%0 Journal Article
%T Effect of temperature and substrate on germination of Peltophorum dubium (Sprengel) Taubert seeds = Efeito da temperatura e do substrato na germina  o de sementes de Peltophorum dubium (Sprengel) Taubert
%A Edna Ursulino Alves
%A Roberta Sales Guedes
%A Edilma Pereira Gon£¿alves
%A Jeandson Silva Viana
%J Acta Scientiarum : Biological Sciences
%D 2011
%I Eduem - Editora da Universidade Estadual de Maring¨¢
%X Peltophorum dubium (Spreng.) Taub. is a species belonging to the family Fabaceae, and is known popularly as golden shower tree. Its wood has multiple uses in reforestation programs and as an ornamental tree, and is also considered an endangered species, requiring studies that assist in its preservation. The present work was conducted with the objective of determine the ideal substrate type and temperature to perform germination and vigor tests with P. dubium seeds. The experiment was carried out at the Seed Analysis Laboratory (Centro de Ci¨ºncias Agr¨¢rias, Universidade Federal Para¨ªba, Areia, Para¨ªba, Brazil), in a completely randomized design. The treatments were distributed in a 4 x 6 factorial scheme; temperatures (constant temperatures of 25, 30 and 35¡ãC; and alternate temperatures of 20- 30¡ãC) and substrate (paper towel, over blotting paper, in sand, in vermiculite, Bioplant  and Plantmax ) on four replications of 25 seeds. The following parameters were analyzed: germination percentage, germination speed index, first germination count, length and dry mass of seedlings. The constant temperature of 30¡ãC and 20-30¡ãC alternate, and the substrates into sand and paper towel can be recommended for germination and vigor tests of P. dubium seeds. The temperature of 25¡ãC should not be used in germination and vigortests of P. dubium seeds in any of the tested substrates. Peltophorum dubium (Spreng) Taub. ¨¦ uma esp¨¦cie pertencente ¨¤ fam¨ªlia Fabaceae, conhecida popularmente como canaf¨ªstula. A esp¨¦cie pode serutilizada como ornamental e sua madeira tem m¨²ltiplos usos em programas de reflorestamento, ¨¦ tamb¨¦m considerada uma esp¨¦cie em extin  o, fazendo-se necess¨¢rios estudos que auxiliem em sua preserva  o. Este trabalho teve como objetivo recomendar o substrato e a temperatura ideais para condu  o de testes de germina  o e vigor para sementes desta esp¨¦cie. O experimento foi realizado no Laborat¨®rio de An¨¢lise de Sementes (Centro de Ci¨ºncias Agr¨¢rias, Universidade Federal Para¨ªba, Areia, Para¨ªba, Brasil), em delineamento inteiramente ao acaso, com os tratamentos distribu¨ªdos em esquema fatorial 4 x 6 (temperaturas constantes de 25, 30 e, 35¡ãC ealternada de 20-30¡ãC e os substratos: papel toalha, sobre papel mata-borr o, entre areia, entre vermiculita, Bioplant  e Plantmax ), distribu¨ªdas em quatro repeti  es de 25 sementes. Foram analisadas as seguintes caracter¨ªsticas: germina  o, ¨ªndice de velocidade de germina  o, primeira contagem de germina  o, comprimento e massa seca de plantulas. Recomendam-se para condu  o dos testes de germina  o e vigor das sementes
%K golden shower tree
%K forest seeds
%K vigor
%K seed analysis
%K canaf¨ªstula
%K sementes florestais
%K vigor
%K an¨¢lises de sementes
%U http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7057/7057