Abstract
Abstract Variation in flowering times within genotype classes of the Early Flowering (Efef) gene in lettuce (Lactuca sativa L.) suggested that more than one gene may govern flowering time. Segregation from crosses between earlier and later plants in the early class indicated a second discrete flowering time gene. This gene was confirmed in F3 family analyses and in subsequent progeny comparisons. The first gene is renamed Early flowering-1 (Ef-lef-1) and the second is named Early flowering-2 (Ef-2ef-2). The consequences of the presence of the second gene in cultivars and in the backcross breeding procedure are discussed. Flowering time is influenced by daylength and temperature.
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