P-081 - Light intensity in regulating the control efficacy of Bacillus amyloliquefaciens PMB05 to bacterial wilt of tomato

Bacillus amyloliquefaciens PMB05 is a biocontrol agent to control tomato bacterial wilt through plant immunity intensification. Light is an essential energy source for plants supporting its physiological functions and disease resistance. Its regulation is closely related to light intensity. However, the effect of light intensity on the ability of B. amyloliquefaciens PMB05 to regulate disease resistance remains unclear. In this study, we demonstrated that PAMP-triggered immune responses was positively-correlated on the light intensity; as the light intensity increased, the reactive oxygen species (ROS) generation also increased. And, the PAMP-mediated hypersensitive response was intensified under medium (100PPFD) and high (200PPFD) light intensity. In the control efficacy assay, result show that the occurrence of bacterial wilt disease was reduced by increasing the light intensity in Arabidopsis. More importantly, B. amyloliquefaciens PMB05 exhibited stronger control efficacy to bacterial wilt. This effect of light intensity was similar to the control of B. amyloliquefaciens PMB05 in tomato. Therefore, optimizing light intensity according to crop-specific requirements is crucial to maximizing the biocontrol potential of B. amyloliquefaciens PMB05.
Keyword: beneficial bacteria, plant health, plant immunity