Tropical Rice Cultivars from Lowland and Upland Cropping Systems Differ in Iron Plaque Formation

Pereira, Eduardo Gusmão; Oliva, Marco Antônio; Siqueira-Silva, Advanio Inácio; Rosado-Souza, Laíse; Pinheiro, Daniel Teixeira; Almeida, Aparecida Marques de

doi:10.1080/01904167.2014.888744

Cited by 26 publications

(8 citation statements)

References 52 publications

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“…The accumulation of various nutrients in leaves was affected by excess iron in the solution. This was previously observed in other studies and the degree of mineral nutrient variation may depend on iron dosage, time of exposure, developmental stage and genotype (Dorlodot et al 2005;Pereira et al 2014;Silveira et al 2007). However this is the first time that different types of iron sources are evaluated.…”

Section: Cultivarsupporting

confidence: 69%

“…The high iron accumulation associated with a high biomass production indicates a tissue tolerance mechanism (Elec et al 2013). In other experiments using iron sulfate in similar concentrations but in the absence of chelators it was observed much higher shoot iron concentrations than in our conditions (Pereira et al 2014;Wu et al 2014). In our experiments EDTA was used as an iron chelator preventing its precipitation in the nutrient solution.…”

Section: Cultivarsupporting

confidence: 48%

“…The addition of EDTA may have also favored the bioavailability by minimizing reoxidation of iron and iron plaque formation (Taylor et al 1984;Snowden and Wheeler 1995). Indeed, iron plaque formation was induced in Brazilian upland and lowland cultivars when iron sulfate was provided without the use of the chelating agent (Pereira et al 2014). Unfortunately in this work we did not measured iron plaque formation.…”

Section: Discussionmentioning

confidence: 86%

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Differential physiological responses in rice upon exposure to excess distinct iron forms

et al. 2015

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Background and aims Rice can be cultivated in highlands, which can expose it to iron deficiency, or under irrigation, which can lead to iron toxicity and lower productivity. This study aimed to investigate the strategies used by rice plants under different divalent and trivalent sources of iron excess. Methods Rice plants from a lowland and upland cultivar were grown in nutrient solution with toxic concentrations of ferrous or ferric iron. A mineral nutrient quantification and anatomical analysis were performed on leaves and roots. Physiological damage was assessed by leaf photochemical parameters and lipid peroxidation. Expression levels of genes related to iron homeostasis were analyzed. Results More pronounced nutritional deficiencies, oxidative stress and physiological damage were observed in plants exposed to toxic levels of ferrous iron. Ferritin expression increased in leaves of both cultivars under ferrous or ferric iron excess. Conclusions We showed that sulfate iron was more toxic to the two rice cultivars even though this iron source was less translocated in the plant. Trivalent iron complexed to citrate is easily translocated through rice plants, but it is less toxic than the divalent iron. Rice plants are able to cope with this iron overload by keeping photosynthetic apparatus working properly.

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Section: Cultivarsupporting

confidence: 69%

Section: Cultivarsupporting

confidence: 48%

Section: Discussionmentioning

confidence: 86%

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Differential physiological responses in rice upon exposure to excess distinct iron forms

et al. 2015

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“…It may be achieved by the regulation of Fe uptake, as seen by Silveira et al, (2009). In fact, the oxidation of Fe 2+ to Fe 3+ at the root surface, resulting in a typical orange precipitate known as iron plaque, was reported previously for the EPAGRI 107 cultivar (Pereira et al, 2014). However, even resistant cultivars, closely related to the EPAGRI 107 cultivar, may present different tolerance strategies to cope with iron overload (Stein et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…The roots become dark brown in color and develop poorly, and exhibit a scanty and coarse aspect (Becker and Asch, 2005;Silveira et al, 2009). Iron toxicity also reduces growth and yield (Dorlodot et al, 2005), causes nutritional disorders (Pereira et al, 2014) and severe impairment in rice photosynthesis (Pereira et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Oxidative damage and photosynthetic impairment in tropical rice cultivars upon exposure to excess iron

Pinto

Souza

Oliva

et al. 2016

Sci. agric. (Piracicaba, Braz.)

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Iron plays a pivotal role in the redox reactions of photosynthesis and metabolic processes such as chlorophyll synthesis. Iron availability in waterlogged soils can reach toxic levels and promote oxidative stress. Fe toxicity is the most concerning of stresses for rice in many lowland environments around the world and may cause severe impairments in rice photosynthesis. This study aimed to investigate the extension of oxidative stress after excess Fe exposure and its effects on the photosynthesis of rice cultivars with differential sensitivity. Three Brazilian rice cultivars (EPAGRI 107, BRSMG SELETA and BR IRGA 409) were grown in Hoagland nutrient solution (pH 4.0) with two Fe-EDTA doses corresponding to excess Fe (7 mM) and control (0.009 mM) treatments. After just three days of excess Fe exposure, there was a significant increase in iron concentration in the shoots. The BR IRGA 409 cultivar exhibited higher Fe accumulation in its shoots, and the EPAGRI 107 cultivar recorded the lowest values, which were below the critical toxicity level, as a resistance strategy. Impairment in light energy partitioning and oxidative damage became evident before changes in stomatal resistance, chlorophyll content, maximal PSII quantum yield or visual symptoms for the most sensitive cultivar (BR IRGA 409). The photosynthesis limitations, in addition to the impairment of excess energy dissipation in rice from iron toxicity, are the results of oxidative damage.

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Iron plaque formation, characteristics, and its role as a barrier and/or facilitator to heavy metal uptake in hydrophyte rice (Oryza sativa L.)

Zandi

Yang

Darma

et al. 2022

Environ Geochem Health

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Tropical Rice Cultivars from Lowland and Upland Cropping Systems Differ in Iron Plaque Formation

Cited by 26 publications

References 52 publications

Differential physiological responses in rice upon exposure to excess distinct iron forms

Differential physiological responses in rice upon exposure to excess distinct iron forms

Oxidative damage and photosynthetic impairment in tropical rice cultivars upon exposure to excess iron

Iron plaque formation, characteristics, and its role as a barrier and/or facilitator to heavy metal uptake in hydrophyte rice (Oryza sativa L.)

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