Observation on root tip microstructure showed that TCB and NAP increased root thickness, which was mainly due to the increase in cell volume, not due to increase in cell number.

• 根系伸长抑制可作为判断有机污染物植物伤害程度的形态学敏感指标,而伤流量可作为诊断成苗期水稻伤害程度的生理指标。