Tratamentos para superar a dormência de sementes de &lt;em&gt;Acacia mangium&lt;/em&gt; Willd

Kohl, Marilda Cervi; Pedrinho, Denise Renata; Arias, Edison Rubens Arrabal; Favero, Silvio

doi:10.4025/actasciagron.v30i2.1786

Cited by 8 publications

(1 citation statement)

References 1 publication

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“…Acacia mangium seeds were harvested in the region of Ipameri, Goiás. Initially, the seeds were treated with hot-water washing, during 60 seconds, due to integumentary numbness in seeds (Mapa, 2009;Rodrigues et al, 2008). Treated seeds were planted in plastic tubes (volume of 53 cm 3 ) using a commercial substrate (Carolina Soil®; base of sphagnum peat, expanded vermiculite, and rice hulls).…”

Section: Materials and Methodsexperiments Characterizationmentioning

confidence: 99%

September 2022

2022

Aust J Crop Sci

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Even though Acacia mangium is able to perform Nitrogen Biological Fixation (NBF), seedlings are grown under N-fertilizer application during the initial stages of seedlings. The hypothesis tested herein is that the N supplying for Acacia seedling until the establishment of the symbiosis relationship is a required practice to enhance seedlings growth, N accumulation and Nitrogen Use Efficiency (NUE). In this sense, the goal of this study was to evaluate the implications of increasing N rates on Acacia seedlings' growth and nutritional status in earlier stages of growth. The study was performed along four months in greenhouse with increasing N rates (0, 50, 100 and 200 mg dm -3 ) applied in pots. Plant parameters evaluated included: collar diameter, height, number of leaves, shoot and root dry matter. Plant nutritional status was evaluated through N content in leaves and NUE at the end of the trial. Findings herein showed that increased N rates applied enhanced all plant parameters, as follow: height (+53%), coller diameter (+43%), number of leaves (+70%) and shoot (+52%) and roots (+68%) dry matter production. Overall, increasing N rates promoted linear increasing on plant growth. Moreover, the N rates applied also improved the N content into the leaves, stem and roots in 55, 41 and 82%, respectively. The NUE was enhanced from 1.7 to 3.9 g mg -1 and plant dry matter was correlated with N content (r = 0.88). The findings herein indicate that N uptaken by plants was efficiently converted into dry matter. The high-N rates promoted higher N accumulation in roots (leaves>roots>stem) with a reduction in N fluxes, while N-low rates increased N fluxes and a reduction of N accumulation in roots (leaves>stem>roots) was observed. Based on our results, the N supplying during Acacia seedlings' earlier stages, when seedlings are not able to perform NBF, was a promising strategy to increase plant growth as well as enhancing NUE by plants.

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Section: Materials and Methodsexperiments Characterizationmentioning

confidence: 99%

September 2022

2022

Aust J Crop Sci

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Sewage sludge assessment on growth of Acacia mangium seedlings by principal components analysis and orthogonal contrasts

Caldeira

Favalessa

Delarmelina

et al. 2018

Journal of Plant Nutrition

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Water absorption and improvement of methods for electrical conductivity test in acacia seeds

Oliveira

Smiderle

Paulino

et al. 2016

RBT

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Abstract:Acacia is an important forest species of rapid growth whose seeds have tegument dormancy. In this work it was intended to characterize water absorption pattern after seed dormancy break, and to determine the amount of water, container size and the need of breaking the tegument dormancy, as to perform electrical conductivity test in small and large seeds of Acacia mangium (Fabaceae). The seeds were collected from 10, 8 and 6 years old trees established in poor yielding-capacity soils on savannah areas of Roraima, Brazil; seeds were classified in six lots concerning to seed size and tree age. Germination tests (50 seeds and four replications per lot) were carried out on germitest® paper maintained on gerbox at 25 °C. Imbibition was verified by seed weighing at different times (0, 2, 5, 8, 12, 16, 24, 36, 48, 60, 72, 84, 96 and 120 hours). The electrical conductivity test consisted of three experiments, distinguished by the amount of water used and by the container size in which seeds were immersed. Seeds of A. mangium coming from 10 years old trees presented increased germination percent and germination speed than seeds of six-year old trees. Small seeds presented increased in electrical conductivity and water absorption until 120 hours when compared to large seeds. The immersion of seeds of A. mangium in 40 mL of distilled water into 180 mL plastic containers, after dormancy break, it is indicated for the determination of electrical conductivity test. The ratio of electrolytes by seed mass, after 24 hours of immersion in water, turns electrical conductivity test more accurate concerning A. mangium seeds. Rev. Biol. Trop. 64 (4): 1651-1660. Epub 2016 December 01.

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Tratamentos para superar a dormência de sementes de <em>Acacia mangium</em> Willd

Cited by 8 publications

References 1 publication

September 2022

September 2022

Sewage sludge assessment on growth of Acacia mangium seedlings by principal components analysis and orthogonal contrasts

Water absorption and improvement of methods for electrical conductivity test in acacia seeds

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