Irrigated rice genotype performance under excess iron stress in hydroponic culture
Maraisa Crestani, José Antonio Gonzalez da Silva, Velci Queiróz de Souza, Irineu Hartwig, Henrique de Souza Luche, Rogério Oliveira de Sousa, Fernando Irajá Félix de Carvalho and Antonio Costa de Oliveira
ABSTRACT – Iron stress is a major stress factor in irrigated rice. The complete mechanism underlying iron metabolism and transport is still unknown. Irrigated rice (Oryza sativa L.) cultivars were exposed to Fe stress in hydroponic conditions, aiming to assess genotype performance under stress well as to develop a protocol for genotype selection. The experimental design was completely randomized, using a triple factorial scheme 2 x 6 (time x dose x genotype). The trait shoot length and nine days under stress were favorable for genotype discrimination under iron stress. The genotypes BR IRGA 409 and BRS AGRISUL were, respectively, the most sensitive and tolerant genotypes to iron stress. According to the genotype performance, hydroponics can be recommended as an efficient cultivation technique for the selection of iron stress-tolerant rice genotypes.