Root-released organic acids and phosphorus uptake of two barley cultivars in laboratory and field experiments

Gahoonia, Tara Singh; Asmar, Farouq; Giese, Henriette; Gissel‐Nielsen, Gunnar; Nielsen, Niels Erik

doi:10.1016/s1161-0301(00)00052-6

Cited by 83 publications

(36 citation statements)

References 26 publications

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“…It was found that the amount and composition of OAs in the rhizosphere varied with plant species and P status of growth medium as well as the growth stage of the plant (Lambers et al 2006). P-efficient plant species or cultivars secrete larger amounts of P-mobilizing OAs under LP stress, such as barley (Gahoonia et al 2000), maize (Hinsinger 2001), rape (Brassica napus L.) (Zhang et al 2011) and Arabidopsis (Narang et al 2000), resulting in alleviation of P stress. This observation implied that an LP-tolerant genotype XZ99 had the lowest contents of all three OAs including citrate, succinate and malate under CK conditions, and the highest contents under LP stress.…”

Section: Discussionmentioning

confidence: 99%

The changes in physiological and biochemical traits of Tibetan wild and cultivated barley in response to low phosphorus stress

Nadira

Ahmed

Zeng

et al. 2014

Soil Science and Plant Nutrition

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Low phosphorus (LP) limits crop growth and productivity in the majority of arable lands worldwide. Here, we investigated the changes in physiological and biochemical traits of Tibetan wild barleys (Hordeum vulgare L. ssp. spontaneum) XZ99 (LP tolerant), XZ100 (LP sensitive), and cultivated barley ZD9 (moderately LP tolerant) under two phosphorus (P) levels during vegetative stage. These genotypes showed considerable differences in the change of biomass accumulation, root/shoot dry weight ratio, root morphology, organic acid secretion, carbohydrate metabolism, ATPase (Adenosine triphosphatase) activity, P concentration and accumulation under LP in comparison with CK (control) condition. The higher LP tolerance of XZ99 is associated with more developed roots, enhanced sucrose biosynthesis and hydrolysis of carbohydrate metabolism pathway, higher APase (Acid phosphatase) and ATPase activity, and more secretion of citrate and succinate in roots when plants are exposed to LP stress. The results prove the potential of Tibetan wild barley in developing barley cultivars with high tolerance to LP stress and understanding the mechanisms of LP tolerance in plants.

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Section: Discussionmentioning

confidence: 99%

The changes in physiological and biochemical traits of Tibetan wild and cultivated barley in response to low phosphorus stress

Nadira

Ahmed

Zeng

et al. 2014

Soil Science and Plant Nutrition

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“…Plant and soil parameters are given in Appendix B, Tables 5 and 6. Exudation rates were calculated to simulate a C flux of 2.0 · 10 -9 -2.0 · 10 -6 mmolC cm À2 root s -1 (Jones and Darrah 1995;Jones and Hodge 1999;Farrar and Jones 2000;Gahoonia et al 2000). Most plant parameters come from data measured on grasses.…”

Section: Parameterisationmentioning

confidence: 99%

Soil microbial loop and nutrient uptake by plants: a test using a coupled C:N model of plant–microbial interactions

2006

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We have developed a spatially explicit model of plant root and soil bacteria interactions in the rhizosphere in order to formalise and study the microbial loop hypothesis that postulates that plants can stimulate the release of mineral N from the soil organic matter by providing low molecular weight C molecules to C-limited microorganisms able to liberate into the soil enzymes that degrade the organic matter. The model is based on a mechanistic description of diffusion of solutes in the soil, nutrient uptake by plants, bacterial activity and bacterial predation. Modelled soil bacterial populations grow, mediate transformations among several forms of nitrogen (mineral and organic) and compete for nitrogen with plants. Our objectives were to see if we could simulate the stimulation of turnover of the microbial loop by exudates and to study the effects of diffusion of C and N in the rhizosphere on these different processes. The model qualitatively mimics most of the characteristics of the microbial loop hypothesis. In particular, (1) plant exudates increase the growth of bacteria in the soil and (2) increase the degradation of soil organic matter and N mineralisation. (3) The increased bacterial biomass induces an increase in predator biomass and, as a result, (4) plant mineral N uptake is increased threefold compared with scenarios without exudation. However, the temporal dynamics simulated by the model are much slower than observed dynamics (the increase in uptake appears after a few months). Taking into consideration the diffusion of C and N containing molecules in soil has large effects on the spatial structure of the bacterial and predator biomass. However, the average biomass of bacteria and predators, N mineralisation and plant N uptake were not affected by these properties. The model provides a quantitative and mechanistic explanation of how plants could beneﬁt from liberating low molecular organic matter and the subsequent stimulation of the microbial loop and increases N mineralisation

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“…Organic acids of low molecular weight (LOAs) such as malic, citric, acetic, and oxalic acids are directly involved in a number of soil processes, such as podzolization (Lundstrom et al, 2000), reduction of aluminum toxicity (Jones, 1998;Silva et al, 2001;Jones et al, 2003) and increase in nutrient availability, e.g., P (Gahoonia et al, 2000;Andrade et al, 2003), Ca and Mg (Jones & Brassington, 1998), and Mn and Fe (Jones, 1998).…”

Section: Introductionmentioning

confidence: 99%

Organic acid adsorption and mineralization in oxisols with different textures

Andrade

Mendonça

Silva³

2013

Rev. Bras. Ciênc. Solo

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SUMMARY Organic acids play an important role in the nutritional conditions of plants.Their relevance is related to their formation dynamics, mineralization rate and adsorption by soil colloids. This study was carried out to evaluate the dynamics of mineralization and adsorption of organic acid (acetic acid -AA, citric acid -CA and humic acid -HA) applied to the soil. Samples of two Oxisols were used: Rhodic Haplustox (LV) and Typic Haplustox (LVA). The mineralization experiment was arranged in a 2 x 3 x 5 factorial design, based on the factors: two soils (LV and LVA) x three organic acid (OA) types (AA, CA and HA) x five OA rates (0, 1, 2, 4, and 8 mmol dm -3 ). Organic carbon mineralization in samples was measured by the C-CO 2 efflux, produced by the microbial activity, in a 30-day (measurements after 4, 8, 12, 21, and 30 days) and in a 4-day experiment (measured after 24, 48, 72 and 96 h). Organic acid adsorption was tested in a 2 x 2 x 5 x 4 factorial design, with the factors and levels: two Oxisols; two organic acids (AA and CA); five OA rates (0, 1, 2, 4, and 8 mmol dm -3 ) and four adsorption periods (6, 24, 48, and 72 h). The C-CO 2 production of soil treated with CA was highest. In the adsorption experiment, the affinity of CA to soil adsorption sites was greatest. The adsorption of organic acids to soils may be an important mechanism by which bioavailability and thus mineralization capacity by microbial activity are reduced.Index terms: citric acid, humic acids, sorption, biodegradation. RESUMO: ADSORÇÃO E MINERALIZAÇÃO DE ÁCIDOS ORGÂNICOS EM LATOSSOLOS COM DIFERENTES TEXTURAS

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Root-released organic acids and phosphorus uptake of two barley cultivars in laboratory and field experiments

Cited by 83 publications

References 26 publications

The changes in physiological and biochemical traits of Tibetan wild and cultivated barley in response to low phosphorus stress

The changes in physiological and biochemical traits of Tibetan wild and cultivated barley in response to low phosphorus stress

Soil microbial loop and nutrient uptake by plants: a test using a coupled C:N model of plant–microbial interactions

Organic acid adsorption and mineralization in oxisols with different textures

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