Effect of an extract of Sargassum fluitans on tomato seed germination
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Abstract
Biostimulants based on seaweed extracts can be an option to improve germination and plant growth. The objective of this work was to evaluate the effect of treating tomato seeds with different solutions of an aqueous extract of Sargassum fluitans on germination. Two experiments were carried out; in the first one, seeds of cv. Mariela were immersed for two hours in different concentrations (0.01, 0.05, 0.1, 0.5, 1, 1.5, 2, 2.5, 3 %) of Sargassum fluitans aqueous extract. Seeds were placed in Petri dishes containing distilled water and the dishes were placed in the dark in a germination chamber at 28-30 ºC for ten days. At seven days, the germination percentage was evaluated and at ten days, the dry mass of radicles was evaluated. This experiment was repeated using the three best performing concentrations and the same evaluations were made, in addition to the dynamics and speed of germination. In the second experiment, the same three concentrations of the extract were used and the seeds were placed on plates containing 50 or 75 mmol L-1 NaCl solution and germination and growth indicators were evaluated. The results showed that seed treatment with 1.5 % solution of the extract stimulated radicle growth under both normal and saline conditions. However, the final germination percentage did not always increase significantly and there was no response when seeds were germinated in NaCl 75 mmol L-1.
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