Temperature effect on the germination and root growth of Jatoba-Mirim

• Published in: Ciência florestal Vol. 24; no. 1; p. 111
• Main Authors: de Oliveira, Ademir Kleber Morbeck, Pereira, Kelly Cristina Lacerda
• Format: Journal Article
• Language: Portuguese
• Published: Universidade Federal de Santa Maria 01-01-2014
• Subjects: Forestry research; Germination; Growth; Plant embryology; Plant propagation; Tree seeds; Brazil
• ISSN: 1980-5098; 1980-5098

Jatoba-Mirim species belongs to Fabaceae family and is distributed through Pantanal and Caatinga areas. Its wood is suitable for the construction and the manufacture of luxury furniture and is recommended for urban forestry and used to compose heterogeneous reforestation. Taking into account their potential use this work was developed with the objective of evaluating the effect of different temperatures on the germination rate and initial root growth of Jatoba-Mirim seeds. The seeds used in this experiment were harvested at 'Cabeceira do Prata' farm, located in 'Jardim' municipality, in Mato Grosso do Sul state, in September 2009. The material collected was transported to the Laboratory of Research on Bio-diversity and Environmental Systems at Anhanguera-Uniderp University where the research was developed. The seeds were submitted to constant temperatures of 20, 25, 30, 35[degrees]C and alternated temperatures of 2030 and 25-35[degrees]C, in six treatments, kept in germination cameras of B.O.D type. The obtained results show that the best temperatures for the seed germination are 30[degrees]C (90%), 35[degrees]C (97%) and 25-35[degrees]C (90%), statistically equal, certifying that those temperatures are more efficient to promote the germination. Taking into account the mean time for germination, germination speed index and dry matter production, constant temperatures of 30 and 35[degrees]C are better and its results, statistically equal and higher than other treatments. Keywords: calcareous forest; forest seeds; native species. A especie Jatoba-Mirim pertence a familia Fabaceae, apresentando-se distribuida pelos biomas Pantanal e Caatinga. Sua madeira e indicada para construcao civil e confeccao de mobiliario de luxo, e a arvore e recomendada para arborizacao urbana e utilizada para a composicao de reflorestamentos heterogeneos. Levando-se em consideracao seu potencial de utilizacao, este trabalho foi desenvolvido com o objetivo de verificar o efeito de diferentes temperaturas sobre as taxas de germinacao e crescimento radicular inicial de sementes de Jatoba-Mirim. As sementes utilizadas no experimento foram coletadas na Fazenda Cabeceira do Prata, Municipio de Jardim, Mato Grosso do Sul, em setembro de 2009. O material coletado foi transportado para o Laboratorio de Pesquisa em Sistemas Ambientais e Biodiversidade da Universidade AnhangueraUniderp, no qual o experimento foi desenvolvido. As sementes foram submetidas a seis tratamentos, em temperaturas constantes, de 20, 25, 30 e 35[degrees]C e alternadas de 20-30 e 25-35[degrees]C em camaras de germinacao tipo BOD. Os resultados obtidos evidenciaram maior percentagem de germinacao das sementes nas temperaturas de 30[degrees]C (90%), 35[degrees]C (97%) e 25-35[degrees]C (90%), estatisticamente iguais, indicando que estas temperaturas sao mais eficazes em promover a germinacao. Levando-se em consideracao o tempo medio de germinacao, indice de velocidade de germinacao e producao de materia seca, as temperaturas constantes de 30 e 35[degrees]C se destacam, sendo seus resultados estatisticamente iguais e superiores aos demais tratamentos. Palavras-chave: matas calcarias; sementes florestais; especies nativas.