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Provedor de dados:  Rev. Bras. Ciênc. Solo
País:  Brazil
Título:  Coffee leaf and stem anatomy under boron deficiency
Autores:  Rosolem,Ciro Antonio
Leite,Vagner Maximino
Data:  2007-06-01
Ano:  2007
Palavras-chave:  Boron deficiency
Ca/B ratio
Coffee nutrition
Resumo:  Boron deficiency in coffee is widely spread in Brazilian plantations, but responses to B fertilizer have been erratic, depending on the year, form and time of application and B source. A better understanding of the effects of B on plant physiology and anatomy is important to establish a rational fertilization program since B translocation within the plant may be affected by plant anatomy. In this experiment, coffee plantlets of two varieties were grown in nutrient solutions with B levels of 0.0 (deficient), 5.0 µM (adequate) and 25.0 µM (high). At the first symptoms of deficiency, leaves were evaluated, the cell walls separated and assessed for B and Ca concentrations. Scanning electron micrographs were taken of cuts of young leaves and branch tips. The response of both coffee varieties to B was similar and toxicity symptoms were not observed. Boron concentrations in the cell walls increased with B solution while Ca concentrations were unaffected. The Ca/B ratio decreased with the increase of B in the nutrient solution. In deficiency of B, vascular tissues were disorganized and xylem walls thinner. B-deficient leaves had fewer and deformed stomata.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Sociedade Brasileira de Ciência do Solo
Relação:  10.1590/S0100-06832007000300007
Formato:  text/html
Fonte:  Revista Brasileira de Ciência do Solo v.31 n.3 2007
Direitos:  info:eu-repo/semantics/openAccess

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