Drought stress effects on germination and reserve degradation of Aspidosperma polyneuron seeds

Rodrigues, Guilherme Almeida Garcia; Ribeiro, Maiara Iadwizak; Luz, Ezequiel Marçal Zanchetti da; Porto, Erly Carlos; Matias, Gabriele Larissa; Corsato, Jaqueline Malagutti; Fortes, Andréa Maria Teixeira

doi:10.5039/agraria.v14i4a5903

Cited by 5 publications

(5 citation statements)

References 35 publications

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“…As prolaminas são encontradas associada ao amido nos cereais, dessa forma a maioria das leguminosas apresentam baixas concentrações desta proteína (Souza et al 2012). Como observado por Rodrigues et al (2019), onde as sementes de Aspidosperma polyneuron Mül.Arg. se mantiveram com baixos valores dessa proteína.…”

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Curva de embebição, anatomia e mobilização de reservas em sementes de Mimosa flocculosa submetidas à superação de dormência

et al. 2021

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RESUMO -O trabalho teve como objetivo ampliar o conhecimento sobre a germinação de Mimosa flocculosa Burkart e eficiência dos tratamentos de superação de dormência com foco na embebição, mobilização de reservas, anatomia tegumentar e germinação das sementes. Foi realizada a curva de embebição e a partir desta, foi estipulado o perfil trifásico para os três tratamentos: controle, água a 80 °C por 10 minutos e ácido sulfúrico 98% por três minutos. Foram analisados durante a embebição os açúcares, proteínas e anatomia tegumentar das sementes, junto com a germinação, verificando: porcentagem, frequência e sincronização da germinação. Nossos resultados demonstraram que os dois métodos utilizados de superação de dormência nas sementes de M. flocculosa são indicados, pois estimularam uma curva de embebição mais uniforme, maior degradação de açúcares e proteínas, o tegumento destes tratamentos apresentou fissuras e desestruturações auxiliando a entrada de água, elevando a germinação e com tendência à sincronização.Palavras-chave: espécie nativa, germinação, tegumento duro ABSTRACT -Imbibition curve, anatomy and mobilization of reserves in seeds of Mimosa flocculosa Burkart submitted to overcoming of dormancy. This study aimed to expand knowledge about Mimosa flocculosa Burkart seed germination and efficiency of break dormancy treatments, focusing on hydration, reserves mobilization, integument anatomy and seed germination. We conducted a hydration curve, and from that, we stipulated a three-phase profile for each treatment: control, water at 80 ºC for 10 min and sulfuric acid 98% for 3 min. Sugars and proteins, integumentary anatomy and germination parameters (germination percentage, frequency and synchrony of germination) were analyzed during hydration. Our results showed that the overcoming dormancy methods used in M. floculosa seeds are indicated, since they improved germination, uniformed hydration, presented integument fissures and destabilizations increasing water uptake and germination synchrony.

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Section: Discussionunclassified

Curva de embebição, anatomia e mobilização de reservas em sementes de Mimosa flocculosa submetidas à superação de dormência

et al. 2021

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“…The results are reinforced by the structural changes observed in the seeds exposed to the dormancy overcome treatments, largely related to the cuticle removal and the damage to macrosclereid cells, which caused ruptures in the impermeable palisade layer. These ruptures promoted water uptake, which promotes tissue rehydration, and oxygen entrance, which intensifies the metabolic activities and the degradation of reserves within the seed, essential processes for embryonic axis growth (Rodrigues et al 2019).…”

Section: Discussionmentioning

confidence: 99%

“…The acceleration of the germination process is considered beneficial, since the faster seeds germinate, the less they will be exposed to adverse conditions and pathogen incidence, which may lead to tissue deterioration. Moreover, faster germination tends to be more synchronized, a desirable characteristic in seedling production (Joshi & Chinnusamy 2014, Rodrigues et al 2019.…”

Section: Discussionmentioning

confidence: 99%

Effect of seed coat rupture on the germination of Mimosa flocculosa Burkart (Leguminosae) seeds

Ribeiro

Rodrigues

Mathias

et al. 2020

Hoehnea

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Mimosa flocculosa Burkart is a native species used for the recovery of degraded areas. Large scale seedling production in nurseries is hindered due to seed physical dormancy. This study evaluated the germination and seed coat anatomy of M. flocculosa seeds subjected to dormancy overcome treatments. Seeds of M. flocculosa were subjected to: control with distilled water, heated water at 50, 80 and 100 °C, and H2SO4 for 1, 3 and 5 minutes. Germination tests were conducted with four replicates of 25 seeds in an entirely casualized delineation, analyzing germination percentage, mean germination time and germination speed index. Moreover, anatomical analysis of the seed coat was conducted. The treatments with heated water at 80 ºC, and sulfuric acid for 3 and 5 minutes promoted benefic anatomical alterations in the seed integument, reflecting in higher and faster in germination rates. Heated water at 80 ºC is recommended because of its efficiency and safety.

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“…Arg. seeds had germination capacity reduced as the osmotic potential became more negative (Rodrigues et al, 2019), not germinating below -0.6 MPa. In turn, the germination of Chamaecytisus palmensis (Christ) F.A.…”

Section: Figure 1 -Germination Speed Index (A) and Germination Percen...mentioning

confidence: 99%

Initial establishment of Erythrina velutina Willd seedlings under water deficit: physiological and biochemical aspects

Almeida,

Silva,

Gonçalves

et al. 2023

Rev. Bras. Ciênc. Ambient.

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For plant species to establish and survive in semiarid regions, such as the Caatinga plant domain, they need to present biochemical versatility. Thus, the objective of this study was to evaluate through physiological and biochemical indicators the sensitivity of seeds and seedlings of Erythrina velutina Willd to water deficit, as this species is used in the recovery of degraded areas in the Brazilian semiarid region. The seeds were submitted to five osmotic potentials (-0.1; -0.2; -0.3; -0.4; and -0.5 MPa), evaluating the percentage of germination (normal seedlings), germination speed index, length of aerial parts and root system, total dry mass, the concentration of photosynthetic pigments (chlorophylls a, b, and carotenoids) in aerial parts and root system, soluble carbohydrates and proteins, proline, and the enzymes ascorbate peroxidase, catalase, superoxide dismutase, peroxidase, and polyphenoloxidase. The water deficit reduced the germination speed index and percentage, aerial parts and root length, aerial parts and root dry mass, and photosynthetic pigment content in seedlings; however, there was an increase in the levels of total carbohydrate, proline, and protein, and a reduction in superoxide dismutase. The water potential from -0,4 MPa was a limiting factor for the seedling and/or seedling formation process. The direct sowing of E. velutina would only be indicated up to the potential of -0,3 MPa for the regeneration of degraded areas in semiarid regions. The species in the seedling formation stage present less biochemical plasticity to overcome limiting conditions of water availability.

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Drought stress effects on germination and reserve degradation of Aspidosperma polyneuron seeds

Cited by 5 publications

References 35 publications

Curva de embebição, anatomia e mobilização de reservas em sementes de Mimosa flocculosa submetidas à superação de dormência

Curva de embebição, anatomia e mobilização de reservas em sementes de Mimosa flocculosa submetidas à superação de dormência

Effect of seed coat rupture on the germination of Mimosa flocculosa Burkart (Leguminosae) seeds

Initial establishment of Erythrina velutina Willd seedlings under water deficit: physiological and biochemical aspects

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