The effects of root surface charge and nitrogen forms on the adsorption of aluminum ions by the roots of rice with different aluminum tolerances

Liu, Zhaodong; Wang, Hai-cui; Xu, Runsheng

doi:10.1007/s11104-016-2909-y

Cited by 27 publications

(19 citation statements)

References 53 publications

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“…The means of zeta potential in Figure 2 were calculated from six individual indica varieties or six individual japonica varieties (Supplementary Table S1 ). The zeta potential became more negative as the pH of the nutrient solution increased because of the increasing dissociation of functional groups on the roots, as was also observed earlier ( Li et al, 2015 ; Liu et al, 2016 ), and was more negative in indica than in japonica ( Figure 2 ): the difference was significant ( P < 0.05), suggesting that root surfaces of indica rice carry a greater negative charge and thus have greater electrostatic attraction for metal cations.…”

Section: Resultssupporting

confidence: 72%

“…Rice varieties of the japonica group tolerate Al toxicity better than those of the indica group do ( Ma et al, 2002 ; Watanabe and Okada, 2005 ; Yang et al, 2008 ; Famoso et al, 2010 ; Zhao et al, 2013 ). The varieties sensitive to Al carry a greater negative charge on their roots than those tolerant to Al ( Yermiyahu et al, 1997 ; Wang et al, 2015 ), which is one of reasons for the lower tolerance of the sensitive varieties ( Wang et al, 2015 ; Liu et al, 2016 ). In the present study, roots of six indica varieties were observed to carry a greater negative charge than that carried by roots of the six japonica varieties ( Figure 2 ).…”

Section: Resultsmentioning

confidence: 99%

“…There are three initial concentrations of 10, 40, and 100 μM for both metals. After 2 h, the roots were removed, washed twice in deionized water, blotted dry with filter paper, and placed sequentially in 1 L each of 0.1 M KNO 3 , 0.05 M EDTA-2Na (pH 6), and 0.01 M HCl, 1 h in each solution, to extract the exchangeable, complexed, and precipitated Cu or Cd from the root surfaces, respectively ( Liu and Xu, 2015 ; Liu et al, 2016 ), and their contents in the extractants were determined using atomic absorption spectrophotometry (nov AA350, Analytik Jena AG, Jena, Germany). After the rice roots were exposed to metal solution for 2 h, the amount of Cu and Cd entered the symplasm during the experiment should be much lower, thus they were not measured and discussed in this study.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, a streaming potential intrument has been developed to measure the zeta potential of intact roots and was used for investigating the relationship between the zeta potential of rice roots and the adsorption of aluminium (Al) by those roots ( Li et al, 2015 ; Liu et al, 2016 ). In the present experiment, we used the technique together with attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) (1) to ascertain whether the differences in root surface charges between indica and japonica are universal; (2) to examine the effects of these differences on the adsorption of Cu and Cd on rice roots; and (3) to find out the possible mechanisms of such adsorption.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Surface Charge and Functional Groups on the Adsorption and Binding Forms of Cu and Cd on Roots of indica and japonica Rice Cultivars

et al. 2017

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This work was designed to understand the mechanisms of adsorption of copper (Cu) and cadmium (Cd) on roots of indica and japonica varieties of rice. Six varieties each of indica and japonica rice were grown in hydroponics and the chemical properties of the root surface were analyzed, including surface charges and functional groups (-COO- groups) as measured by the streaming potential and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). Binding forms of heavy metals adsorbed on rice roots were identified using sequential extraction methods. In rice roots exposed to Cu and Cd solutions, Cu existed mainly in both exchangeable and complexed forms, whereas Cd existed mainly in the exchangeable form. The amounts of exchangeable Cu and Cd and total adsorbed metal cations on the roots of indica varieties were significantly greater than those on the roots of japonica varieties, and the higher negative charges and the larger number of functional groups on the roots of indica varieties were responsible for their higher adsorption capacity and greater binding strength for Cu and Cd. Surface charge and functional groups on roots play an important role in the adsorption of Cu and Cd on the rice roots.

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Surface Charge and Functional Groups on the Adsorption and Binding Forms of Cu and Cd on Roots of indica and japonica Rice Cultivars

et al. 2017

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“…Plant cells are surrounded by cell walls that contain pectin, which is rich in carboxylic acid groups that impart fixed negative charges to cell surfaces. Thus, the effects of the negative charges on nutrient absorption by roots has been investigated using both cell walls and intact roots [25–27]. In addition, both the weathering of clay minerals and decomposition of soil organic matters can be enhanced in rhizosphere, through the action of plants and microorganisms.…”

Section: Resultsmentioning

confidence: 99%

Properties of rhizosphere soil associated with herbaceous plant roots analyzed using small-scale protocols

Yamazaki

Ochiai

Motokawa

et al. 2019

Preprint

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22The rhizosphere, which is the region of soil adjacent to plant roots, is affected by 23 the activities of both plant roots and associated microorganisms which cause changes in 24 soil properties including nutrient mineral composition. Accordingly, the actual 25 availability of plant nutrients may not be the same as that estimated on the basis of bulk 26 soil analysis. However, the extent and manner in which the availability of plant nutrients 27 in bulk and rhizosphere soils differ remain unclear. Therefore, the present study defined 28 the rhizosphere as the soil adhered to plant roots, established a set of small-scale protocols 29 for analyzing the nutrient minerals of small soil samples, and then characterized the 30 rhizosphere soil of sorghum, Sorghum bicolor (L.) Moench. The mineral contents of the 31 bulk and rhizosphere soil differed significantly, with nutrient contents generally greater 32 in the rhizosphere, and particularly remarkable accumulation was observed in regards to 33 ammonium ion and exchangeable potassium concentrations. Such accumulation might be 34 due, in part, to the greater per weight surface areas of rhizosphere soil particles, but other 35 mechanisms, including the accumulation of organic matter, could also be involved.3 36 Introduction 37 The environment in the immediate vicinity of plant roots, the rhizosphere, is 38 generally considered to be distinct from that of the surrounding soil (i.e., bulk soil), and 39 the differences in these two regions can be attributed to multiple factors. Respiration by 40 roots, for example, is associated with the consumption of oxygen and production of 41 carbon dioxide, thereby causing local changes in gas composition. Meanwhile, the 42 excretion of exudates by plant roots provides a food source for heterotrophic microbes 43 and promotes the establishment of distinct microbial communities [1][2][3]. Furthermore, the 44 selective uptake of nutrients by roots, release of protons or bicarbonate ions in exchange 45 with absorbed nutrients, and the release of plant-derived organic acids or chelators to 46 solubilize sparingly soluble salts cause changes in the chemical composition of the 47 rhizosphere [4]. Together, the resulting differences between the nutrient availabilities of 48 bulk and rhizosphere soil can have significant effects on plant growth. However, the 49 extent and manner in which the availability of plant nutrients in bulk and rhizosphere 50 soils differ remain unclear. For example, the ammonium ion (NH 4 + ) levels of rhizosphere 51 soil have been reported to be both higher [5][6][7] or lower [8,9] than that of bulk soil, and 52 the same trend has been reported for potassium (K) [10][11][12]. 53To gain insights into the rhizosphere, soil needs to be fractionated according to 54 distance from plant roots. The so-called "rhizobox" technique, for example, allows roots 55 grow within a compartment of soil that is separated from the surrounding region with fine 56 mesh, which prevents the roots from mixing with the surrounding soil but...

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More negative charges on roots enhanced manganese(II) uptake in leguminous and non‐leguminous poaceae crops

Nkoh

et al. 2023

J Sci Food Agric

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BACKGROUND: Manganese (Mn) is an essential micronutrient for plants, whereas excess Mn(II) in soils leads to its toxicity to crops. Mn(II) is adsorbed onto plant roots from soil solution and then absorbed by plants. Root charge characteristics should affect Mn(II) toxicity to crops and Mn(II) uptake by the roots of the crops. However, the differences in the effects of root surface charge on the uptake of Mn(II) among various crop species are not well understood. RESULTS:The roots of nine legumes and six non-legume poaceae were obtained by hydroponics and the streaming potential method and spectroscopic analysis were used to measure the zeta potentials and functional groups on the roots, respectively. The results indicate that the exchangeable Mn(II) adsorbed by plant roots was significantly positively correlated with the Mn(II) accumulated in plant shoots. Legume roots carried more negative charges and functional groups than non-legume poaceae roots, which was responsible for the larger amounts of exchangeable Mn(II) on legume roots in 2 h and the Mn(II) accumulated in their shoots in 48 h. Coexisting cations, such as Ca 2+ and Mg 2+ , were most effective in decreasing Mn(II) taken up by roots and accumulated in shoots than K + and Na + . This was because Ca 2+ and Mg 2+ could compete with Mn(II) for active sites on plant roots more strongly compared to K + and Na + . CONCLUSION: The root surface charge and functional groups are two important factors influencing Mn(II) uptake by roots and accumulation in plant shoots.

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The effects of root surface charge and nitrogen forms on the adsorption of aluminum ions by the roots of rice with different aluminum tolerances

Cited by 27 publications

References 53 publications

Effects of Surface Charge and Functional Groups on the Adsorption and Binding Forms of Cu and Cd on Roots of indica and japonica Rice Cultivars

Effects of Surface Charge and Functional Groups on the Adsorption and Binding Forms of Cu and Cd on Roots of indica and japonica Rice Cultivars

Properties of rhizosphere soil associated with herbaceous plant roots analyzed using small-scale protocols

More negative charges on roots enhanced manganese(II) uptake in leguminous and non‐leguminous poaceae crops

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