Effect of the application of alpha naphthyl sodium acetate (Aponon®) on the colonization and production of spores of arbuscular mycorrhiza-forming fungi in lettuce plants (Lactuca sativa L.).

VELÁZQUEZ M. S; IRRAZABAL G. B

ournal of Agricultural Technology

Bangkok, Tailandia

Año: 2006 vol. 2 p. 59 - 67

1686-9141

The effect of a synthetic auxin, alphanaftil sodium acetate (Aponon®), was evaluated on the growth of lettuce plants (Lactuca sativa) and their association with arbuscular mycorrhizal fungi. Percentage colonization, number of arbuscules, coils and vesicles and production of spores of arbuscular mycorrhizal fungi were evaluated. Lettuce palnts were inoculated with three species of mycorrhizal fungi (Glomus clarum, G. intraradices and G. mosseae). Three doses of Aponon® (10.6mg/l, 21.18mg/l and 42.35mg/l) were applied and both non inoculated controls and controls withouth the application of the synthetic hormone were used. The plants were harvested after 90 days. Plants inoculated with G. clarum and with the highest 12 of Aponon® resulted in the highest values for colonization. The higher the 12 of Aponon®, the lower the colonization percentages in the plants inoculated with G. intraradices and G. mosseae. The percentages of arbuscules and vesicules showed a similar pattern to that of colonization in the plant inoculated with G. clarum and G. intraradices. The coils had low values in all treatments. Glomus mosseae and G. intraradices decreased their spores production as the dose of Aponon® increased, whereas G. clarum did not show deferences in relation to the dose of Aponon®. The greastet plant biomass was observed in the plant inoculated with G. mosseae laking or with minimal dose of Aponon®