Water and Microbial Stress

Griffin, D. M.

doi:10.1007/978-1-4615-8306-6_3

Cited by 182 publications

(87 citation statements)

References 70 publications

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“…A possible explanation for this different response could be related to the low P availability in the P-poor C. vulgaris litter. At low soil water content, diffusion of soluble substrates is reduced (Griffin 1981a) and/or microbial mobility and consequent access to substrate declines (Griffin 1981b;Killham et al 1993). This could affect the mineralization and immobilization of the limiting nutrient (P) more strongly than the availability of the more abundant nutrients (C and N).…”

Section: Discussionmentioning

confidence: 99%

Regulation of microbial carbon, nitrogen, and phosphorus transformations by temperature and moisture during decomposition of Calluna vulgaris litter

2007

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To evaluate the effect of climate change on ecosystem functioning, the temperature and moisture response of microbial C, N, and P transformations during decomposition of Calluna vulgaris (L.) Hull. litter was studied in a laboratory incubation experiment. The litter originated from a dry heathland in the Netherlands where P limited vegetation growth. Fresh litter was incubated at 5, 10, 15, or 20°C and at a moisture content of 50, 100, or 200% in a full factorial design. Microbial nutrient transformations and activity were evaluated during two successive periods: an initial period of 48 days characterized by microbial growth and a second period from 48 to 206 days in which microbial growth declined significantly. Temperature and moisture response of respiration rate, the metabolic quotient (qCO 2 ), C, N, and P immobilization, net N and P mineralization and nitrification rates were evaluated by performing linear regressions. Microbial nutrient transformations and microbial activity depended both on temperature and moisture. In the first period, the respiration rate, qCO 2 , microbial C and N immobilization, net P mineralization, net N mineralization and net nitrification rates were more strongly affected by temperature, while the microbial P immobilization rate was more strongly affected by moisture. The respiration rate, qCO 2 , P immobilization rate, net P and N mineralization rate, and nitrification rate increased with temperature and moisture, while the C and N immobilization rate decreased with increasing temperature and increased with moisture. In the second period, C, N, and P immobilization and net N and P mineralization rates were significantly lower. The respiration rate and qCO 2 continued to increase with temperature and moisture, but C and N immobilization rates increased with temperature and declined with increasing moisture. Net P mineralization rate decreased at higher temperature and moisture, and nitrification rate declined with increasing temperature and increased with moisture. It was concluded that plant growth in these P-limited systems is very sensitive to climate change as it strongly relies on the competition for P with microbes, and temperature and moisture have a large effect on the immobilization rate of available P.

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Section: Discussionmentioning

confidence: 99%

Regulation of microbial carbon, nitrogen, and phosphorus transformations by temperature and moisture during decomposition of Calluna vulgaris litter

2007

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“…Concentrations of the major solutes have been estimated using the measured water content with corrections for non-solvent water in the walls as determined by electron microscopy (Luard, 1980) and 25 % of the cytoplasmic water also being unavailable as a solvent (Cooke & Kuntz, 1974;Griffin, 1981). At an external potential of -2 MPa, when the osmoticum was sucrose, there was an overestimation of about 0-7 MPa in the calculated value relative to the observed potential.…”

Section: Discussionmentioning

confidence: 99%

Growth and Accumulation of Solutes by Phytophthora cinnamomi and Other Lower Fungi in Response to Changes in External Osmotic Potential

Luard

1982

Microbiology

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Proline and the solute used to control the osmotic potential of the medium, either sucrose or KCl, accumulated in the hyphae of Phytophthora cinnamomi as the steady state external potential decreased. Proline also accumulated in three other lower fungi. Very little polyol was detected in any of the species analysed. Proline was lost following hypoosmotic shock and accumulated after hyperosmotic shock in P . cinnamomi. The time taken for growth to resume after shock treatment was variable, but less than 5 h. Potassium was the predominant cation in hyphae grown on sucrose but chloride was insufficient to maintain electroneutrality. The potassium to sodium ratio followed a similar pattern to the radial growth rate with respect to external potential, with maxima at a potential slightly below the highest potential tested. When the osmoticum was sucrose, the calculated internal potential was 20% greater than the observed osmotic potential, but when the osmoticum was KCl, the calculated potential was too high by a factor of more than two, probably indicating error in assumptions concerning the location of ions within the hyphae.

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“…R m is sensitive to variation in soil water status as water content strongly influences microbial physiological processes (Liu et al 2002, Xu et al 2004. When soil water content decreases, the metabolic activity of most microbial species also decreases, resulting in decreased R m and nutrient mineralization (Griffin 1981, Schimel et al 2007). Reportedly, the effect of water content on R m differed among litter types both in laboratory experiments (Manzoni et al 2012) and in the field (Jomura et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Response of microbial respiration from fine root litter decomposition to root water content in a temperate broad-leaved forest

Kawamura¹,

Makita²,

Osawa³

2013

Plant Root

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_____________________________________________________________________________________________________________________________________________________________________________. Microbial respiration in both diameter classes and species decreased linearly with decreasing root water content. These changing patterns of microbial respiration did not differ significantly between the diameter classes of either species, indicating that microbial respiration was regulated by the moisture of root litter, and not by characteristics associated with diameter class or species. In contrast, the carbon to nitrogen ratio and mass loss of the root litter differed significantly between diameter classes in both species. These findings suggest that along with chemical and morphological properties of fine root litter, the changes in root water content should also be considered as a viable factor in microbial activity variations. Drying-wetting cycles of fine roots could lead to sensitive responses of microorganisms during the short term, leading to variation in the decomposition rate of fine root litter over the long term. This study provided insight into the potential impact of microbial physiological performance on heterotrophic respiration and fine root decomposition under the varying root water content.

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Water and Microbial Stress

Cited by 182 publications

References 70 publications

Regulation of microbial carbon, nitrogen, and phosphorus transformations by temperature and moisture during decomposition of Calluna vulgaris litter

Regulation of microbial carbon, nitrogen, and phosphorus transformations by temperature and moisture during decomposition of Calluna vulgaris litter

Growth and Accumulation of Solutes by Phytophthora cinnamomi and Other Lower Fungi in Response to Changes in External Osmotic Potential

Response of microbial respiration from fine root litter decomposition to root water content in a temperate broad-leaved forest

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