Physical and physiological aspects of seeds of<i>Fimbristylis dicothoma</i>as related to germination and dormancy

Mendonça, Giovana Soares de; Martins, Cibele Chalita; Martins, D.; Lopes, Maria Teresa Gomes

doi:10.5935/1806-6690.20150036

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…Thus, at the time of harvesting, the plot contained heterogeneous seeds in terms of color, size, and density (Mendonça, Martins, Martins, & Lopes, 2015). For other species of the same family such as Plathymenia foliolosa Benth (Fonseca, Freitas, Mendonça, Souza, & Abdalla, 2013) and Caesalpinia echinata Lam.…”

Section: Resultsmentioning

confidence: 99%

Seed and seedling morphology of Bauhinia scandens L.

Jeromini¹,

Basf²,

Silva³

et al. 2021

Semina: Ciênc. Agrár.

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Bauhinia scandens has potential importance as an ornamental and medicinal plant. Researchers have isolated and identified 1-O-alkylglycerol in the leaves of the B. scandens plant, and established antitumor properties using the Brine Shrimp toxicity test, an internationally accepted bioassay. Although this species has high potential, little is known about the viability of seedling production and the morphology of these plants, particularly in terms of seed characteristics and initial stages of germination. The objective of this study was to characterize the seed morphology, germination, and seedlings of B. scandens. Seed water content, weight, and coloration were evaluated. This study also included a description of seed biometrics, external and internal structures, germination, and seedling morphology. Internal seed morphology was evaluated by the anatomical sectioning and X-ray methods. The morphology data obtained were subjected to descriptive statistical analysis and germination data were determined using Cramér’s V. B. scandens seeds have a coloration ranging from very dark grayish-red to dark reddish-brown, flat oblong shapes, and rounded bases and apexes with full or slightly undulating margins. Healthy seedlings are produced mainly by seeds with well-formed internal structures. The reddish petiole of the seedling leaves is a taxonomic character for B. scandens identification. The non-domestication and genetic variability of this species reflect on the seed and seedling color and size variation.

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Section: Resultsmentioning

confidence: 99%

Seed and seedling morphology of Bauhinia scandens L.

Jeromini¹,

Basf²,

Silva³

et al. 2021

Semina: Ciênc. Agrár.

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Potassium nitrate to overcome dormancy of Urochloa humidicola Comum seeds

Pereira

Jeromini

Neves

et al. 2021

Semina: Ciênc. Agrár.

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The main difficulty with propagating Urochloa humidicola Comum is the high percentage of seed dormancy. Thus, the objective of this study was to develop a treatment to overcome seed dormancy and promote seed germination of this species that can be applied at a large scale. This study was conducted in two stages. First, the following treatments were evaluated using one seed lot: control (without treatment), immersion in H2SO4 (98%, 36N) for 10 min, moistening the germination substrate with KNO3 (0.2%) and immersion in KNO3 at concentrations of 0%, 2%, 4%, 6%, and 8% for periods of 12, 24, 36, and 48 h, followed by drying in the shade. In the second stage, three seed lots were evaluated in all of the aforementioned treatments, except for those of immersion in 0% KNO3 and of all concentrations for 36 and 48 h. The seeds were evaluated for water content, germination, percentage of abnormal seedlings, dead and dormant seeds, first count, and average germination time. Immersion in the KNO3 solution was efficient in overcoming dormancy and promoting germination. To be used by companies, the immersion of seeds in a 4% KNO3 solution for 24 h was the most suitable treatment to overcome dormancy and promote the germination of U. humidicola Comum seeds.

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MORPHOMETRIC CHARACTERIZATION AND OVERCOMING OF DORMANCY BY CHEMICAL AGENT IN SEEDS OF Senna multijuga (Rich.)

Silva¹,

Guilherme²,

Santos³

2016

RUVRV

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Senna multijuga (Rich) is a species of the Leguminosae family. Its importance resides in its wide used in reforestation of degraded areas. However, its seeds has a long dormancy period. The objective of this study was to characterize the morphology of the seeds of S. multijuga and evaluate the influence of sulfuric acid as a chemical agent in overcoming its dormancy. The seeds were characterized by nine morphometric measurements. The effectiveness of sulfuric acid in breaking dormancy was evaluated at two concentrations (80% and 90%) and in four times of immersion (10, 15, 20, 25 min.). Response variables observed were germination percentage, germination speed index (GSI), initial seedling growth (root and shoot length). S. multijuga presented small, elongated, little spherical seeds with a low moisture content. Seeds exposed to treatment with 90% sulfuric acid and immersed for 10 minutes showed better results for percentage of germination and GSI without negative effects such as the integrity of the initial growth of seedlings. Thus, sulfuric acid is effective in breaking dormancy S. multijuga and optimization proposal reduces by about 10% in the consumption of acid, keeping a short time by immersion pretreatment and high germination viability.

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Physical and physiological aspects of seeds ofFimbristylis dicothomaas related to germination and dormancy

Cited by 3 publications

References 11 publications

Seed and seedling morphology of Bauhinia scandens L.

Seed and seedling morphology of Bauhinia scandens L.

Potassium nitrate to overcome dormancy of Urochloa humidicola Comum seeds

MORPHOMETRIC CHARACTERIZATION AND OVERCOMING OF DORMANCY BY CHEMICAL AGENT IN SEEDS OF Senna multijuga (Rich.)

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