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Germinação de sementes de Parkia pendula (Willd.) Benth. ex Walp. (fabaceae) em diferentes temperaturas Germination of Parkia pendula (Willd.) Benth. ex Walp. (fabaceae) seeds in different temperatures

By Jociane Rosseto, Maria Cristina de Figueiredo e Albuquerque, Rubens Marques Rondon Neto and Ivan Cleiton de Oliveira Silva

Abstract

Parkia pendula (Willd.) Benth. ex Walp. é uma espécie arbórea da Amazônia brasileira, pertencente à família Fabaceae, de importância regional, porém pouco conhecida, considerando-se as informações técnicas, mas muito explorada comercialmente. O objetivo deste trabalho foi avaliar a germinação das sementes em diferentes temperaturas. As sementes foram submetidas às temperaturas constantes de 15, 20, 25, 30, 35 e 40 ºC com quatro repetições de 25 sementes, colocadas para germinar em papel-toalha, na forma de rolo, mantidos em sacos plásticos transparentes em câmara de germinação sob fotoperíodo de 8 h. Foi utilizado o delineamento inteiramente casualizado com seis tratamentos e quatro repetições. A germinação foi avaliada durante sete dias, sendo consideradas germinadas as sementes que emitiram raízes maiores que 5 mm e as que formaram plântulas normais. Analisaram-se as seguintes características: germinação (%), tempo médio de germinação e formação de plântulas normais, comprimento e massa seca de plântulas. Verificou-se que as sementes de Parkia pendula germinaram em todas as temperaturas estudadas. Entretanto, a formação de plântulas foi inibida nas temperaturas de 15, 20 e 40 ºC. A temperatura de 30 ºC foi considerada a mais favorável para a germinação e formação de plântulas dessa espécie.<br>The Parkia pendula (Willd.) Benth. ex Walp. is a forest species of the Brazilian Amazon, belonging to the Fabaceae family, of regional importance. However, little is known about its species, despite its common commercial use. The objective of this work was to evaluate the germination of seeds in different temperatures. Temperatures of 15, 20, 25, 30, 35 and 40 ºC were utilized. The six treatments were completely randomized, with four repetitions of 25 seeds kept in paper towel to germinate and kept in transparent plastic bags in a germination chamber with photoperiod of eight hours. The method used was completely randomized with six treatments and four repetitions. Germination was evaluated during seven days, being considered germinated the seeds that had emitted normal, larger than 5mm roots and that, at the same time, led to seedling formation. The following characteristics were analyzed: germination (%), average time for germination and normal formation of seedlings, seedling height and seedling dry matter. It was verified that the seeds of Parkia pendula can germinate at the temperatures of 15, 20, 25, 30, 35 and 40 ºC; however, temperatures of 15, 20 and 40 ºC reduced the number of seedlings. At 30 ºC, germination and number of seedlings of this species were maximized

Topics: Sementes florestais, análise de sementes, viabilidade, Forest seeds, seed analysis, viability, LCC:Forestry, LCC:SD1-669.5, LCC:Agriculture, LCC:S, DOAJ:Forestry, DOAJ:Agriculture and Food Sciences
Publisher: Sociedade de Investigações Florestais
Year: 2009
DOI identifier: 10.1590/S0100-67622009000100006
OAI identifier: oai:doaj.org/article:88b72274ea9941608ed696d5809dc15b
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