Effect of the application of alpha naphthyl sodium acetate (Aponon®) on colonization and production of spores of arbuscular mycorrhiza-forming fungi in lettuce (Lactuca sativa)
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Abstract
The effect of a synthetic auxin, alpha naphthyl sodium acetate (Aponon®), was evaluated on the growth of lettuce plants (Lactuca sativa) and their associations with arbuscular mycorrhizal fungi. Percentage colonization, number of arbuscules, coils and vesicles and production of spores of arbuscular mycorrhizal fungi were evaluated. Lettuce plants were inoculated with three species of mycorrhizal fungi (Glomus clarum, G. intraradices and G. mosseae). Three doses of Aponon® (10.6 mg/l, 21.18 mg/l and 42.35 mg/l) were applied and both noninoculated controls and controls without the application of the synthetic hormone were used.
The plants were harvested after 90 days. Plants inoculated with G. clarum and with the highest dose of Aponon® resulted in the highest value for colonization. The higher the dose of Aponon®, the lower the colonization percentage in the plants inoculated with G. intraradices and G. mosseae. The percentage of arbuscules and vesicles showed a similar pattern to that of colonization in the plants inoculated with G. clarum and G. intraradices. The coils had low values in all treatments. Glomus mosseae and G. intraradices decreased their spore production as the dose of Aponon® increased, whereas G. clarum did not show differences in relation to the dose of Aponon®. The greatest plant biomass was observed in the plants inoculated with G. mosseae lacking or with minimal doses of Aponon®.
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