N2 Fixation and the Respiratory Costs of Nodules, Nitrogenase Activity, and Nodule Growth and Maintenance in Fiskeby Soyabean

Ryle, Gilbert; Arnott, R. A.; Powell, C. E.; Gordon, A. R.

doi:10.1093/jxb/35.8.1156

Cited by 29 publications

(12 citation statements)

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“…a). These estimates are consistent with measurements on a soybean−rhizobia mutualism, in which nodules received 3.6 mg C mg −1 N (Ryle et al ., ). In addition to comparing experimentally estimated and model‐predicted exchange ratios, we also examined how the exchange ratio influences partner benefits from trade, and therefore how well the model predicted partner growth rates and the proportion of plant carbon allocated to roots or shoots.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, the predicted carbon‐for‐nitrogen exchange ratio was experimentally estimated as the amount of carbon traded to the rhizobial partner for biomass and respiration, divided by the amount of nitrogen traded to the plant. These estimates should be regarded as conservative (low) because they do not include any additional respiration costs for growth or maintenance; however, we found that moderate increases (for example 3.6 mg C mg −1 N, Ryle et al ., ) beyond the minimum had little effect on model predictions.…”

Section: Methodsmentioning

confidence: 97%

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Unfair trade underground revealed by integrating data with Nash bargaining models

et al. 2019

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Summary Mutually beneficial resource exchange is fundamental to global biogeochemical cycles and plant and animal nutrition. However, there is inherent potential conflict in mutualisms, as each organism benefits more when the exchange ratio (‘price’) minimizes its own costs and maximizes its benefits. Understanding the bargaining power that each partner has in these interactions is key to our ability to predict the exchange ratio and therefore the functionality of the cell, organism, community and ecosystem. We tested whether partners have symmetrical (‘fair’) or asymmetrical (‘unfair’) bargaining power in a legume–rhizobia nitrogen‐fixing symbiosis using measurements of carbon and nitrogen dynamics in a mathematical modeling framework derived from economic theory. A model of symmetric bargaining power was not consistent with our data. Instead, our data indicate that the growth benefit to the plant (Medicago truncatula) has greater weight in determining trade dynamics than the benefit to the bacteria. Quantitative estimates of the relative power of the plant revealed that the plant's influence rises as soil nitrogen availability decreases and trade benefits to both partners increase. Our finding that M. truncatula legumes have more bargaining power than their rhizobial partner at lower nitrogen availabilities highlights the importance of context‐dependence for the evolution of mutualism with increasing nutrient deposition.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 97%

Unfair trade underground revealed by integrating data with Nash bargaining models

et al. 2019

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“…1993; Nielsen et al . 1998) and nitrogen‐fixing bacteria (Ryle et al . 1984), as well as for defence against fungal pathogens (Singh & Singh 1971; Uritani & Asahi 1980).…”

Section: Introductionmentioning

confidence: 99%

Influence of temperature and soil drying on respiration of individual roots in citrus: integrating greenhouse observations into a predictive model for the field

Bryla

Bouma

Hartmond

et al. 2001

Plant Cell & Environment

112

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In citrus, the majority of fine roots are distributed near the soil surface -a region where conditions are frequently dry and temperatures fluctuate considerably. To develop a better understanding of the relationship between changes in soil conditions and a plant's below-ground respiratory costs, the effects of temperature and soil drying on citrus root respiration were quantified in controlled greenhouse experiments. Chambers designed for measuring the respiration of individual roots were used. Under moist soil conditions, root respiration in citrus increased exponentially with changes in soil temperature ( Q 10 = 1·8-2·0), provided that the changes in temperature were short-term. However, when temperatures were held constant, root respiration did not increase exponentially with increasing temperatures. Instead, the roots acclimated to controlled temperatures above 23 ∞ ∞ ∞ ∞ C, thereby reducing their metabolism in warmer soils. Under drying soil conditions, root respiration decreased gradually beginning at 6% soil water content and reached a minimum at <2% soil water content in sandy soil. A model was constructed from greenhouse data to predict diurnal patterns of fine root respiration based on temperature and soil water content. The model was then validated in the field using data obtained by CO 2 trapping on root systems of mature citrus trees. The trees were grown at a site where the soil temperature and water content were manipulated. Respiration predicted by the model was in general agreement with observed rates, which indicates the model may be used to estimate entire root system respiration for citrus.

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“…Symbiosis provides usable N for the host and a reproductive niche for the bacteria; however, since nodulation is energetically costly (Ryle et al . ), plants inhibit or repress nodulation when there is sufficient usable N available (Kohl et al . ; Rennie ).…”

Section: Soybean As a Candidate Crop For Cultivation In Blssmentioning

confidence: 99%

Soilless cultivation of soybean for Bioregenerative Life‐Support Systems: a literature review and the experience of the MELiSSA Project – Food characterisation Phase I

et al. 2013

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Higher plants play a key role in Bioregenerative Life-Support Systems (BLSS) for long-term missions in space, by regenerating air through photosynthetic CO2 absorption and O2 emission, recovering water through transpiration and recycling waste products through mineral nutrition. In addition, plants could provide fresh food to integrate into the crew diet and help to preserve astronauts' wellbeing. The ESA programme Micro-Ecological Life-Support System Alternative (MELiSSA) aims to conceive an artificial bioregenerative ecosystem for resources regeneration, based on both microorganisms and higher plants. Soybean [Glycine max (L.) Merr.] is one of the four candidate species studied for soilless (hydroponic) cultivation in MELiSSA, because of the high nutritional value of the seeds. Within the MELiSSA programme - Food characterisation Phase I, the aim of the research carried out on soybean at the University of Naples was to select the most suitable European cultivars for cultivation in BLSS. In this context, a concise review on the state-of-the-art of soybean cultivation in space-oriented experiments and a summary of research activity for the preliminary theoretical selection and subsequent agronomical evaluation of four cultivars will be presented in this paper.

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N2 Fixation and the Respiratory Costs of Nodules, Nitrogenase Activity, and Nodule Growth and Maintenance in Fiskeby Soyabean

Cited by 29 publications

References 0 publications

Unfair trade underground revealed by integrating data with Nash bargaining models

Unfair trade underground revealed by integrating data with Nash bargaining models

Influence of temperature and soil drying on respiration of individual roots in citrus: integrating greenhouse observations into a predictive model for the field

Soilless cultivation of soybean for Bioregenerative Life‐Support Systems: a literature review and the experience of the MELiSSA Project – Food characterisation Phase I

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