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      Physiological and biochemical changes in Cedrela fissilis seeds during storage Translated title: Alterações fisiológicas e bioquímicas de sementes de Cedrela fissilis durante o armazenamento

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          Abstract

          Abstract: The objective of this work was to evaluate the effect of storage on the physiological quality of cedar (Cedrela fissilis) seeds, as well as to correlate the germination and vigor of the seeds with their main biochemical changes. The experiments were carried out in a completely randomized design, in a 3×5 factorial arrangement (three environments × five storage periods). Seeds were stored for 0, 135, 280, 381, and 515 days in: a humidity chamber at 5±2ºC and 80% relative humidity, a drying chamber at 20±2ºC and 60% relative humidity, and an uncontrolled environment (laboratory) at 16±10ºC and 60±25% relative humidity. In all storage periods, the content of moisture on a wet basis and the percentages of proteins, lipids, total carbohydrates, and ash were evaluated. For the viability and vigor tests, the percentage of germination and mean germination time were calculated. At sampling time, seeds showed 11.5% water content, 85.5% germination, and mean germination time of 13.5 days, and all were negatively influenced by storage period. Protein percentage showed a downward trend, while that of carbohydrates increased as the storage period was extended. Seed germination and vigor reduce drastically with storage.

          Translated abstract

          Resumo: O objetivo deste trabalho foi avaliar o efeito do armazenamento na qualidade fisiológica de sementes de cedro (Cedrela fissilis), bem como correlacionar a germinação e o vigor das sementes com suas principais alterações bioquímicas. Os experimentos foram conduzidos em delineamento inteiramente casualizado, em arranjo fatorial 3×5 (três ambientes × cinco períodos de armazenamento). As sementes foram armazenadas por 0, 135, 280, 381 e 515 dias, em: câmara úmida a 5±2ºC e 80% de umidade relativa, câmara seca a 20±2ºC e 60% de umidade relativa e ambiente não controlado (laboratório) a 16±10ºC e 60±25% de umidade relativa. Em todos os períodos de armazenamento, foram avaliados o teor de umidade em base úmida e as percentagens de proteínas, lipídios, carboidratos totais e cinzas. Para os testes de viabilidade e vigor, foram calculados percentagem de germinação e tempo médio de germinação. No momento da coleta, as sementes apresentaram 11,5% de água, 85,5% de germinação e tempo médio de germinação de 13,5 dias, e todas foram negativamente influenciadas pelo período de armazenamento. A percentagem de proteína mostrou tendência de queda, enquanto a de carboidratos aumentou com o aumento do período de armazenamento. A germinação e o vigor das sementes reduzem drasticamente com o armazenamento.

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          Most cited references40

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          Proteome-wide characterization of seed aging in Arabidopsis: a comparison between artificial and natural aging protocols.

          A variety of mechanisms have been proposed to account for the extension of life span in seeds (seed longevity). In this work, we used Arabidopsis (Arabidopsis thaliana) seeds as a model and carried out differential proteomics to investigate this trait, which is of both ecological and agricultural importance. In our system based on a controlled deterioration treatment (CDT), we compared seed samples treated for different periods of time up to 7 d. Germination tests showed a progressive decrease of germination vigor depending on the duration of CDT. Proteomic analyses revealed that this loss in seed vigor can be accounted for by protein changes in the dry seeds and by an inability of the low-vigor seeds to display a normal proteome during germination. Furthermore, CDT strongly increased the extent of protein oxidation (carbonylation), which might induce a loss of functional properties of seed proteins and enzymes and/or enhance their susceptibility toward proteolysis. These results revealed essential mechanisms for seed vigor, such as translational capacity, mobilization of seed storage reserves, and detoxification efficiency. Finally, this work shows that similar molecular events accompany artificial and natural seed aging.
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            Seed longevity: survival and maintenance of high germination ability of dry seeds.

            The seed constitutes the main vector of plant propagation and it is a critical development stage with many specificities. Seed longevity is a major challenge for the conservation of plant biodiversity and for crop success. Seeds possess a wide range of systems (protection, detoxification, repair) allowing them to survive in the dry state and to preserve a high germination ability. Therefore, the seed system provides an appropriate model to study longevity and aging.
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              Production of mice through intracytoplasmic injection of sperm or spermatogenic cells

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                Author and article information

                Journal
                pab
                Pesquisa Agropecuária Brasileira
                Pesq. agropec. bras.
                Embrapa Secretaria de Pesquisa e Desenvolvimento; Pesquisa Agropecuária Brasileira (Brasília, DF, Brazil )
                0100-204X
                1678-3921
                2020
                : 55
                : e01309
                Affiliations
                [3] Colombo Paraná orgnameEmbrapa Florestas Brazil ivar.wendling@ 123456embrapa.br
                [2] Ponta Grossa Paraná orgnameUniversidade Estadual de Ponta Grossa orgdiv1Departamento de Fitotecnia e Fitossanidade Brazil castuepp@ 123456uepg.br
                [1] Curitiba Paraná orgnameUniversidade Federal do Paraná orgdiv1Centro de Ciências Florestais e da Madeira Brazil d_silva@ 123456globo.com
                Article
                S0100-204X2020000104100 S0100-204X(20)05500004100
                10.1590/s1678-3921.pab2020.v55.01309
                528eb1ad-addf-4757-bd6d-6db081908b0d

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

                History
                : 25 February 2019
                : 30 September 2020
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 40, Pages: 0
                Product

                SciELO Brazil

                Categories
                Seed Technology

                cedro-rosa,Cedrela fissilis,sementes florestais,componentes bioquímicos,condições de armazenamento de sementes,pink cedar,seed storage conditions,forest seeds,biochemical components

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