Symbiotic weaponry: the role of bacterial mediators in aphid-plant defense conflicts.

Severe aphid infestations drive unsustainable pesticide use, necessitating deeper understanding of aphid-plant-microbe interactions. To control those pests like aphids, which may cause severe infestations on vegetables and field crops, we need to understand how they maintain the relationship with the host plant. So, these studies compiled interesting characteristics of microbial involvements in plant-aphid interaction and the specific roles of bacterial communities, and how those impact the actual interactions between aphids and their plant hosts. This includes aphid-sympathetic (obligate and facultative) and plant-associated bacteria (that may either be in the rhizosphere or phyllosphere or endophytic) that can change or influence both plant defense response, as well as aphid physiology and ecology in general. We outlined some functional traits of bacteria, focusing on enzymatic and metabolic activities that reveal their ecological and protective roles. The review emphasizes key microbial traits such as catalase, protease, lipase, siderophore production, and phosphate solubilization, highlighting their functions within the plant-aphid-microbe triangle. studies aim to classify and describe two broad bacterial groups associated with aphids and host plants, evaluate their functional roles in mediating host resistance or enhancing aphid virulence, and the interaction causes. Further case studies and recent findings illustrating these tripartite interactions, and discuss how microbial traits can be leveraged for sustainable pest management (SPM) and crop improvement.