Root respiration and bacterial population of roots II. Effect of nutrient deficiency

Trolldenier, G.; Rheinbaben, W. Von

doi:10.1002/jpln.19811440406

Cited by 15 publications

(2 citation statements)

References 4 publications

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“…There are at least Firstly, active plant roots release organic exudates. This is thought to occur mainly in response to Fe and other micronutrient deficiencies (Treeby, Marschner & Romheld 1989), but Trolldenier & von Rheinbaben (1981) showed that root respiration and bacterial numbers increased in the rhizosphete under conditions of reduced K supply. They attributed the effect to a decrease in ATP synthesis in the plants and a gradual cessation of pyruvate kinase activity.…”

Section: Cadmium Zinc and Docmentioning

confidence: 99%

Changes in trace metal species and other components of the rhizosphere during growth of radish

Hamon

Lorenz

Holm

et al. 1995

Plant Cell & Environment

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Changes in the properties of soil solution in the rhizosphere of developing radish plants were investigated. Variations in these properties were expected to affect the distribution and speciation of metals in the soil and soil solution. Applications of essential nutrients were linked to plant transpiration rates and prevented excess addition of nutrient ions, so that subtle changes in soil solution composition would not be obscured. Soil solution pH, the concentration of dissolved organic carbon (DOC) and the concentrations of major and trace elements in solution were found to vary over time. Strict control of fertilizer additions led to the maintenance of a relatively low ionic strength in the soil solution, and under such conditions trace metal solubility appeared to be highy influenced by the concentration of DOC. A chemical speciation analysis was performed which showed that, while dissolved Cd and Zn were largely uncomplexed in unplanted soil, Cd and Zn in the rhizosphere existed mainly as complexed forms. It is hypothesized that this is partly a result of Ca‐metal‐ligand equilibrium in solution, with higher Ca concentrations in unplanted soil leading to more of the Cd and Zn in solution existing in the uncomplexed state. Changes in the concentrations of uncomplexed Cd and Zn with time gave the best correlations with changes in plant uptake of these metals over time, supporting the hypothesis that plants mainly absorb the free metal ion from soil solution.

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Section: Cadmium Zinc and Docmentioning

confidence: 99%

Changes in trace metal species and other components of the rhizosphere during growth of radish

Hamon

Lorenz

Holm

et al. 1995

Plant Cell & Environment

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“…Turner et al (1985) found no changes in bacterial numbers with changed plant nutrition but an increase in fungal biomass where nitrogen was limited (Turner and Newman, 1984a). Trolldenier and von Rheinbaben (1981b) measured the rhizoplane abundance and root respiration rate of wheat grown in nutrient solution. When nitrogen, phosphate and magnesium supplies were interrupted the respiration rate of the root + microorganisms declined and the number of rhizoplane bacteria were correlated with the rate of respiration.…”

Section: Introductionmentioning

confidence: 99%

Root exudation and rhizoplane bacterial abundance of barley (Hordeum vulgare L.) in relation to nitrogen fertilization and root growth

et al. 1990

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The abundance of bacteria in the rhizoplane of barley varieties was investigated at different soil nitrogen levels. Increased amendments of nitrogen resulted in higher bacterial numbers in the rhizoplane of barley seedlings of different varieties. A negative correlation was found between nitrogen level in the soil and the growth rate of the seedling roots. The effect of nitrogen on the bacterial abundances could be indirect through changed root growth and thereby changed exudation. The exudation of soluble organic carbon compounds from barley seedling roots were measured in hydroponic culture. The effect of natural variation in root growth rate and of different concentrations of nitrogen in the nutrient solution was investigated. The amount of exudates constituted 2-66% of the dry weight increase in root biomass, depending on the root growth. Slower growing roots released considerably more organic carbon per unit root weight than faster growing roots. The variation in root exudation appeared to be mainly explained by differences in root growth, rather than of the nitrogen concentration in the nutrient solution. A significantly higher exudation rate was found during day time compared to night.

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Denitrification on plants in nutrient solution culture

Rheinbaben¹,

Trolldenier²

1983

J Plant Nutrition & Soil

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Spring wheat was grown in aerated and unaerated, complete and potassium deficient nutrient solution to study the influence of these factors on denitrification. Denitrification was determined by the acetylene inhibition method. When plants were pregrown in aerated nutrient solution and subsequently placed in a fresh unaerated nutrient solution, the oxygen content of the fresh solution disappeared later than at pregrowth in unaerated nutrient solution. N2O production set in earlier with plants pregrown in unaerated medium. The more rapid decline of oxygen and the faster denitrification were due to higher numbers of bacteria, including denitrifiers, on roots pregrown in unaerated medium. Interruption of aeration caused an increase in bacterial number within 24 hours to the level of the continuously unaerated treatment. Apart from the root quantity per pot the denitrification potential of the roots played an important role in total denitrification. By our definition, denitrification potential represented the N2O production of 1 g excised roots over 4 hours under anaerobic conditions at unlimited nitrate supply. The denitrification potential of roots grown in unaerated nutrient solution exceeded that of roots cultivated in aerated medium. Also at potassium deficiency the number of total bacteria and denitrifiers as well as root respiration increased resulting in a higher denitrification potential.

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Root respiration and bacterial population of roots II. Effect of nutrient deficiency

Cited by 15 publications

References 4 publications

Changes in trace metal species and other components of the rhizosphere during growth of radish

Changes in trace metal species and other components of the rhizosphere during growth of radish

Root exudation and rhizoplane bacterial abundance of barley (Hordeum vulgare L.) in relation to nitrogen fertilization and root growth

Denitrification on plants in nutrient solution culture

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