Observations were performed with confocal laser scanning microscopy (CLSM) and electron microscopy , respectively , at 8 d and 12 d /10d after in.

• 用标记菌株接种限菌培养条件下生长的玉米(农大3318)幼苗,在接种8天、12天后,取其根部,用激光共聚焦扫描显微镜进行观测。