[Objective] The healthy and huanglongbing-affected Catharanthus roseus under manual-grafting condition were used as materials for research. The endophytic bacterial community structure and function of different parts of healthy and huanglongbing-affected Catharanthus roseus were analysisied, which provided a basis theoretical foundation for correlative study between citrus huanglongbing and Catharanthus roseus endophytic bacterial. [Methods] The endophytic bacterial communities were analysised based on the ...