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

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 exce...

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Bibliographic Details
Published in:Plant and soil 2015-06, Vol.391 (1/2), p.123-138
Main Authors: Müller, Caroline, Kuki, Kacilda Naomi, Pinheiro, Daniel Teixeira, de Souza, Laíse Rosado, Silva, Advânio Inácio Siqueira, Loureiro, Marcelo Ehlers, Oliva, Marco Antonio, Almeida, Andréa Miyasaka
Format: Article
Language:English
Subjects:
Analysis
Biomedical and Life Sciences
Cultivars
Ecology
Iron
Leaves
Life Sciences
Nutrient concentrations
Nutrient deficiency
Oxidative stress
Peroxidation
Photochemicals
Photochemistry
Photosynthesis
Physiological aspects
Physiological responses
Physiology
Plant Physiology
Plant Sciences
Regular Article
Rice
Soil Science & Conservation
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Summary: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.
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-015-2405-9