Rhizobacteria induces resistance against Fusarium wilt of tomato by increasing the activity of defense enzymes

Bragantia

Hélvio Gledson Maciel Ferraz¹  Renata Sousa Resende¹  Patrícia Ricardino Silveira¹  Camila Cristina Lage Andrade¹  Elisângela Aparecida Milagres¹  José Rogério Oliveira¹  Fabrício De Ávila Rodrigues¹ 

[1] ,Universidade Federal de Viçosa (UFV) Departamento de Fitopatologia Viçosa MG ,Brasil

关键词: Fusarium oxysporum f.sp. lycopersici;    Solanum lycopersicum;    biological control;    host defense mechanisms;    induced resistance;    vascular pathogen;    Fusarium oxysporum f.sp. lycopersici;    Solanum lycopersicum;    controle biológico;    mecanismos de defesa do hospedeiro;    resistência induzida;    patógeno vascular;   

DOI  :  10.1590/1678-4499.0124

来源: SciELO

【 摘 要 】

Fusarium wilt, caused by Fusarium oxysporum f.sp. lycopersici (Fol), is one of the most important diseases that affect tomato yield worldwide. This study investigated the potential of three antagonists, Streptomyces setonii (UFV 618), Bacillus cereus (UFV 592) and Serratia marcescens (UFV 252), and as positive control the hormone jasmonic acid (JA), to reduce Fusarium wilt symptoms and to potentiate the defense enzymes in the stem tissues of tomato plants infected by Fol. The seeds were microbiolized with each antagonist, and the soil was also drenched with them. The plants were sprayed with JA 48 h before Fol inoculation. The area under the Fusarium wilt index progress curve was reduced by 54, 48, 47 and 45% for the UFV 618, JA, UFV 592 and UFV 252 treatments, respectively. The three antagonists, and even the JA spray, efficiently reduced the Fusarium wilt symptoms on the tomato plant stems, which can be explained by the lower malondialdehyde concentration (an indication of oxidative damage to lipids in the plasma membranes) and the greater activities of peroxidases, polyphenoloxidases, glucanases, chitinases, phenylalanine ammonia-lyases and lipoxygenases, which are commonly involved in host resistance against fungal diseases. These results present a novel alternative that can be used in the integrated management of Fusarium wilt on tomatoes.

【 授权许可】

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