Avaliaˋˋo de gen車tipos de arroz sob efeito do 芍cido but赤rico

作者：Kopp; Mauricio Marini; Luz; Viviane Kopp da; Maia; Luciano Carlos da; Coimbra; Jefferson Luiz Meirelles; Sousa; Rogerio Oliveira de; Carvalho; Fernando Iraja Felix de; Oliveira; Antonio Costa de

来源：Acta Botanica Brasilica, 2010.

DOI：10.1590/S0102-33062010000200027

• abiotic stress
• organic acids
• oryza sativa
• phytotoxicity.

hydromorphic soils have low drainage capacity and are used mainly for growing irrigated rice.. this condition favors the development of anaerobic microorganisms that produce phytotoxic substances. the objective of this work was to evaluate the response of 25 rice genotypes to butyric acid, a phytotoxic compound produced in low-drainage soils with high organic matter content. this work was performed by hydroponics with four acid doses as treatments using a random block design with three replications. the variables measured were root (cr) and shoot (cpa) length, number of roots (nr) and root (msr) and shoot (mspa) dry matter. analysis of variance, relative performance and regression fitting were performed. significance for genotype and dose was found for all variables. significance for the interaction (genotype vs. dose) was found only for cr and msr. the variable cr was the most influenced by the acid and the regression established for these variables revealed nine tolerant and 16 sensitive genotypes. genotypes developed for irrigated systems were more tolerant.