Application of sonicated extracts of cyanobacteria and microalgae for the mitigation of bacterial canker in tomato seedlings
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Author/sToribio, A. J. Jurado, M. M. Suárez-Estrella, F. López-González, J. A. Martínez-Gallardo, M. R. López, M. J.
Microalgae and cyanobacteria could play an important role in crop protection, since they produce bioactive substances that promote plant growth and/or trigger the plant resistance mechanisms. The present study focuses on the control of bacterial canker caused by Clavibacter michiganensis subsp. michiganensis on tomato plants by using sonicated extracts from cyanobacteria and microalgae of the genera Leptolyngbya, Nostoc, Chlorella, and Scenedesmus. For the development of this study, 8 strains were firstly tested for their capacity to inhibit the growth of C. michiganensis subsp. michiganensis in vitro, as well as to produce cytokinins and salicylic acid. In order to discard those more phytotoxic strains, the germination index was also estimated in watercress seeds. Scenedesmus-677 and Leptolyngbya-1267 strains were selected in this first phase based on their pesticide and phytostimulant capacity in vitro. Subsequent bioassays on tomato seedlings showed that root application of Scenedes...