Data/hora: 18/06/2024 07:12:45

Provedor de dados: | Revista Brasileira de Ciência do 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; Stomata.
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
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832007000300007
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
Fonte: | info:eu-repo/semantics/openAccess