BOTANY

Detailed explanation-1: -Although the host may affect symptom expression, there are four basic types of symptoms associated with bacterial diseases of plants. These symptom groupings are necrosis, vascular wilt, soft rot, and overgrowths.

Detailed explanation-2: -Symptoms are changes in plant growth or appearance in response to biotic or abiotic factors. Examples of symptoms include dieback, flagging, wilting, and chlorosis. The same symptom, such as dieback, can be produced by multiple causes.

Detailed explanation-3: -Plants respond to pathogen infection by enhancing the antifungal gene expression of root-associated bacteria. Mol Plant Microbe Interact.