PRIMING OF MIMOSA BIMUCRONATA SEEDS – A TROPICAL TREE SPECIES FROM BRAZIL
Priming is a technique used to improve seed performance. Mimosa bimucronata is one of the most important tree species used for tropical green area restoration in Brazil, as it is fast growing. This species is also planted for firewood, living fence, landscaping and honey production. The aim of this research was to evaluate the priming efficiency in M. bimucronata seeds. Before priming treatments, dormancy was overcome by cutting the seed coat extremity with a sharp blade. Seeds were primed in water for 11h and in aqueous PEG 8000 solution with osmotic potential of -0.8 MPa for 24, 48, 72 and 96h. After priming, the seed moisture content (MC) of all the treatments was approximately 50%. Half of the seed of each treatment was dried to the initial MC (6.6%) and both fresh primed and dried primed seeds were tested. Eight replicates of 25 seeds were used for each treatment. Germination percentage and speed of germination were evaluated, and seedling growth and uniformity were evaluated by using The Ohio State Universitys Seed Vigor Imaging System (SVIS-OSU). Electrical conductivity of seed leakage was also analyzed. The results showed that the PEG primed seeds, mainly fresh seeds primed for 48h, presented higher germination percentage and speed of germination, higher seedling growth and uniformity, and lower electrical conductivity. The benefits obtained with priming were partially lost with seed drying, since dried primed seeds had lower performance and higher electrical conductivity than fresh primed seeds. In conclusion, priming of M. bimucronata seeds is efficient to improve seed performance and it can be used as a methodology to improve seedling production and stand establishment.
Brancalion, P.H.S., Novembre, A.D.L.C., Rodrigues, R.R. and Tay, D. (2008). PRIMING OF MIMOSA BIMUCRONATA SEEDS – A TROPICAL TREE SPECIES FROM BRAZIL. Acta Hortic. 782, 163-168
polyethylene glycol, drying, seed vigor imaging system, electrical conductivity, seedling growth, seedling uniformity