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      Qualea grandiflora Mart.: TEMPERATURA NA GERMINABILIDADE DE SEMENTES Translated title: Qualea grandiflora Mart.: TEMPERATURE ON SEED GERMINATION CAPABILITY

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          Abstract

          RESUMO Qualea grandiflora Mart. ocorre em matas de galeria e cerrado, sendo conhecida popularmente como pau- terra. Com o objetivo de obter informações sobre a propagação reprodutiva dessa espécie foi estudado o efeito da temperatura sobre a germinabilidade das sementes. As temperaturas utilizadas foram: 15, 20, 25, 30, 35 e 40 ºC. As sementes foram semeadas em substrato papel-toalha, na forma de rolo, com quatro repetições, sendo a unidade experimental constituída por um rolo com 25 sementes. O experimento seguiu o delineamento inteiramente casualizado com seis tratamentos e quatro repetições. Houve emissão de raiz primária em temperaturas de 15 a 40 ºC. Valores entre 78 e 93 % foram obtidos numa ampla faixa de temperaturas, entre 15 e 35 ºC. A formação de plântulas normais ocorreu em faixa mais restrita, entre 20 e 35 ºC. A protrusão de raiz iniciou no sétimo dia após a semeadura, exceto a 15 ºC que proporcionou um processo lento e gradativo, iniciando no décimo quarto dia após a incubação. A 40 ºC a germinabilidade foi inferior a 15 % e não houve formação de plântulas normais. Para germinação de sementes de pau-terra, recomenda-se a faixa de temperatura entre 20 e 30 ºC.

          Translated abstract

          ABSTRACT Qualea grandiflora Mart. occurs in riverine forests and in 'cerrado' areas, popularly known as 'pau- terra'. With the purpose of obtaining information about the reproductive spread of this species, it was studied the effect of temperature on seed germination capability. The temperatures used were: 15, 20, 25, 30, 35 and 40 ºC. The seeds were sown on paper towel in roll form, with four replicates of one experimental unit consisted of a roll with 25 seeds. The experiment followed a completely randomized design with six treatments and four replications. There was primary root emission at temperatures of 15 to 40 ºC. Values between 78 % and 93 % were obtained in a wide range of temperatures between 15 and 35 ºC. A normal seedling occurred in narrower range, between 20 and 35 ºC. The protrusion of the root began on the seventh day after sowing, except the 15 ºC which provided a slow and gradual process, beginning on the fourteenth day after hatching. At 40 ºC, the germination capability was less than 15 % and there was no normal seedling. For the seed germination of 'pau-terra', it is recommended that the temperature range between 20 and 30 ºC.

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          Most cited references 23

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          Fisiologia de sementes de plantas cultivadas

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            The cerrado vegetation of Brazil

             George Eiten (1972)
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              Árvores brasileiras: manual de identificação e cultivo de plantas arbóreas nativas do Brasil

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                cflo
                Ciência Florestal
                Ciênc. Florest.
                Universidade Federal de Santa Maria
                1980-5098
                March 2013
                : 23
                : 1
                : 245-251
                Affiliations
                [1 ] Universidade Federal de Mato Grosso Brazil
                [2 ] Universidade Federal de Mato Grosso Brazil
                [3 ] Universidade Federal de Mato Grosso Brazil
                S1980-50982013000100245
                10.5902/198050988458

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                Product
                Product Information: SciELO Brazil
                Categories
                ECOLOGY
                ENVIRONMENTAL STUDIES
                FORESTRY

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