Rice genotypes evaluate under the interactive phytotoxic effect of acetic, propionic and butyric acids

The objective of this work was to evaluate the development of 20 rice genotypes to acetic, pripionic and butyric acid, a phytotoxic compounds produced in low drainage soils with high organic matter content. This work was performed in hydroponics with four acid doses (0; 3; 6 e 9 mM) and 6: 3: 1 relationship acetic, propionic and butyric respectively. A factorial random block design with three replications were performed. The variables measured were root (CR) and shoot (CPA) length, number of roots (NR) and root (MSR) and shoot (MSPA) dry matter. The data relative to the measured variables were subjected to an analysis of variance in a factorial model (4x20) and regression fitting, considering dose and genotype as fixed factors. Significance for the interaction (genotype vs. dose) was found only for CR and CPA. The variable CR was the most influenced by the acid and the regression stablished for the variables CR and CPA revealed 2 genotypes with root length stability and 3 with shoot length stability front to organic acid stress. Genotypes with higher rusticity and developed for irrigated systems were more tolerant.