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Tolerance of Platymiscium Floribundum Vog. Seeds to Water and Saline Stresses
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: 2007 ASAE Annual Meeting 077048.(doi:10.13031/2013.23016)
Authors: Maria Conceição Carvalho da Silva, Sônia Cristina Juliano Gualtieri de Andrade Perez, Antonio Ricardo Santos de Andrade, Carlos Alberto Vieira de Azevedo
Keywords: dry, salinity, germination
The objective of this research was to evaluate the maximum tolerance limits for water and saline stress on Platymiscium floribundum seeds, immerse in mannitol, PEG 6000, KCl and NaCl solutions for water and saline stress, with osmotic potentials of 0; -0.2; -0.4; -0.6; -0.8; and -1.0MPa. The experiments were carried out with four replications of 20 seeds germinated at 27°C, under permanent light. The obtained data were submitted to variance analysis and Tukey test. A significance reduction on rate and percentage of germination was registered at -0.2MPa and -0.6MPa, respectively, using mannitol and PEG 6000 solutions. When KCl and NaCl solutions were used a gradual reduction on germination percentage occurred. The highest values of the rate and percentage of germination were registered for seeds germinated in mannitol solutions, in all osmotic potentials. To saline stress, the reductions on percentage and germination rate of the seeds were gradual, in contrast to water stress. A significantly decrease on germination percentage was verified at -0.4MPa, for both salts. Referring to germination rate, significant reductions were detected at -0.6MPa and -0.8MPa for KCl and NaCl solutions, respectively. The maximum limit of tolerance to dry and to salinity was between -1.0 and-1.2MPa.(Download PDF) (Export to EndNotes)