PHYSIOLOGIC BEHAVIOR OF MYRACRODRUON URUNDEUVA (ANACARDIACEAE) Fr. All. SEEDS SUBMITTED TO ABIOTIC FACTORS

• Published in: Ciência florestal Vol. 22; no. 4; pp. 681 - 692
• Main Authors: Ivana Oliveira Virgens, Renato Delmondez de Castro, Luzimar Gonzaga Fernandez, Claudinéia Regina Pelacani
• Format: Journal Article
• Language: Portuguese
• Published: Universidade Federal de Santa Maria 01.12.2012
• Subjects: aroeira-do-sertão; screening hídrico; screening térmico
• ISSN: 0103-9954; 1980-5098
• DOI: 10.5902/198050987550

http://dx.doi.org/10.5902/198050987550 The aim of this work was to evaluate germinating seeds of  Myracrodruon urundeuva under different temperatures and hydrous potentials, the combination of both and the seeds viability after osmotic conditioning. The assay was conducted in a totally casual analysis with four repetition contained 50 seeds by treatment. The temperatures of 20, 25, 30, 33, 35 and 40ºC were tested with seeds soaked in distilled water. In another assay, the osmotic potentials of 0,0 (evidence) were tested; -0,2; -0,4; -0,6; -0,7; -0,8; -0,9; -1,0 e -1,2 MPa using PEG 6000 solutions. Based in these tests, it was established the best temperatures and the osmotic potentials of maximum germination, fifty percent of germination and no germination. After end of hydrous screening, no germinating seeds in no germinating potentials was tested for its capacity of germinating in water. Also, different temperatures were combined with different osmotic potentials. The seed germination Myracrodruon urundeuva starts in two days. At the temperature of 250C, it was obtained for maximum seed germination of the species at 330C for 50% of the seeds germinated and at 400C, the germination was zero. Regarding to water restriction induced -0.2 MPa, it was an optimum germination potential, the potential of -0.7 MPa 50% germination and from -0.9 MPa and germination was nil.   The osmotic potentials of -0.9, -1.0 and -1.2 MPa, can be used for priming this species. The seeds of Myracrodruon urundeuva not tolerate the stresses of high temperatures and decreased water potential, concurrently, as they reduce the germination and seed vigor.