12 research outputs found

    TolerĂąncia ao alumĂ­nio em cultivares de aveia branca sob cultivo hidropĂŽnico Tolerance to the aluminum in oat cultivars under hydroponic culture

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    O emprego do cultivo hidropĂŽnico para avaliar a tolerĂąncia Ă  toxicidade pelo alumĂ­nio em genĂłtipos de aveia pode ser feito por meio da medida da retomada do crescimento de raiz. Avaliaram-se 12 cultivares de aveia branca indicadas para o cultivo no Sul do Brasil com o intuito de caracterizar a tolerĂąncia ao alumĂ­nio, de maneira a ser estrategicamente recomendadas e/ou incluĂ­das em blocos de cruzamento na obtenção de constituiçÔes genĂ©ticas de elevado potencial produtivo e tolerante ao Ă­on metĂĄlico. Foram utilizadas doses de 10, 15 e 20 mg L-1 de alumĂ­nio na solução hidropĂŽnica e o delineamento experimental adotado foi o completamente casualizado, com trĂȘs repetiçÔes, seguindo o esquema fatorial (12 x 3). As doses empregadas sĂŁo altamente eficientes na identificação de genĂłtipos de aveia tolerantes e sensĂ­veis ao alumĂ­nio tĂłxico. As cultivares UPF 16, URS 21, UFRGS 14, UPF 19 e UFRGS 17 expressam tolerĂąncia.<br>The use of hidroponic culture to evaluate tolerance to aluminum toxicity in oat genotypes can be performed by measuring root regrowth, allowing phenotypically to discriminate tolerant genetic constitutions sensitivity. Twelve white oat cultivars indicated for cultivation in Southern Brazil were evaluated aiming at to characterize their aluminum tolerance, in order to use them as parents in crosses or to recommend them for in cultivation regions. Aluminum concentration of 10, 15 and 20 mg L-1 were used in the hydroponic solution arranged in complete randomized blocks with three replications in 12 x 3 factorial designs. Concentrations of 10, 15 and 20 mg L-1 were highly efficient for the identification of tolerant and sensitive oat genotypes. Cultivars UPF 16, URS 21, UFRGS 14, UPF 19 and UFRGS 17 showed aluminum

    Aluminium tolerance in barley (Hordeum vulgare L.): physiological mechanisms, genetics and screening methods

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    Aluminium (Al) toxicity is one of the major limiting factors for barley production on acid soils. It inhibits root cell division and elongation, thus reducing water and nutrient uptake, consequently resulting in poor plant growth and yield. Plants tolerate Al either through external resistance mechanisms, by which Al is excluded from plant tissues or internal tolerance mechanisms, conferring the ability of plants to tolerate Al ion in the plant symplasm where Al that has permeated the plasmalemma is sequestered or converted into an innocuous form. Barley is considered to be most sensitive to Al toxicity among cereal species. Al tolerance in barley has been assessed by several methods, such as nutrient solution culture, soil bioassay and field screening. Genetic and molecular mapping research has shown that Al tolerance in barley is controlled by a single locus which is located on chromosome 4H. Molecular markers linked with Al tolerance loci have been identified and validated in a range of diverse populations. This paper reviews the (1) screening methods for evaluating Al tolerance, (2) genetics and (3) mechanisms underlying Al tolerance in barley

    Globalization of tephrochronology: new views from Australasia

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