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- W64229325 abstract "The objectives of this work were to verify the effects of osmotic stress on the germination of balsa tree seeds and the role played by putrescine on the attenuation of that stress. Two experiments were conducted to reach those objectives. The first was structured in a 4 X 6 factorial scheme where 4 osmotic agents [polyethylene glycol (PEG) 6000, CaCl2, NaCl, and KCl ] were applied to the seeds at the osmotic potentials of 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5 MPa the seeds being placed in a BOD type germinator at the temperature of 35 °C to germinate. Seed germination and speed of germination were monitored daily during 30 days. In the second experiment, the same four osmotic agents of the first experiment were used but at osmotic potentials limiting germination to 50% (-0.2, -0.3, and -0.4 MPa) and putrescine applied at the amounts of 0, 2, and 4 mM in a 4 X 4 X3 factorial scheme (4 agents, 4 potentials, and 3 putrescine concentrations). Osmotic stress interfered in seed germination – germination and speed of germination were reduced by increasing osmotic potential, especially when the osmotic agent was of the saline type. Putrescine promoted increments in seed germination when they were exposed to the more negative osmotic potential with the highest values taking place at the concentration of 4 mM. On the other hand, seed speed of germination decreased when this regulator was present. Putrescine had no effect on the seeds behavior when they were submitted to PEG. Additional keywords: Balsawood; forest species; salt stress; water stress. Cientifica, Jaboticabal, v.41, n.2, p.99–110, 2013 ISSN: 1984-5529" @default.
- W64229325 created "2016-06-24" @default.
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- W64229325 date "2013-01-01" @default.
- W64229325 modified "2023-09-26" @default.
- W64229325 title "Osmotic stress and putrescine effects on the germination of balsa tree [Ochroma pyramidale (Cav. Ex Lam) Urb (Malvaceae)] seeds." @default.
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