Keywords Pinus thunbergii;Bursaphelenchus xylophilus;programmed cell death;TUNEL detection;ultrastructural changes;calcium;ployamines;water potential;root activity;

• 黑松;松材线虫;细胞程序性死亡;TUNEL检测;超微结构;钙离子;多胺;水势;根系活力;