The role of salicylic acid (SA) in growth regulation and the change in the levels of phytohormones (IAA, ABA, and cytokinins) were studied in the wheat calli co-cultured with bunt pathogen Tilletia caries. Calli infection with T. caries resulted in the hypertrophied callus growth and simultaneous increase in phytohormone level. The addition of SA to the nutrient media decreased the callus growth induced by the pathogen, whereas the level of investigated phytohormones was not affected. In the SA-treated infected calli, the formation of necrotic lesions was observed in the zones of contact of the fungal mycelium with callus cells that limited pathogen growth. The authors suggest that the stabilization of the hormonal balance of plant cells at pathogenesis is one of the possible mechanisms of the SA protective action in vitro and in vivo. Hence, co-culturing wheat calli and T. caries fungus appeared to be a convenient model for assessing SA protective action.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 18, 2004
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