Germinação, qualidade sanitária e armazenamento de sementes de canafístula (Peltophorum dubium)

Abstract

The objective of this work was to evaluate the effect of dormancy overcoming treatments andstorage environment on physiological and phitopathologic quality of canafístula seeds (Peltophorum dubium).Seeds were submitted to the following treatments of dormnancy superação: scarification with sandpaper (200);immersion in water at room temperature for 24 and 72 hours; (c) immersion in sulfuric acid for 2, 6, 10,15, 20 and 30 minutes); immersion in hot water (70, 80 and 90°C); (e) moistening of the substratum with KNO 3 solution of (0.2%). Seeds were stored at room temperature and at 10°C for 210 days. Effects of treatmentsand storage were evaluated by water content, germination test (five replicates of 30 seeds), seedlings lengthand sanity test (400 seeds), with eight-day incubation. It was used a complete random experimental designfor data statistics analysis with a 2 x 14 factorial design (storage conditions x treatments for dormancy overcoming).Means were compared by the Tukey test (P>0.5). Regarding non-stored seeds, the best treatments to overcomedormancy and to promote germination were scarification with sandpaper or sulfuric acid for 15 and 30 minutes;regarding stored seeds, there was immersion in hot water (70 and 80°C). Fungi detected in the samples werePestalotia sp., Alternaria sp., Rhizopus sp., Nigrospora sp., Curvularia sp., Fusarium sp., Rhizoctonia sp.,Aspergillus sp., Cladosporium sp. and Fusarium semitectum.