -represents the largest constraint on global GPP.

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Section: [Co 2 ] and Nutrient Supply Effectssupporting

confidence: 92%

Biophsyical constraints on gross primary production by the terrestrial biosphere

2014

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“…The estimates above are in general agreement with Aoki et al (2012), who showed that species of Myrtaceae, represented by the genera Syzygium and Tristaniopsis, had exuded large amounts of C in the form of organic acids, i.e. c. 16.6 % of shoot mass.…”

supporting

confidence: 78%

“…As far as a typical Eucalyptus plantation is concerned, the only approximation we have at an ecosystem scale is the study of Aoki et al (2012), who studied soils with low levels of P and with range of species, among them the Myrtaceae. The estimates above are in general agreement with Aoki et al (2012), who showed that species of Myrtaceae, represented by the genera Syzygium and Tristaniopsis, had exuded large amounts of C in the form of organic acids, i.e.…”

mentioning

confidence: 99%

Modeling rhizosphere carbon and nitrogen cycling in Eucalyptus plantation soil

Valadares¹,

Neves²,

Costa³

et al. 2017

Preprint

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Abstract. Vigorous Eucalyptus plantations produce 105 to 10 6 km ha -1 of fine roots that probably increase carbon (C) and nitrogen (N) cycling in rhizosphere soil. However, the quantitative importance of rhizosphere priming is still unknown for most ecosystems, for instance Eucalyptus plantations. Therefore, the objective of this work was to propose and evaluate a mechanistic model for predicting rhizospheric C and N cycling in Eucalyptus plantations. The potential importance of the priming effect was estimated for a typical Eucalyptus plantation in Brazil. The process-based model (ForPRAN -Forest 15 plantation rhizospheric available nitrogen) predicts the change in rhizosphere C and N cycling resulting from root growth and consists of two modules: (1) fine root growth, and (2) C and N rhizosphere cycling. The model describes a series of soil biological processes: root growth, rhizodeposition, microbial uptake, enzymatic synthesis, depolymerization of soil organic matter, respiration, mineralization, immobilization, microbial death, microbial emigration and immigration, SOM formation.Model performance was satisfactory quantitatively and qualitatively when compared to observed data in the literature. The 20 input variables that most influenced N gain by rhizospheric mineralization were (in order of decreasing importance): root diameter > rhizosphere thickness > soil temperature > clay content. The priming effect in a typical Eucalyptus plantation producing 42 m³/ha/year of wood, with assumed losses of 40 % of the total N mineralized, was estimated to be 24.6 % of plantation N demand (shoot + roots + litter). The rhizosphere cycling model should be considered for adaptation to other forestry and agricultural production models where the inclusion of such processes offer the potential for improved model 25 performance.

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“…24,25 Nutrient availability also alters exudate production and composition with the potential to impact both interorganismal interactions as well as nutrient uptake. [26][27][28][29] For example, in Sorghum bicolor reduced nitrogen and phosphorus levels promote the release of 5-deoxystrigol which encourages the recruitment of mycorrhizal fungi. 26 Clearly, plants must integrate information regarding both neighbor identity as well as nutrient availability if they are to successfully compete in the environment.…”

Section: Introductionmentioning

confidence: 99%

“…[22][23][24][25][26][27][28][29] Based on these prior observations we hypothesized that A. thaliana may utilize information regarding nutrient availability to influence decisions regarding competition based on neighbor identity. In other words, nutrient availability may influence the production of specific exudates associated with KR which could alter the RSA accordingly.…”

Section: Introductionmentioning

confidence: 99%

Kin recognition is a nutrient-dependent inducible phenomenon

Palmer

Ali

Yang

et al. 2016

Plant Signaling & Behavior

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Recognition and response to prospective competitors are crucial variables that must be considered in resource distribution and utilization in plant communities. Associated behaviors are largely mediated through the exchange of low-molecular weight exudates. These cues can significantly alter the root system architecture (RSA) between neighboring plants and are routinely sensitive enough to distinguish between plants of the same or different accessions, a phenomenon known as kin recognition (KR). Such refined discrimination of identity, based on the composition and detection of patterns of exudate signals is remarkable and provides insight into the chemical ecology of plant-plant interactions. The discovery that KR occurs in Arabidopsis thaliana provides a model system to resolve many of the mechanistic questions associated with this process. We hypothesized that the low-molecular weight cues which direct changes to the RSA during KR was driven by nutrient availability. Here we present evidence in support of a nutrient-inducible model for KR. Our findings underscore how exudate production and detection are influenced by nutrient availability as well as how this information is integrated into 'decisions' about competition and root system architecture which may have broader impacts on community composition.

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Environmental Control of Root Exudation of Low-Molecular Weight Organic Acids in Tropical Rainforests

Cited by 88 publications

References 42 publications

Biophsyical constraints on gross primary production by the terrestrial biosphere

Biophsyical constraints on gross primary production by the terrestrial biosphere

Modeling rhizosphere carbon and nitrogen cycling in Eucalyptus plantation soil

Kin recognition is a nutrient-dependent inducible phenomenon

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