Relationship between chemical properties of the soil and the occurrence of Bacillus thuringiensis

Ciência Rural

Ricardo Antonio Polanczyk²  José Cola Zanúncio¹  Sérgio Batista Alves¹ 

[1] ,Universidade Federal do Espírito Santo Centro de Ciências Agrárias Núcleo de Desenvolvimento Científico e Tecnológico em Manejo Fitossanitário de Pragas e DoençasAlegre ES ,Brasil

关键词: Bt;    chemical elements;    entomopathogen;    soil;    biological control;    Bt;    elementos químicos;    entomopatógeno;    solo;    controle biológico;   

DOI  :  10.1590/S0103-84782009000100001

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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