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Canafistula seeds have a naturally slow and irregular germination due to tegument impermeability. In this study, the efficacy of nonchemical methods was investigated to break the tegument dormancy and enhance the germination rate of canafistula [Peltophorum dubium (Spreng.) Taub. – (Fabaceae)] seeds. A completely randomized design with eight treatments of seed dormancy breaking and four replications of 25 seeds each was used. Different methods to break the seed dormancy were compared: T1: untreated seeds to break dormancy (control); T2: sanding; T3: soaked in hot water (95 C) and cooled for 24 hours; T4: pre-soaking in boiling water (100 °C) for 5 minutes; T5, T6 T7 and T8: seeds exposed to dry heating in an oven at 40 °C for 24, 48, 72 and 96 hours, respectively. All seeds were germinated in sand, and kept in a greenhouse conditions for 25 days. The emergence capacity, emergence rate index, plant growth rate, dry matter partitioning into roots and shoots, and vigor index of canafistula seedlings were measured. Mechanical scarification (sanding) and soaking in hot water (95 C) and cooled for 24 hours were efficient to breaking the tegument dormancy and enhanced the seed emergence rate and vigor of Peltophorum dubium (Fabaceae) seedlings.

Non-chemical methods to break seed dormancy of canafistula [Peltophorum dubium (Sprengel) Taubert (Fabaceae)]