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Intensification of arsenic toxicity to paddy rice oryza sativa cultivar koshihikari by hydrogen sulfide and ferrous iron 1. induction of bronzing and iron accumulation in rice by arsenic



Intensification of arsenic toxicity to paddy rice oryza sativa cultivar koshihikari by hydrogen sulfide and ferrous iron 1. induction of bronzing and iron accumulation in rice by arsenic



Soil Science and Plant Nutrition 26(4): 561-570



The phytotoxicity of As to paddy rice was examined by the pot culture method using Utsunomiya grey lowland soil which had received nutrient salts including ammonium sulfate with or without additional rice straw powder as a reducing agent. By treatment with 50 ppm of arsenic and straw, plant growth was retarded from the beginning of culture, and about 6 wk later, at the middle of July, small reddish black spots emerged near the tips of expanded green leaves. The spots then increased and spread over the whole leaves resulting in bronzing and final dieback in about the mid-Aug. On treatment with higher concentrations of As and straw, the plants were more severely injured and died through bronzing at earlier stages. All such dead plants were found to have accumulated abnormally high Fe in their leaf tissues. On treatment with lower concentrations of As and straw or in the case of higher arsenic without straw, plant growth and grain yield were reduced with the occurrence of partial bronzing or organging of leaves and the Fe content of the plants was somewhat increased. As may induced ferrous iron toxicity which intensifies the toxicity of arsenic to paddy rice.

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Accession: 005718038

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