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The objective of this study was to determine the responses of the wheat cultivars CD 108 and CD 111 for tolerance to organic acids. The effects of five concentrations of the three main acids formed in the soil were studied: acetic acid (0, 4, 8, 12 and 16 mM), propionic acid (0, 4, 8, 12 and 16 mM) and butyric acid (0, 2, 4, 8 and 12 mM). Tests included germination, shoot length, root length and dry weight of shoot and root. The variable root length is the most responsive variable for all the acids tested and the critical level of toxicity of acetic, propionic and butyric acids, which reduced root length by at least 50% was 9.0, 8.5 and 4.0 mM respectively. It was concluded that the presence of acetic, propionic and butyric acids in the germination substratum of wheat seeds of the cultivars CD 111 and CD 108 reduced seedling development, mainly by reducing the length of the radicles. O objetivo deste estudo foi avaliar as respostas das cultivares de trigo CD 108 e CD 111 para tolerância a ácidos orgânicos. Os efeitos de cinco concentrações dos três principais ácidos, formados no solo, foram estudados: ácido acético (0, 4, 8, 12 e 16 mM), ácido propiônico (0, 4, 8, 12 e 16 mM) e ácido butírico (0, 2, 4, 8 e 12 mM). Os testes realizados foram: germinação, comprimento da parte aérea, comprimento da raiz, massa seca da parte aérea e da raiz. A variável comprimento de raízes é a mais sensível para todos os ácidos e o nível crítico de toxicidade dos ácidos acético, propiônico e butírico, que reduziu em pelo menos 50% o comprimento da raiz, foi de 9.0, 8.5 e 4.0 mM, respectivamente. Concluiu-se que a presença dos ácidos acético, propiônico e butirico em substratos para germinação de sementes de trigo cultivares CD 111 e CD 108 reduz o desenvolvimento de plântulas, principalmente por reduzir o comprimento de raízes

Critical levels of organic acids on seed germination and seedling growth of wheat