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      Maturation of Eugenia pyriformis seeds under different hydric and thermal conditions

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          Abstract

          This study aims to analyze the maturation and dispersal of Eugenia pyriformis Cambess. seeds produced in different years, and the influence of variation in thermal and hydric environment on seed physical and physiological characteristics at dispersal. Fruits at different developmental stages were harvested in the city of São Paulo between 2003 and 2010, as well as in the cities of Campinas and Lavras, in 2009 and 2010 and analyzed for size and color. The seeds were extracted from the fruits and their dry mass, water content, germination and vigor were assessed. Results showed that seed maturation is unsynchronized to the maturation of the fruit, taking 45 days on average (430 growing degree-days), longer in rainy times or lower temperatures. Seeds with higher physiological quality were produced in rainy years and when the temperature range was larger. We concluded therefore that hydric and thermal environmental variations during development influence the maturation of Eugenia pyriformis seeds and are able to determine the formation cycle and the final seed quality.

          Translated abstract

          O presente estudo tem como objetivo analisar a maturação e a dispersão de sementes de Eugenia pyriformis Cambess. produzidas em diferentes anos, verificando a influência das variações hídricas e térmicas do ambiente sobre suas características físicas e fisiológicas no momento em que são dispersas. Frutos com diferentes estágios de desenvolvimento foram coletados da região de São Paulo, entre 2003 e 2010 e das regiões de Campinas e Lavras, em 2009 e 2010 e foram analisados quanto ao tamanho e à cor. As sementes foram extraídas dos frutos e analisadas quanto ao conteúdo de massa seca, teor de água, germinação e vigor. Os resultados evidenciaram que a maturação das sementes ocorre de forma dessincronizada à maturação dos frutos, levando em média 45 dias (430 graus-dia), sendo mais demorada em períodos chuvosos ou de temperaturas mais baixas. Sementes de qualidade fisiológica mais elevada foram produzidas em anos chuvosos e quando a amplitude térmica foi maior. Conclui-se, portanto, que as variações hídricas e térmicas do ambiente e do período de formação influenciam sobre a maturação das sementes de uvaieira podendo, inclusive, determinar o ciclo de formação e a qualidade final dessas sementes.

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          Most cited references 37

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          Regraspara análise de sementes

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            Speed of germination, an aid in selection and evaluation for seedling emergence and vigour

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              International rules for seed testing

              (1996)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                aabc
                Anais da Academia Brasileira de Ciências
                An. Acad. Bras. Ciênc.
                Academia Brasileira de Ciências (Rio de Janeiro )
                1678-2690
                March 2013
                : 85
                : 1
                : 223-233
                Affiliations
                [1 ] Instituto de Botânica Brazil
                [2 ] Prataviera Consultoria Brazil
                [3 ] Dow AgroSciences Industrial Ltda Brazil
                [4 ] Universidade Estadual Paulista Brazil
                [5 ] Instituto Agronômico Brazil
                [6 ] Universidade Federal de Lavras Brazil
                [7 ] Instituto de Botânica Brazil
                Article
                S0001-37652013000100223
                10.1590/S0001-37652013005000006

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

                Product
                Product Information: SciELO Brazil
                Categories
                MULTIDISCIPLINARY SCIENCES

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