Superação de dormência de sementes de Hymenaea stigonocarpa Mart. em laboratório

Souza, Thayane Rachel Borba de; Silva‐Cardoso, Inaê Mariê de Araújo; Souza, Anderson Marcos de

doi:10.12702/viii.simposfloresta.2014.14-18-1

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…That demonstrates the importance of scarification, especially in two seed positions, in the dormancy break of this species. Similarly, Souza et al (2014), testing the methods of dormancy breakage for this same species, verified that two scarifications also provided better results.…”

Section: Resultsmentioning

confidence: 66%

Overcoming dormancy in Dimorphandra mollis and Hymenaea stigonocarpa

Silva

Lima

et al. 2020

RSD

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A few years ago, concerns about the need to recover degraded areas and to restructure the landscape began. One of the difficulties to produce native seedlings, among several factors, is the dormancy of the seeds of some species because even in favorable environments the seeds do not germinate. The objective of this study was to evaluate the influence of different methods of overcoming dormancy in the emergence of two species of the Fabaceae family, native to the Cerrado of the northeast of Mato Grosso do Sul, Brazil. Seven treatments were used for both species, where there was a combination of scarification with immersion in water. The dormancy break methods applied to interfere with the germination percentage and the emergence velocity index for both species. To Dimorphandra mollis, the best treatment is a scarification opposite to the hilum followed by immersion in water for 9 hours. To Hymenaea stigonocarpa, the use of at least two scarifications followed by immersion in water favors the percentage of germinated seeds while, two lateral scarifications to the hilum, combined with immersion in water, favors the velocity of the emergence of these seeds.

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Section: Resultsmentioning

confidence: 66%

Overcoming dormancy in Dimorphandra mollis and Hymenaea stigonocarpa

Silva

Lima

et al. 2020

RSD

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“…Além disso, há poucos trabalhos (DE-CARVALHO et al, 2005;SOUZA et al, 2014) sobre a superação da dormência em sementes de H. stigonocarpa. De-Carvalho et al (2005) testaram tratamentos de escarificação mecânica, com e sem embebição em água, com melhor resultado para escariicação mecânica com embebição das sementes.…”

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“…Valores médios da porcentagem de germinação de sementes de Hymenaea stigonocarpa submetidas a diferentes tratamentos pré-germinativos. pré-germinativos em sementes de Hymenaea stigonocarpa contrapartida,Souza et al (2014) verii caram que a embebição das sementes de H. stigonocarpa em ácido sulfúrico por três minutos não foi ei ciente na superação da dormência. Provavelmente o tempo de embebição das sementes em ácido sulfúrico, neste último estudo, não foi adequado para se conseguir escarii car o tegumento…”

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Tratamentos pré-germinativos para sementes de Hymenaea stigonocarpa Mart. ex Hayne

et al. 2016

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http://dx.doi.org/10.5007/2175-7925.2016v29n4p1Hymenaea stigonocarpa, conhecida como jatobá-do-cerrado, pertence à família Fabaceae (Leguminosae) e está incluída na categoria de espécie “quase ameaçada de extinção”. Seus indivíduos ocorrem em áreas de cerrado e cerradão e suas sementes apresentam dormência física. Em razão dessa característica, este estudo teve por objetivo avaliar diferentes tratamentos pré-germinativos em sementes de H. stigonocarpa, sendo eles: imersão em fogo, ácido sulfúrico, ácido clorídrico, acetona, éter e água quente (100°C), além de escarificação mecânica com lixa e corte do tegumento com alicate de unha, lavagem em água corrente por 2 h. Os resultados obtidos pelos tratamentos foram comparados aos da testemunha, que não foi submetida a nenhum deles. Os parâmetros analisados foram: a porcentagem de germinação, o Índice de Velocidade de Germinação (IVG) e os percentuais de sementes duras e firmes e de sementes mortas. Os resultados obtidos foram: a) germinação: a água fervente e o ácido sulfúrico foram superiores aos da testemunha; b) IVG: a água fervente, o ácido sulfúrico, o fogo e a lixa foram superiores aos da testemunha; e c) não foram observadas diferenças estatísticas entre a testemunha e os demais tratamentos para o percentual de sementes mortas. Em vista disso, os tratamentos com a água fervente e o ácido sulfúrico se mostraram os melhores, considerando-se os parâmetros analisados.

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Weed control, large seeds and deep roots: Drivers of success in direct seeding for savanna restoration

Passaretti¹,

Pilon

Durigan

2020

Applied Vegetation Science

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AimWe aimed to evaluate the performance of native tree species in the restoration of savanna vegetation by direct seeding, to assess whether weed control and intercropping with native grasses can contribute to the success of this method and to determine whether species performance can be explained by functional traits.LocationCerrado biome, southeastern Brazil. Old fields abandoned after decades of land use as pasture or croplands, occupied by ruderal plants and invasive grasses.MethodsWe established a direct seeding experiment with ten tree species native to the cerrado (Brazilian savanna) region. We used a factorial design in five blocks, with the following factors: (a) species; (b) weed control and (c) intercropping with native grasses. We evaluated the emergence, survival and growth of plants, and through multiple regressions we sought to explain the success of the species in direct seeding based on their functional traits.ResultsEmergence and survival in the field varied widely among species but with little or no difference between treatments. Growth was compromised by weed competition in all species. Intercropping with native grasses did not decrease weed competition. We found a functional pattern associated with species performance in direct seeding, where survival in the field is positively associated with seed mass, root depth and a greater root:shoot ratio.ConclusionWeed competition impairs seedling growth more than survival, considerably delaying restoration by direct seeding. The success of this method in the savanna will depend on the use of species that are best adapted to environments where water stress is the main obstacle to overcome and have large seeds and seedlings with a large and deep root system. Characterizing underground seedling systems is essential for predicting the success of cerrado species in direct seeding.

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Superação de dormência de sementes de Hymenaea stigonocarpa Mart. em laboratório

Cited by 3 publications

References 4 publications

Overcoming dormancy in Dimorphandra mollis and Hymenaea stigonocarpa

Overcoming dormancy in Dimorphandra mollis and Hymenaea stigonocarpa

Tratamentos pré-germinativos para sementes de Hymenaea stigonocarpa Mart. ex Hayne

Weed control, large seeds and deep roots: Drivers of success in direct seeding for savanna restoration

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