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      Influência da temperatura e do substrato na germinação de sementes de itaubarana (Acosmium nitens (Vog.) Yakovlev) - Leguminosae, Caesalpinoideae Translated title: Influence of temperature and substrate on seeds germination of itaubarana (Acosmium nitens (Vog.) Yakovlev) - Leguminosae, Caesalpinoideae

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          Abstract

          Acosmium nitens (Vog.) Yakovlev (Itaubarana), Leguminosae Caesalpinoideae, é uma espécie madeireira e ocorre em áreas inundáveis da Amazônia. O objetivo deste trabalho foi estudar a germinação de sementes de itaubarana sob diferentes condições de temperatura e substrato, utilizando-se como parâmetros a porcentagem e o tempo médio de germinação. Realizou-se um experimento, de acordo com o fatorial 4x3, nas temperaturas constantes de 20, 25, 30 e 35°C e utilizando os substratos sobre areia (S.A), sobre papel (S.P) e sobre vermiculita (S.V). O delineamento estatístico empregado foi o inteiramente casualizado em esquema fatorial, com quatro repetições de 25 sementes por tratamento. Os resultados demonstraram que não ocorreu germinação das sementes quando semeadas sobre papel nas temperaturas de 30 e 35°C. Para o substrato vermiculita, em todas as temperaturas testadas, foram observadas altas taxas de germinação das sementes com valores variando de 87 a 97%. A temperatura de 30°C juntamente com o substrato vermiculita mostrou-se mais adequada para a germinação das sementes; nesta condição foi obtida a maior taxa de germinação (97%) com tempo médio de aproximadamente 5,0 dias. Para o substrato sobre areia, as temperaturas de 20, 25 e 30°C proporcionaram maiores porcentagens de germinação das sementes quando comparadas com a temperatura de 35°C. Para as temperaturas de 30 e 35°C, o substrato sobre vermiculita proporcionou maior taxa de germinação quando comparado aos demais substratos.

          Translated abstract

          Acosmium nitens (Vog.) Yakovlev (Itaubarana), Leguminosae Caesalpinoideae, is an important timber species, which occurs in "varzea" (annualy flooded) Amazonian forests. This paper deals with germination rates of itaubarana, which were determined for seeds sown under different temperature and substrate conditions. The mean time lenght for germination was also included as measurement parameters. The experiment was carried out using a two-factor design with balanced data considering the effects of constant temperatures (20, 25, 30 e 35°C) and substrates (sand, paper and vermiculite) on the germination rates. Each level was replicated four times, and each replication contained twenty-five seeds. The results showed that seeds did not germinated when they were sown over paper at temperatures of 30 and 35°C. High seed germination rates were observed on the substrate over vermiculite at all temperatures tested, with rates ranging from 87 to 97%. The combination of temperature of 30°C and substrate over vermiculite showed to be adequate for seed germination; under this condition, the highest germination rate (97%) was obtained with a mean time lengh of approximately 5,0 days. For substrate over sand, temperatures of 20, 25 and 30°C provided the highest seed germination rates when compared with a temperature of 35°C. For temperatures of 30 and 35°C, the substrate over vermiculite provided the highest germination rate when compared with the other substrates.

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          Most cited references 23

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          Regras para análise de sementes

           E Elli,  M. Bensch,  J. Waquim (1992)
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            Fisiologia da semente

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              • Record: found
              • Abstract: not found
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              The use of transformations.

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                aa
                Acta Amazonica
                Acta Amaz.
                Instituto Nacional de Pesquisas da Amazônia (Manaus )
                1809-4392
                2005
                : 35
                : 1
                : 35-39
                Affiliations
                [1 ] Instituto Nacional de Pesquisas da Amazônia Brazil
                Article
                S0044-59672005000100006
                10.1590/S0044-59672005000100006

                http://creativecommons.org/licenses/by/4.0/

                Product
                Product Information: SciELO Brazil
                Categories
                AGRONOMY
                BIOLOGY
                ZOOLOGY

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