Open AccessLimited impact of abiotic stress on surfactin production in planta and on disease resistance induced by B acillus amyloliquefaciens S 499 in tomato and bean
Author(s) -
Pertot Ilaria,
Puopolo Gerardo,
Hosni Taha,
Pedrotti Lorenzo,
Jourdan Emmanuel,
Ongena Marc
Publication year - 2013
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1111/1574-6941.12177
Subject(s) - surfactin , bacillus amyloliquefaciens , biology , rhizobacteria , rhizosphere , phytotron , biological pest control , abiotic stress , abiotic component , colonization , biofilm , microorganism , horticulture , agronomy , botany , bacillus subtilis , microbiology and biotechnology , bacteria , food science , ecology , fermentation , biochemistry , genetics , gene
Understanding how temperature and water stress affect protocooperation between plants and beneficial rhizobacteria may enhance the efficacy of biocontrol agents in reducing plant diseases. However, little is known about the impact of these factors on biocontrol mechanisms and effectiveness, especially when provided by beneficial B acillus spp. This work aimed to evaluate the influence of low/high temperature combined with a normal and reduced water regime on the interaction between B acillus amyloliquefaciens strain S 499 and plants, resulting in the induction of systemic resistance ( ISR ). A reduction in ISR level was observed when plants were subjected to stress before bacterization; however, root treatment with S 499 prior to stress exposure attenuated this negative effect. Colonization of S 499 during exposure to temperature/water stress allowed the three crops to conserve their overall ability to mount defense lines to a similar degree at all the temperatures tested. Further investigation revealed that relative production of surfactin by S 499 was clearly enhanced at low temperature, making it possible to counter‐balance the negative effect on traits associated with rhizosphere fitness (colonization, motility, and biofilm formation) observed in vitro in cold conditions. This work thus represents a first step in deciphering the effect of high/low temperatures and/or drought on key plant–microorganism interactions culminating in ISR .