Data/hora: 09/06/2024 10:27:21

Provedor de dados: | Ciência Rural
País: | Brazil
Título: | Relationship between chemical properties of the soil and the occurrence of Bacillus thuringiensis
Autores: | Polanczyk,Ricardo Antonio; Zanúncio,José Cola; Alves,Sérgio Batista.
Data: | 2009-02-01
Ano: | 2009
Palavras-chave: | Bt; Chemical elements; Entomopathogen; Soil; Biological control.
Resumo: | The soil and other substrates such as mushroom compounds are the main sources of new Bacillus thuringiensis (Bt) isolates for Integrated Pest Management programs. This study describes the relationship between chemical properties of the soil (pH, OM, P3+, K1+, Ca2+, Mg2+, H1++Al3+, B3+, Cu2+, Fe2+, Mn2+ and Zn2+) and the occurrence of Bt in Brazil. A total of 1,197 bacterial colonies were obtained, being 512 of them identified as Bt. The Bt index (iBt), which is the relation between Bt colonies and bacterial counts ranged from 0.18 to 0.86. The iBt may be expressed with the formula: iBt= -0.4 + 0.6Ca2+ + 0.07Cu2+ + 0.009Fe2+ - 0.53Mg2+ -0.12Mn2+ + 1.26Zn2+. A cluster of samples with fewer colonies and a high negative correlation (antagonism) between Mn2+ and Ca2+; Mg2+ and Ca2+; Mg2+ and Zn2+; Mn2+ and Zn2+ and a high positive correlation (synergism) between Mn2+ and Mg2+; Zn2+ and Ca2+ was observed. The relationship between these elements and their effect on the Bt presence are discussed.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000100001
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/S0103-84782009000100001
Formato: | text/html
Fonte: | Ciência Rural  v.39 n.1 2009
Fonte: | info:eu-repo/semantics/openAccess