Avaliação de Panicum maximum jacq. para tolerância ao alumínio em solução nutritiva

Almeida, Ana Aparecida da Silva; Monteiro, Francisco Antônio; Jank, Liana

doi:10.1590/s0100-06832000000200011

Cited by 12 publications

(12 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These results corroborate with reports in the literature in which the aluminum phytotoxicity is a phenomenon that influences the apical meristem of the roots and the cell elongation region, inhibiting mitosis, with immediate reflections in the root system (Almeida et al, 2000).…”

Section: Resultssupporting

confidence: 92%

“…The evaluated genotypes presented distinct levels of aluminum tolerance and sensitivity. The variability of aluminum toxicity tolerance had already been observed in another forage species, Panicum maximum, by Almeida et al (2000) and Oliveira et al (2000). Those authors reported differences in the growth of the main root of genotypes grown in solutions with and without aluminum.…”

Section: Resultsmentioning

confidence: 77%

“…In aluminum toxicity studies on grasses, Papernik & Kochian (1997) and Almeida et al (2000) used plants cultivated in containers with nutritive solution. Miyazawa et al (1993), on the other hand, immersed soils from eight Brazilian locations in distilled water, and extracted the solution which received different concentrations of types of toxic aluminum, determined by a potentiometer with fluoride selective electrode.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Aluminum tolerance on genotypes of signal grass

Bitencourt

Chiari²,

Laura³

et al. 2011

R. Bras. Zootec.

View full text Add to dashboard Cite

-The objective of this work was to evaluate aluminum tolerance of five genotypes of Urochloa decumbens (D24, CD24-2, CD24-27, CD24-45 e D62) and five genotypes of Urochloa ruziziensis (R30, R44, R46, R50 and R125) in hydroponic system. Uniform tillers were collected from these genotypes and transferred to two solutions: solution 1 (200 μM CaCl 2 , pH 4.2) and solution 2 (200 μM CaCl 2 + 200 μM AlCl 3 , pH 4.2). Twenty-one days later, the roots of the plants were separated, stained and digitalized for analysis of the length and diameter of the main root. The experiment was conducted in a completely randomized design, in factorial (genotypes × doses) with three replications. A significant interaction occurred between genotype and dose for length and width of the main root, and the results presented in average, a significant difference for most genotypes. The means of main root length in the absence and presence of aluminum were not significant for D62 (U. decumbens cv. Basilisk), CD24-45 and R46. Means were not significant for the diameter of the main root for CD24-2, CD24-27 and D62. Genotype D62 was the only one classified as tolerant to aluminum and R50 the only one classified as sensitive. Most evaluated genotypes showed medium to low tolerance. This classification was based on confidence intervals (IC 99%) for the mean of the relative tolerance indices estimated for length and diameter of the main root. These results can be used in the choice of progenitors aiming at developing segregating populations for studies of inheritance and mapping of genes and/or loci related to aluminum tolerance in Urochloa.Key Words: abiotic stresses, acid soils, forages, Urochloa decumbens, Urochloa ruziziensis Tolerância ao alumínio em genótipos de capim-braquiária RESUMO -O objetivo neste trabalho foi avaliar a tolerância ao alumínio de cinco genótipos de Urochloa decumbens (D24, CD24-2, CD24-27, CD24-45 e D62) e cinco de Urochloa ruziziensis (R30, R44, R46, R50 e R125) em cultivo hidropônico. Desses genótipos, foram coletados perfilhos uniformes que foram transferidos para duas soluções: solução 1 (200 μM CaCl 2 , pH 4,2) e solução 2 (200 μM CaCl 2 + 200 μM AlCl 3 , pH 4,2). Após 21 dias, as plantas tiveram suas raízes separadas, coradas e digitalizadas para análise do comprimento da raiz principal e do diâmetro da raiz principal. O experimento foi realizado em delineamento inteiramente casualizado, em fatorial (genótipos × doses) com três repetições. Houve interação significativa entre genótipo e dose para comprimento e diâmetro da raiz principal, cujos resultados apresentaram, na média, diferença significativa para a maioria dos genótipos. As médias de comprimento da raiz principal na ausência e na presença de alumínio não foram significativas para D62 (Urochloa decumbens cv. Basilisk), CD24-45 e R46. Para diâmetro da raiz principal, as médias não foram significativas para CD24-2, CD24-27 e D62. O genótipo D62 foi o único classificado como tolerante ao alumínio e o R50, o único sensível. A maior parte dos genótipos ...

show abstract

Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Aluminum tolerance on genotypes of signal grass

Bitencourt

Chiari²,

Laura³

et al. 2011

R. Bras. Zootec.

View full text Add to dashboard Cite

show abstract

“…Além disso, essa gramínea teve maior produção de parte aérea e de raízes em soluções com alta concentração de alumínio, em comparação aos cultivares Mombaça e Tanzânia (Almeida et al, 2000b), caracterís-ticas que podem ser confirmadas pelo desenvolvimento de seu sistema radicular mais adaptado às condições adversas do solo, como compactação, fertilidade e acidez.…”

Section: Resultsunclassified

Avaliação dos capins mombaça e massai sob pastejo

Euclides¹,

Macedo²,

Zimmer³

et al. 2008

R. Bras. Zootec.

View full text Add to dashboard Cite

RESUMO -Visando à liberação para uso comercial, realizou-se avaliação do capim-massai (Panicum maximum) quanto à adaptação e produtividade. No plantio foram utilizados 2,7 t/ha de calcário dolomítico, 500 kg/ha da fórmula 0-20-15 e 50 kg/ha de FTE BR-12. Como adubação de cobertura, efetuaram-se aplicações da fórmula 0-20-20 (200 kg/ha) The Panicum maximum cultivars tested were Mombaça and Massai. The experimental design was a randomized complete block with two treatments and two replicates. The paddocks (1.5 ha) were divided in six, and submitted to a rotational stocking with 7 days of grazing and 35 days of rest. Four steers (testers) were kept in each paddock for a whole year and additional steers were allocated and removed from each paddock to assure post-grazing residues higher than 2 t/ha of dry matter. All pastures were sampled, before and after grazing, to estimate forage availability, percentages of the morphological components and nutritive value. The animals were weighed each 42 days. Steers grazing Mombaça pasture performed better than those grazing Massai pasture, averaging 437 and 300 g/steer/day, respectively. However, the Massai pasture sustained higher stocking rate than the Mombaça pasture, with stocking rates of 2.15 and 1.86 AU/ha, respectively. This higher carrying capacity was not enough to compensate for the lower liveweight gain in the Massai pasture, resulting in lower productivity when compared to the Mombaça pasture, with averages of 626 and 691 kg/ha/year, respectively. The satisfactory performance presented by cv Massai, associated with other important characteristics of adaptability, attest the value of this cultivar as an alternative pasture for different beef cattle systems as well as a contribution to their sustainability.Key Words: animal performance, cultivar selection, forage accumulation, forage yield, stocking rate, nutritive value . IntroduçãoA manutenção de níveis de produção forrageira satisfatórios, compatíveis com o clima e as condições físico-químicas do solo de forma a manter o sistema sustentável ao longo do tempo constitui-se um dos grandes problemas da pecuária de corte. A busca da solução deste problema envolve não só a identificação de materiais forrageiros

show abstract

“…7; the solution affected the shoot dry matter production of U. ruziziensis, but not of U. brizantha and U. dictyoneura (Haussler et al, 2006). On the other hand, there were very strong differences in root growth rates between 30 Panicum maximum genotypes (Almeida et al, 2000). Nolla et al (2007) studied effects of aluminium on soybeans, and found declines in both shoot and root dry matter when the aluminium concentration increased.…”

Section: Discussionmentioning

confidence: 99%

Early Seedling Growth as a Tool to Assess the Tolerance of Urochloa brizantha Cultivars to Free Aluminium

Yamamoto¹,

Gasparim²,

Neto³

et al. 2018

JAS

View full text Add to dashboard Cite

In this study we aimed to evaluate changes in germination, early seedling growth, and some biochemical parameters in Urochloa brizantha cultivars (Basilisk, Marandu, MG4, MG5, BRS Piatã, and Xaraés) subjected to five levels of free aluminium toxicity (0, 1, 2, 4, and 8 mmol c dm³ Al³ + ), and to verify the selection efficiency of aluminium tolerant cultivars. In the germination assay, lots were submitted to germination under simulated stress conditions in the laboratory, to quantify root protrusion, number of normal seedlings, shoot and root length, and dry mass. In the early seedling growth assay, evaluations were done on the seventh day after subjecting seedlings to aluminium stress conditions. Relative growth rate of length, and dry mass of shoots and roots, superoxide dismutase activity (SOD), and concentrations of proline, total antioxidants (TEAC), and malondialdehyde (MDA) were evaluated. During the seedling study period, up to 14 days after sowing, the most tolerant cultivar maintained root growth in aluminium stress conditions, while the most susceptible cultivar reduced root growth, and developed proportionally more shoots, as shoot growth depends on seed reserves. The germination assay indicated interference of the initial seed quality with increasing Al 3+ concentrations. The results indicate that the early seedling growth assay, which excluded germination effects, and used the measurement of root attributes, is appropriate for the discrimination of Al 3+ tolerant genotypes. The Marandu cultivar was the most similar to the Al 3+ tolerance standard Basilisk cultivar.

show abstract

Avaliação de Panicum maximum jacq. para tolerância ao alumínio em solução nutritiva

Cited by 12 publications

References 12 publications

Aluminum tolerance on genotypes of signal grass

Aluminum tolerance on genotypes of signal grass

Avaliação dos capins mombaça e massai sob pastejo

Early Seedling Growth as a Tool to Assess the Tolerance of Urochloa brizantha Cultivars to Free Aluminium

Contact Info

Product

Resources

About