Genetic and morphological analysis tolerance to ferrous and ferric forms of iron in rice

Abstract

An experiment was conducted in the rain out shelter with the objective of analysing the effect of ferric and ferrous iron on rice genotypes and for identifying the tolerant genotypes for iron toxicity. The study was comprised with 12 varieties/genotypes of indica rice, exposed under different concentrations (0, 40 and 80 mg/kg) of two different forms of iron viz., ferrous sulfate (FeSO4) and ferric chloride (FeCl3). Visual scoring scale was used to screen the genotypes and effects of excess iron were examined on different vegetative traits in which root weight and shoot weight were found to be more sensitive to excess iron concentration of both forms. In two different form of iron ferrous form was found toxic than ferric form of iron but high amount of ferric chloride without chelating agent can cause death of plants in hydroponics condition. The soil used for experiments was also analysed to estimate the pH and status of other nutrients in soil. On the basis of visual scoring we identified 4 genotypes tolerant (Dagad deshi, IBD-1, R-RF-127, R-RF 105) and Swarna as susceptible genotype for both form ferrous and ferric iron.