The Relationship Between Bicarbonate Ion, pH, and<sup>59</sup>Fe Uptake by Plants

Falade, J. A.

doi:10.1093/jxb/23.4.941

Cited by 6 publications

(1 citation statement)

References 10 publications

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“…Rice grown on calcareous soil often suffers chlorosis. This phenomenon is usually attributed to Fe deficiency ( Rutland and Bukovac , 1971; Falade , 1972; Fleming et al, 1984). One explanation is that the redox potential in calcareous soils leads to oxidation of Fe 2+ to Fe 3+ , which is less available to plants.…”

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confidence: 99%

Effect of HCO $ _3^ - $ on rice growth and iron uptake under flood irrigation and drip irrigation with plastic film mulch

Zhang

Zhao

et al. 2015

J. Plant Nutr. Soil Sci.

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There has been a partial shift away from conventional flood irrigation (FI) practices for rice (Oryza stativa L.) production in water-scarce northern China. Drip irrigation with plastic film mulch (DI-PFM) can maintain high rice yields with significant water savings. However, rice seedlings often develop chlorosis when grown with DI-PFM on calcareous soil. Bicarbonate is a concern with regard to chlorosis in calcareous soil. The objective of this simulation experiment was to determine the effect of irrigation method and irrigation water HCO À 3 concentration on (1) soil pH and DTPA-Fe concentration, (2) chlorophyll, total Fe, and active Fe concentrations of rice leaves, and (3) rice root and shoot biomass. The experiment consisted of four treatments: FI with water containing either 2 or 10 mM HCO À 3 (referred to as FI-2 and FI-10, respectively) and DI-PFM with water containing 2 or 10 mM HCO À 3 (referred to as DI-2 and DI-10, respectively). The results show that the HCO À 3 concentrations of the soil solution were greater under FI than under DI-PFM, because more irrigation water was applied in the FI system. Soil pH increased as the HCO À 3 concentration of the irrigation water increased. The increase in soil pH was greater in DI-PFM than in FI. Soil DTPA-Fe concentration, leaf SPAD values, leaf total Fe concentration, leaf active Fe concentration, shoot biomass, and root biomass decreased as the HCO À 3 concentration of the irrigation water increased. The decreases were less under DI-PFM than under FI. Overall, the results indicate that rice plants are more sensitive to the HCO À 3 concentration of irrigation water under FI than under DI-PFM.

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Section: Introductionmentioning

confidence: 99%

Effect of HCO $ _3^ - $ on rice growth and iron uptake under flood irrigation and drip irrigation with plastic film mulch

Zhang

Zhao

et al. 2015

J. Plant Nutr. Soil Sci.

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Inhibition of iron‐stress reactions in sunflower by bicarbonate

Venkatraju

Marschner

1981

J Plant Nutrition & Soil

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In pot culture experiments using a calcareous soil the growth rate of sunflowers was depressed by latent iron deficiency. Iron‐stress reactions, reflected by enhanced uptake rate of Fe‐59 after short‐term supply of 59FeEDDHA were observed under these conditions. These reactions, however, were delayed and much less distinct than those observed under latent iron deficiency in water culture experiments. Addition of MgCO3 to this soil increased the iron deficiency of the plants and caused chlorosis, but prevented these iron‐stress reactions. In contrast to the soil experiments, distinct iron‐stress reactions could be observed with latent iron‐deficiency in sand culture experiments in which varied amounts of inorganic Fe‐III were supplied. These reactions were only observed, however, in absence of bicarbonate. Even 4 meq bicarbonate severely inhibited these iron‐stress reactions which were almost totally inhibited at 10 meq bicarbonate. Bicarbonate depressed both short‐term uptake of Fe‐59 as well as total iron content of the leaves. There was no evidence for an additional “inactivation” of iron within the leaves due to bicarbonate treatment. Bicarbonate also strongly depressed the manganese content of the young leaves. The results demonstrate that the regulatory mechanism of so‐called “iron‐efficient” plant species like sunflower under iron‐stress ‐ increase in H+ efflux and reducing capacity of the roots and thus enhanced uptake of iron (and manganese) ‐ is severely inhibited or even blocked by high bicarbonate concentrations. “Lime chlorosis”, caused by high bicarbonate concentrations on calcareous substrates is therefore also widespread in so‐called “iron‐efficient” species.

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Differential susceptibility of two populations of Eucalyptus viminalis labill. to iron chlorosis

Ladiges

1977

Plant Soil

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I n comparing two populations of E. viminalis observations indicated that plants of a calcareous population (i) showed a greater yield at high pH, and when subjected to Fe-stress, (ii) took longer to develop chlorosis, (iii) more quickly developed new roots, and (iv) were capable of removing more Fe from solution than were plants of an acid population. Some Fe-stressed plants also appeared to be able to reduce Fe 3+ to Fe 2+, but population differences have not yet been clearly established. Plants from an acidic population accumulated very high levels of P in leaves when grown in alkaline solutions and, consequently, exhibited high P/Fe ratios, chlorosis, and symptoms of P toxicity.

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The Relationship Between Bicarbonate Ion, pH, and⁵⁹Fe Uptake by Plants

Cited by 6 publications

References 10 publications

Effect of HCO $ _3^ - $ on rice growth and iron uptake under flood irrigation and drip irrigation with plastic film mulch

Effect of HCO $ _3^ - $ on rice growth and iron uptake under flood irrigation and drip irrigation with plastic film mulch

Inhibition of iron‐stress reactions in sunflower by bicarbonate

Differential susceptibility of two populations of Eucalyptus viminalis labill. to iron chlorosis

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The Relationship Between Bicarbonate Ion, pH, and59Fe Uptake by Plants

Cited by 6 publications

References 10 publications

Effect of HCO $ _3^ - $ on rice growth and iron uptake under flood irrigation and drip irrigation with plastic film mulch

Effect of HCO $ _3^ - $ on rice growth and iron uptake under flood irrigation and drip irrigation with plastic film mulch

Inhibition of iron‐stress reactions in sunflower by bicarbonate

Differential susceptibility of two populations of Eucalyptus viminalis labill. to iron chlorosis

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The Relationship Between Bicarbonate Ion, pH, and⁵⁹Fe Uptake by Plants