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Responses of rice to chronic and acute iron toxicity: genotypic differences and biofortification aspects Michael Frei, Richmond Narh Tetteh, Ando Lalaina Razafindrazaka, Michael Apolonius Fuh, Lin-Bo Wu & Mathias Becker Plant and Soil An International Journal on Plant-Soil Relationships ISSN 0032-079X Plant Soil DOI 10.1007/s11104-016-2918-x
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Author's personal copy Plant Soil DOI 10.1007/s11104-016-2918-x
REGULAR ARTICLE
Responses of rice to chronic and acute iron toxicity: genotypic differences and biofortification aspects Michael Frei & Richmond Narh Tetteh & Ando Lalaina Razafindrazaka & Michael Apolonius Fuh & Lin-Bo Wu & Mathias Becker
Received: 29 February 2016 / Accepted: 9 May 2016 # Springer International Publishing Switzerland 2016
Abstract Background and aims Iron (Fe) toxicity is a widespread stress in lowland rice production. The aim of this study was to differentiate between responses to acute Fe stress during the vegetative stage and chronic Fe stress throughout the growing period. Methods Six rice genotypes were tested in a semiartificial greenhouse setup, in which acute (almost 1500 mg L−1 Fe in soil solution during the vegetative stage) and chronic (200 to 300 mg L−1 Fe throughout the season) Fe toxicity were simulated. Results Acute Fe stress induced early development of heavy leaf bronzing, whereas moderate symptoms occurred in the chronic treatment throughout the season. Grain yields were only reduced in the chronic stress treatment (−23 %) due to reductions in spikelet fertility, grain number and grain weight. Symptom formation during the early growth stages did not reflect yield responses in all genotypes. Only one genotype showed increases in grain Fe concentrations (24 % in the acute
Responsible Editor: Michael A. Grusak. Electronic supplementary material The online version of this article (doi:10.1007/s11104-016-2918-x) contains supplementary material, which is available to authorized users. M. Frei (*) : R. N. Tetteh : A. L. Razafindrazaka : M. A. Fuh : L.
