Rhizobacterial promotion of eucalypt rooting and growth

Brazilian Journal of Microbiology

Débora A. Teixeira²  Acelino Couto Alfenas²  Reginaldo Gonçalves Mafia²  Eraclides M. Ferreira²  Leandro De Siqueira²  Luiz A. Maffia²  Ann H. Mounteer¹ 

[1] ,Federal University of Viçosa Department of Phytopathology Viçosa Minas Gerais ,Brazil

关键词: Eucalyptus;    cloning;    mini-cutting;    cutting;    rhizobacteria;    Eucalyptus;    clonagem;    miniestaquia;    estaquia;    rizobactéria;   

DOI  :  10.1590/S1517-83822007000100025

来源: SciELO

【 摘 要 】

A total of 107 rhizobacterial isolates, obtained from the rhizosphere of eucalypt clones were tested as rooting inducers of cuttings and mini-cuttings planted in substrate composed of carbonized rice husk and vermiculite (1:1). Cuttings and mini-cuttings were planted in conical plastic tubes containing treated and untreated (control) substrate and kept under intermittent mist irrigation at 26-28ºC. After 35 days, rooting percentage and dry root matter of cuttings were evaluated. Ten isolates capable of providing gains of up to 110% in root formation and up to 250% in root biomass over non-inoculated control cuttings were selected. Gains in rooting varied according to clone and isolate tested. The greatest gains were obtained for the mini-cuttings exhibiting the lowest rooting efficiency. Among the ten isolates tested, only 3918 (code R98) and MF4 (code R87), produced 3-indole-acetic acid in vitro, at concentrations of 0.7 and 0.67 µg ml-1, respectively. Significant increases in rooting and root dry matter of cuttings grown on rhizobacteria-inoculated substrate were found when compared to untreated or indole-butyric acid (IBA) treated mini-cuttings.

【 授权许可】

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