Tolerance mechanisms and irrigation management to reduce iron stress in irrigated rice

Iron toxicity is a major nutritional disorder in rice plants, especially flooded areas. The use of alternative crop management practices, such as soil drainage, may mitigate negative impacts iron toxicity, since aeration that follows drainage can oxidize and precipitate potentially toxic Fe+2 into Fe3+. This study aimed to evaluate the impact water on agronomical physiological parameters plants grown field location with history. Rice cultivars BR-IRGA 409 (sensitive) IRGA 425 (resistant toxicity) were tested. Irrigation comprised three treatments: continuous irrigation, one cycle suppression (1S) two cycles (2S). Evaluations included ionic composition solution leaf tissues, grain yield, antioxidant responses gene expression. Permanent flooding resulted higher yield from resistant than sensitive genotype, which had malondialdehyde (MDA) concentrations leaves. In contrast, alternate drying equivalent MDA both genotypes. Resistance seems related limited Fe translocation shoots, increased tolerance oxidative stress leaves expression Ferritin, OsGAP1, OsWRKY80 Oryzain-α genes. Plants cultivar (sensitive improved growth under interrupted irrigation treatments, probably due lower availability solution. Management successfully alleviated cultivated conditions.