Table 1.

The PCD ratio of peanut root tip cells under 100 μM AlCl ₃

Treatment time (h)	99-1507	ZH2
0	0%	0%
4	5 ± 2.6% *	9 ± 1.2%
8	17 ± 1.5% **	21 ± 0.8%
12	23 ± 1.8% **	30 ± 1.4%

The cell PCD ratio was calculated as a percentage of apoptosis cells to total cells in one 400 × microscopic field. More than 50 random fields were observed and calculated.

* and ** means significance at P < 0.05 and P < 0.01( Student’s t test) compared with ZH2, respectively.