Abstract
The objective of this work was to test a simple method for root hair evaluation of 21 common bean (Phaseolus vulgaris) genotypes, most of them used in breeding programs in Brazil. Hairs of basal and primary roots of 5-day old seedlings, produced on germination paper with no phosphorus addition, were visually evaluated by a rating scale after staining with 0.05% trypan blue. The method reveals variability among the genotypes, and the standard error of the mean is relatively low.
Highlights
Resumo – O objetivo deste trabalho foi testar um método simples para a avaliação de pêlos radicais de 21 genótipos de feijão (Phaseolus vulgaris), a maioria deles usada em programas de melhoramento no Brasil
Root hair production is stimulated by the deficiency of several nutrients, including iron, zinc, manganese, and phosphorus, but, at least in Arabidopsis, phosphorus has a greater effect than other nutrients on root hair density and length (Bates & Lynch, 1996; Ma et al, 2001)
Phosphorus uptake by root is limited by localized phosphorus depletion around the root
Summary
Resumo – O objetivo deste trabalho foi testar um método simples para a avaliação de pêlos radicais de 21 genótipos de feijão (Phaseolus vulgaris), a maioria deles usada em programas de melhoramento no Brasil. Common bean exhibits substantial genotypic variation in root hair length and density, ranging from abundant long hairs to virtually hairless (Yan & Lynch, 1998). Common bean genotypes with longer and denser root hairs had more total biomass under low phosphorus availability, compared to those with shorter and less dense root hairs in the same level of phosphorus availability.
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