Screening of Rice Genotypes for Iron Toxicity Tolerance Through Hydroponics

30 rice genotypes with different growing performances under Fe toxicity were screened under three levels, normal culture solution (control) and with excessive ferrous (Fe²⁺) concentrations of 600ppm and 800ppm. Remarkable genotypic variation in tolerance to excessive Fe²⁺ was observed. Variance due to genotypes was found highly significant for visual bronzing scores (toxicity) and biomass, which indicated that the genotypes differ significantly at all three levels. At 600 ppm of Fe, CUL-8723, IVT-33 and Thulasi were showing lowest leaf bronzing values. Whereas, CUL-8723, Thulasi and T(N)-1 showing lowest bronzing values at 800 ppm of Fe. Overall CSR 13, CUL-8709, CUL-210-29 and AM-10-7 were considered as highly susceptible genotypes for both observations and two Fe treatments. Thulasi was most tolerant genotype, as it shown lower leaf bronzing values, lower normalized values, higher biomass content and lower reduction percentage in biomass.