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Themain objective of this study was to evaluate some of the available seed vigor tests to predict lettuce ( Lactuca sativa L.) seedling emergence. Eight lettuce seed lots were evaluated by the following laboratory vigor tests: germination (GT), accelerated ageing (AA), saturated salt accelerated aging (SSAA),conductivity (EC), and digital image analysis (IA). Also evaluated were the percentage (EP) and speed(ES) of the seed lots emergence under three conditions: seedling trays (ST) filled with a mixture of peat (80%) and perlite (20%), boxes with a clay loam soil (S-boxes), and boxes with a mixture of clay loamsoil (66%) and sand (34%; SS-boxes). Correlation coefficients among the laboratory and emergence test results were calculated and significant differences were found. The correlation coefficients between EC results and each emergence parameter were not significant, while AA results were only significantly correlated with the emergence percentage for SS-boxes. GT values and emergence results were significantly correlated in all cases. SSAA results were equally or more positively correlated than GT results with the EP and, for the three sowing conditions, they were more correlated with the ES than GT values. Vigorindex results from the IA were significantly correlated with both emergence parameters, and its correlationwith emergence on ST (EP and ES) was greater than GT values. The results of this study showed that SSAA and IA were the best laboratory tests for lettuce seed vigor evaluation, especially for seed lots tobe used for plug seedling production. El objetivo de este estudio fue evaluar algunas de las pruebas de vigor disponibles en la prediccion de emergencia en plantulas de lechuga ( Lactuca sativa L.). Ocho lotes de semillas fueron evaluados por las siguientes pruebas de laboratorio: germinacion (PG), envejecimiento acelerado (EA), EA con saturacion de sales (EASS), conductividad electrica (CE) y analisis de imagen (AI). Tambien se evaluo el porcentaje (PE) y velocidad (VE) de emergencia de los lotes en tres condiciones: bandejas speedling (BS) con una mezcla de turba (80%) y perlita (20%), cajones con suelo franco arcilloso (CS) y cajones con una mezcla de suelo franco arcilloso (66%) mas arena (34%, CSA). Se establecieron las correlaciones entre los resultados de estas pruebas y las de laboratorio. La correlacion entre los resultados de CE y los parametros de emergencia no fue significativa en ninguna de las condiciones, mientras que EA solo lo fue con el PE de CSA. La correlacion de la PG fue significativa en todos los casos. Los resultados de la EASS estuvieron tanto o mas correlacionados que los de PG con PE y, para las tres condiciones, se correlacionaron mejor con la VE que los de PG. Resultados del AI se correlacionaron en forma significativa con PE y VE, presentando mejor correlacion con la emergencia en BS (PE y VE) que la PG. De acuerdo con los resultados, EASS y AI fueron las mejores pruebas de laboratorio para evaluacion de vigor en semillas de lechuga, especialmente cuando la semilla es usada para produccion de plantulas en bandeja.
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