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      Germination of Miconia ligustroides (Melastomataceae) diaspores submitted to different treatments for dormancy overcoming Translated title: Germinação de diásporos de Miconia ligustroides (Melastomataceae) submetidos a diferentes tratamentos de superação de dormência

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          Abstract

          To assess the germination behavior of Miconia ligustroides (DC.) Naudin, diaspores were submitted to different regimes of temperature, light and substrate. Due to intrinsic low germination of the diaspores, they were submitted to treatments that aimed to overcome endogenous and exogenous dormancy. Miconia ligustroides presents complex dormancy and to overcome it is recommended to soak the diaspores in H2SO4 diluted at 75% for 5 minutes, wash it and then soak it in a solution of 400 mg L-1 of GA3 for 12 hours. Seeding should be done on Germtest® paper at 25 °C.

          Translated abstract

          Para avaliar o comportamento germinativo de Miconia ligustroides (DC.) Naudin, diásporos foram submetidos a diferentes regimes de temperatura, luz e substrato. Devido à baixa germinabilidade dos diásporos, foram realizados tratamentos de superação de dormência endógena e exógena. Miconia ligustroides apresenta dormência complexa e para superá-la recomenda-se a imersão dos diásporos em H2SO4 diluído a 75% por 5 minutos, seguida de lavagem e embebição em solução de 400 mg L-1 de GA3 por 12 horas. A semeadura deve ser realizada em papel Germtest® à 25 °C.

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          Most cited references36

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          Speed of Germination—Aid In Selection And Evaluation for Seedling Emergence And Vigor1

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            High temperature-induced abscisic acid biosynthesis and its role in the inhibition of gibberellin action in Arabidopsis seeds.

            Suppression of seed germination at supraoptimal high temperature (thermoinhibiton) during summer is crucial for Arabidopsis (Arabidopsis thaliana) to establish vegetative and reproductive growth in appropriate seasons. Abscisic acid (ABA) and gibberellins (GAs) are well known to be involved in germination control, but it remains unknown how these hormone actions (metabolism and responsiveness) are altered at high temperature. Here, we show that ABA levels in imbibed seeds are elevated at high temperature and that this increase is correlated with up-regulation of the zeaxanthin epoxidase gene ABA1/ZEP and three 9-cis-epoxycarotenoid dioxygenase genes, NCED2, NCED5, and NCED9. Reverse-genetic studies show that NCED9 plays a major and NCED5 and NCED2 play relatively minor roles in high temperature-induced ABA synthesis and germination inhibition. We also show that bioactive GAs stay at low levels at high temperature, presumably through suppression of GA 20-oxidase genes, GA20ox1, GA20ox2, and GA20ox3, and GA 3-oxidase genes, GA3ox1 and GA3ox2. Thermoinhibition-tolerant germination of loss-of-function mutants of GA negative regulators, SPINDLY (SPY) and RGL2, suggests that repression of GA signaling is required for thermoinibition. Interestingly, ABA-deficient aba2-2 mutant seeds show significant expression of GA synthesis genes and repression of SPY expression even at high temperature. In addition, the thermoinhibition-resistant germination phenotype of aba2-1 seeds is suppressed by a GA biosynthesis inhibitor, paclobutrazol. We conclude that high temperature stimulates ABA synthesis and represses GA synthesis and signaling through the action of ABA in Arabidopsis seeds.
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              Temperature perception and signal transduction in plants.

              Plants can show remarkable responses to small changes in temperature, yet one of the great unknowns in plant science is how that temperature signal is perceived. The identity of the early components of the temperature signal transduction pathway also remains a mystery. To understand the consequences of anthropogenic environmental change we will have to learn much more about the basic biology of how plants sense temperature. Recent advances show that many known plant-temperature responses share common signalling components, and suggest ways in which these might be linked to form a plant temperature signalling network.
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                Author and article information

                Journal
                rbb
                Brazilian Journal of Botany
                Braz. J. Bot.
                Sociedade Botânica de São Paulo (São Paulo, SP, Brazil )
                0100-8404
                1806-9959
                September 2011
                : 34
                : 3
                : 335-341
                Affiliations
                [01] Viçosa MG orgnameUniversidade Federal de Viçosa orgdiv1Departmento de Biologia Brazil
                [02] Lavras MG orgnameUniversidade Federal de Lavras orgdiv1Departmento de Biologia Brazil
                Article
                S0100-84042011000300008 S0100-8404(11)03400308
                b3988985-8104-49df-ba89-42477afd190b

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

                History
                : 10 June 2011
                : 01 March 2011
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 37, Pages: 7
                Product

                SciELO Brazil

                Categories
                Articles

                jacatirão-do-brejo,germinabilidade,dormência complexa,germinability,complex dormancy

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