Edna de Oliveira Silva

Superação de dormência em sementes de biribá (Rollinia mucosa (Jacq.) Baill)

The Rollinia mucosa belongs to the Annonnaceae family and its fruits have great popular acceptance, being commercialized and consumed in natura. As is the case of the majority of the native species, it needs agronomics studies, to be exploted in a rational and sustainable way. The objective of this research was to study the effect of appropriate treatments to overcome dormancy in seeds of R.mucosa. The seeds were submitted to the following treatments: T1 - control treatment (intact seeds); T2 - seeds scarified with sandpaper N° 80 on one of the sides; T3 -seeds scarified with sandpaper N° 80 on the two sides; T4 - seeds scarified with sandpaper N° 80 on the opposite side to the micropylar region; T5 - seeds scarified with sandpaper N° 80 on the opposite side to the micropylar region + soaked in distilled water for 24 hours; T6 - seeds scarified with N° 80 sandpaper on the two sides + soaked in water distilled water for 24 hours; T7- seeds scarified with N° 80 sandpaper on one of the sides + soaked in distilled water for 24 hours. The seedling emergence, emergence speed index, length and dry matter of the root and aerial part were evaluated. A randomized complete design was used, with seven treatments and four replications of 25 seeds per treatment. The averages were compared by the Tukey test. the treatments were efficient for overcoming Rollinia mucosa seed dormancy, and the seeds scarified with N° 80 sandpaper on the two sides + soaked in distilled water for 24 hours (T6) provided the greatest plantule emergency percentage.