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Bragantia

On-line version ISSN 1678-4499

Abstract

PEIXOTO, Paulo Henrique Pereira; PIMENTA, Daniel Sales  and  CAMBRAIA, José. Changes in morfology and phenolics accumulation in sorghum (Sorghum bicolor (L.) Moench) plants under aluminum stress. Bragantia [online]. 2007, vol.66, n.1, pp. 17-25. ISSN 1678-4499.  http://dx.doi.org/10.1590/S0006-87052007000100003.

The Al+3 effects on the morphology and on the phenolics accumulation were evaluated in two sorghum cultivars exhibiting differential tolerance to Al+3. The plants were kept in nutrient solution, for ten days, in the presence (185 mM) or Al+3 absence. The root apexes were colored with ferric hematoxylin, and because the intensity of color development is very similar among evaluated cultivars, the use of this method as a selection parameter for Al+3-tolerance is not indicated. Analyses of superficial and internal morphology from tissues treated with Al+3 also expressed very similar alterations among the two cultivars, not allowing its use for selection between sensitive and Al+3-tolerant genotype. The higher lignin accumulation and, mainly, the lower phenolics production in roots of the BR006R cultivar in Al+3's presence, demonstrated the existence of differential tolerance among cultivars.

Keywords : aluminum; morphology; phenolics; sorghum; Sorghum bicolor.

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