Chemistry in its application to agriculture and physiology

Liebig, Justus; Playfair, Lyon; Webster, John White

doi:10.5962/bhl.title.41248

Cited by 116 publications

(125 citation statements)

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“…Within a strictly stoichiometrically conserved system, i.e. where the uptake and cycling of every nutrient always occurs in a fixed ratio, the nutrient which is most deficient might be expected to be the first to become limiting [9]. However, this only happens once microbial uptake has depleted this nutrient.…”

Section: (A) Defining Deficiencymentioning

confidence: 99%

“…However, this only happens once microbial uptake has depleted this nutrient. Moreover, again within a stoichiometrically conserved system, once limitation by the most deficient nutrient develops, the other nutrients would be expected to remain replete [9,25]. However, such arguments can break down once the potential for flexibility in the stoichiometric coupling of different nutrient cycles is acknowledged [11,18,28,33].…”

Section: (A) Defining Deficiencymentioning

confidence: 99%

“…Nutrient deficiency can thus be considered as indicative of the potential for ('Liebig-type' [9]) nutrient limitation to develop [18]. Within a strictly stoichiometrically conserved system, i.e.…”

Section: (A) Defining Deficiencymentioning

confidence: 99%

“…Here previous usage [11,21] will be adopted, whereby limitation refers to a situation where either the (bio-)availability of a given nutrient is limiting for the rate of production of new biomass [8] or the overall supply of a given nutrient is setting a limit on the overall biomass [9]. The significance of any distinction between such so-called 'rate'- [8] or 'yield'-type [9] limitations, respectively, will be explicitly acknowledged where relevant in the context of what follows. However, it is worth noting that the two concepts may frequently be linked [18].…”

Section: (A) Defining Deficiencymentioning

confidence: 99%

“…When combined with the associated carbon fluxes, this cycle of organic matter production, export and remineralization constitutes the biological carbon pump (BCP) [4], which acts to store a large amount of dissolved inorganic carbon in the deep ocean and exerts a major control on atmospheric pCO 2 [5][6][7]. Simultaneously, the availability and supply of a range of nutrients to the upper ocean frequently exerts a fundamental constraint on the rate [8] and/or absolute [9] production of new organic matter in the surface layer [10,11]. Reciprocal interactions between internal oceanic nutrient cycling and upper ocean microbial activity are hence a key driver of global biogeochemical processes [12].…”

Section: Introductionmentioning

confidence: 99%

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Diagnosing oceanic nutrient deficiency

Moore¹

2016

Phil. Trans. R. Soc. A.

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Section: (A) Defining Deficiencymentioning

confidence: 99%

Section: (A) Defining Deficiencymentioning

confidence: 99%

Section: (A) Defining Deficiencymentioning

confidence: 99%

Section: (A) Defining Deficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Diagnosing oceanic nutrient deficiency

Moore¹

2016

Phil. Trans. R. Soc. A.

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Regulation of Redfield ratios in the deep ocean

Auguères

Loreau

2015

Global Biogeochemical Cycles

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Biotic regulation of the environment at global scales has been debated for several decades.An example is the similarity between deep-ocean and phytoplankton mean N:P ratios. N and P cycles are heavily altered by human activities, mainly through an increase in nutrient supply to the upper ocean. As phytoplankton only access nutrients in the upper ocean, it is critical to understand (1) to what extent phytoplankton are able to regulate N and P concentrations as well as their ratio in the deep, inaccessible layer and (2) what mechanisms control the value of the deepwater N:P ratio and the efficiency of its biotic regulation. With a model of N and P cycles in the global ocean separated in two layers, we show that the value of the deepwater N:P ratio is determined by nonfixer's N:P ratio, recycling, and denitrification. Our model predicts that although phytoplankton cannot efficiently regulate deep nutrient pools, they can maintain nearly constant ratios between nutrients because compensatory dynamics between nonfixers and nitrogen fixers allows a control of deepwater chemistry through nutrient recycling. This mechanism could explain the near constancy of the deepwater N:P ratio, in agreement with Redfield's (1934Redfield's ( , 1958 classical hypothesis. Surprisingly, N:P ratio of phytoplankton does not affect their ability to regulate the deepwater N:P ratio. Our model suggests that increased water column stratification as a result of global climate change may decrease the stability of the N:P ratio in the deep ocean over long temporal and spatial scales.

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Light availability and rhizobium variation interactively mediate the outcomes of legume–rhizobium symbiosis

Heath

Podowski

Heniff

et al. 2020

American J of Botany

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Premise Nutrients, light, water, and temperature are key factors limiting the growth of individual plants in nature. Mutualistic interactions between plants and microbes often mediate resource limitation for both partners. In the mutualism between legumes and rhizobia, plants provide rhizobia with carbon in exchange for fixed nitrogen. Because partner quality in mutualisms is genotype‐dependent, within‐species genetic variation is expected to alter the responses of mutualists to changes in the resource environment. Here we ask whether partner quality variation in rhizobia mediates the response of host plants to changing light availability, and conversely, whether light alters the expression of partner quality variation. Methods We inoculated clover hosts with 11 strains of Rhizobium leguminosarum that differed in partner quality, grew plants under either ambient or low light conditions in the greenhouse, and measured plant growth, nodule traits, and foliar nutrient composition. Results Light availability and rhizobium inoculum interactively determined plant growth, and variation in rhizobium partner quality was more apparent in ambient light. Conclusions Our results suggest that variation in the costs and benefits of rhizobium symbionts mediate host responses to light availability and that rhizobium strain variation might more important in higher‐light environments. Our work adds to a growing appreciation for the role of microbial intraspecific and interspecific diversity in mediating extended phenotypes in their hosts and suggests an important role for light availability in the ecology and evolution of legume–rhizobium symbiosis.

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Chemistry in its application to agriculture and physiology

Cited by 116 publications

References 0 publications

Diagnosing oceanic nutrient deficiency

Diagnosing oceanic nutrient deficiency

Regulation of Redfield ratios in the deep ocean

Light availability and rhizobium variation interactively mediate the outcomes of legume–rhizobium symbiosis

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