On-line version ISSN 1806-9088
OLIVEIRA, Lucicléia Mendes de et al. Dormancy break in seeds of SamaneatubulosaBenthan - (Leguminoseae-Mimosoideae). Rev. Árvore [online]. 2012, vol.36, n.3, pp.433-440. ISSN 1806-9088. http://dx.doi.org/10.1590/S0100-67622012000300005.
Samaneatubulosa (Bentham) is a large tree with fruit of sweetened flavor- which potentiates the tree for apiculture use - containing from 5 to 31 seeds presenting dormancy due to the impermeability of its tegument. Thus, the objective of this work was to select methods to break dormancy of the seeds. The study was carried out in a laboratory and in a greenhouse environment, without control of environmental conditions at Centro de Ciências Agrárias (CCA) at Universidade Federal da Paraíba. The treatments used were the following: T1 - control; T2 - blunts; T3, T4 and T5 -immersion in concentrated sulfuric acid for 5, 10 and 15 minutes; and T6, T7, T8 - immersion in hot water for one minute at 60, 70 and 80 ºC, respectively. The parameters evaluated were the percentage of emergence, emergency velocity indices (IVE), length and dry weight of seedlings. The results showed that the treatments which stood out in dormancy break of seeds were acid scarification (concentrated sulfuric acid for 5, 10 and 15 minutes) and lopping, which accounted for the best results of physiological quality of seedlings.However, in practical terms, it is recommended the use of scarification with concentrated sulfuric acid for 5 minutes or even the lopping.
Keywords : Bordão de velho; Dormancy; Emergency; Impermeability.