Ciência e Agrotecnologia
Print version ISSN 1413-7054
ISHIDA, Alessandra Keiko Nakasone et al. Rhizobacteria to control cotton bacterial blight. Ciênc. agrotec. [online]. 2008, vol.32, n.1, pp. 149-156. ISSN 1413-7054. http://dx.doi.org/10.1590/S1413-70542008000100022.
The potential of rhizobacteria was evaluated for resistance induction against Xanthomonas axonopodis pv. malvacearum. After isolation, the rhizobacteria were screened for the reduction of angular leaf spot severity under greenhouse conditions. They were spatially separated from the challenging pathogen. The best isolates were tested for the capacity to reduce ramulose and Verticillium wilt severity and directly inhibit pathogens in vitro. From a total of 123 rhizobacterial isolates, five were selected, L2-1 (Bacillus cereus), MT5-6 (Bacillus cereus), L2-2 (Achromobacter xylosoxidans), MT5-5 (Bacillus cereus) and MT5-11 (Brevibacterium sp.), which showed angular leaf spot control above 40% as compared to the control. The tested isolates neither reduced the severity of ramulose and verticillium wilt compared to the control nor showed in vitro direct inhibition to X. axonopodis pv. malvacearum and Colletotrichum gossypii var. cephalosporioides. For V. dahliae, only isolate L2-1 showed direct inhibition.
Keywords : Gossypium hirsutum; Xanthomonas axonopodis pv. malvacearum; Colletotrichum gossypii var. cephalosporioides; Verticillium dahliae; induced resistance.