Decrease in variable charge and acidity of root surface under Al treatment are correlated with Al tolerance of cereal plants

Józefaciuk, Grzegorz; Szatanik-Kloc, Alicja

doi:10.1023/b:plso.0000030175.23904.5a

Cited by 15 publications

(11 citation statements)

References 36 publications

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“…The root surface charge changes during various stressing conditions that is most probably associated with changes in roots tissue structure and chemical composition. This was proved for aluminum and heavy metals toxicity by Jozefaciuk and Szatanik-Kloc (2004) or Szatanik-Kloc (2010). Therefore we hypothesized that low moisture stress can also affect roots surface charge properties, that to our knowledge still remains to be elucidated.…”

Section: Introductionmentioning

confidence: 85%

“…From the second side, higher surface potential can induce higher water (strong dipole) binding forces what can decelerate water lost and help plant to compete with soil for water. This is worth mentioning that aluminum and heavy metals toxicity also induce decrease in roots CEC, however the surface acidity decreases (Jozefaciuk & Szatanik-Kloc, 2004;Szatanik-Kloc, 2010). This seems logic because lower surface acidity decreases toxic cations uptake.…”

Section: Discussionmentioning

confidence: 99%

“…Under some assumptions (Nederlof, 1993;Jozefaciuk & Szatanik-Kloc, 2004), the N s versus pH dependence may be treated as the Q V versus (apparent) surface dissociation constant, pK app , dependence:…”

Section: Methodsmentioning

confidence: 99%

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Unknown Mechanism of Plants Response to Drought: Low Soil Moisture and Osmotic Stresses Induce Severe Decrease in CEC and Increase in Acidity of Barley Roots

Lukowska¹,

Józefaciuk²

2013

JAS

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Huge amount of papers describe plant response to drought, however information on reaction of plant roots cation exchange capacity and surface acidity on draught conditions is up to date lacking. These parameters are important for amount and ratio of cations uptake by plants. Since other stresses induce changes in roots cation exchange capacity and acidity, we hypothesized that draught does this also. In this paper we checked this hypothesis. Surface charge properties of roots of drought tolerant and draught resistant barley varieties taken from pot (soil draught at water potential pF=3.5) and hydroponic (osmotic stress induced by mannitol) experiments were determined using back-titration method. The stresses were applied at tillering stage. Soil draught and osmotic stress caused even fivefold decrease in cation exchange capacity and up to tenfold increase in acidity of roots of all barley varieties. Surface charge properties of nonstressed roots did not differentiate draught resistant and draught tolerant varieties, however the intensity of roots reaction on the stresses seemed to be higher for draught sensitive plants. This newly presented mechanism of plant reaction on drought indicates that nutrients uptake by plants can be severely limited and relative uptake of polyvalent cations (aluminum or heavy metals) may increase causing additional toxicity. This may serve as additional explanation of plant growth and yield limitation in dry environments.

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Section: Introductionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

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Unknown Mechanism of Plants Response to Drought: Low Soil Moisture and Osmotic Stresses Induce Severe Decrease in CEC and Increase in Acidity of Barley Roots

Lukowska¹,

Józefaciuk²

2013

JAS

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“…Not only the roots biomass, length, density and depth undergo marked changes, but more subtle variations in protein composition, enzyme activities, gene expression patterns (Bian and Jiang 2009;Oh and Komatsu 2015;Shan et al 2015;Subbarao et al 1995) occur, as well. The cation exchange capacity (CEC) of the roots, governing the ions ratio and their uptake by plants, changes under different stressing conditions that was reported for aluminum and heavy metals toxicity (Jozefaciuk and Szatanik-Kloc 2004;Szatanik-Kloc 2010). Lukowska and Jozefaciuk (2013) found that low soil moisture and osmotic stresses decreased the CEC and variable charge of barley roots and increased their average values of surface dissociation constants.…”

Section: Introductionmentioning

confidence: 97%

Osmotic stress induces severe decrease in cation exchange capacity and surface groups of medium acidity in roots of cereal plants

Lukowska

Józefaciuk

2016

Acta Physiol Plant

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Huge amount of information on the plants response to drought is available throughout the literature; however, extremely rare information concerns effects of limited water availability on cation exchange capacity (CEC) and surface acidity of plant roots despite their importance for cations uptake by plants. As it is known, the CEC and acidity of barley roots markedly decrease under a low soil moisture and osmotic stresses, so we studied the behavior of the other cereal plants. Surface charge properties of roots of wheat, triticale, rye, oats and barley grown in hydroponics under osmotic stress induced at tillering stage by various mannitol concentrations were determined using a back-titration method. Roots size distributions were measured also. The osmotic stress caused down to a fivefold decrease in the CEC and a twofold decrease in the relative amount of surface functional groups of medium acidic strength, whereas no well-defined trends were observed for surface acidity. The above changes were the highest for rye and the lowest for oats. The general root's architecture remained roughly same; however,' the roots length markedly decreased under stress. The smallest decrease in roots length was observed for barley. Decrease in CEC and roots length may be the primary reasons for severe limitation in nutrient uptake by plants during drought.

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“…Anatomical and biochemical changes under the stress are reflected in physicochemical characteristics of the root. Szatanik-Kloc et al (2001), Józefaciuk andSzatanik-Kloc 2004 showed that relative number of surface functional groups can vary under influence of low pH and aluminium.…”

Section: Introductionmentioning

confidence: 99%

Changes in variable charge and acidity of rye (Secale cereale L.) roots surface under Zn-stress

2008

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The plants of winter rye variety Rostockie grown in nutrient solution prepared according to Marschner and Romheld (1983) were stressed at shooting stage with different zinc (ZnCl 2 ) concentrations of 0, 20, 200 and 400 mgXdm -3 during 10 days at pH = 4.5. The control plants were grown continuously at pH = 7, without Zn 2+ . The roots of all plants were titrated with 0.1 molXdm -3 NaOH in 1 molXdm -3 NaCl solution with a rate 0.01 ml/min using auto-titrator Titrino 702 (Metrohm). The amount of the base consumed between pH 3 and 10 was recorded with a step of 0.1 pH unit. From the titration data root surface charge was characterized. Roots grown at pH = 4.5 without Zn 2+ addition, had apparently the same charge properties as the control roots. Under 200 and 400 mgXdm -3 of zinc addition, variable charge, Q, and the cation exchange capacity, CEC, of the roots significantly decreased as did the fractions of surface acidic functional groups of strong and medium acidity i.e. the groups having apparent surface dissociation constants, Kapp, between 10 -3.5 and 10 -5.5 . For 20 mgXdm -3 zinc stress the fraction of weaker surface groups (surface dissociation constants around 10 -6.5 ) decreased also. The surface charge density, SCD, of roots decreased under the Zn stress.

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Decrease in variable charge and acidity of root surface under Al treatment are correlated with Al tolerance of cereal plants

Cited by 15 publications

References 36 publications

Unknown Mechanism of Plants Response to Drought: Low Soil Moisture and Osmotic Stresses Induce Severe Decrease in CEC and Increase in Acidity of Barley Roots

Unknown Mechanism of Plants Response to Drought: Low Soil Moisture and Osmotic Stresses Induce Severe Decrease in CEC and Increase in Acidity of Barley Roots

Osmotic stress induces severe decrease in cation exchange capacity and surface groups of medium acidity in roots of cereal plants

Changes in variable charge and acidity of rye (Secale cereale L.) roots surface under Zn-stress

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