TABLE 2.

Effect of PEG on germination index of Apocynum venetum and Apocynum pictum seeds stored for 0, 1, or 2 years.

PEG (%)	Apocynum venetum			Apocynum pictum
	0	1	2	0	1	2
0	73.5 ± 3.1Aa	73.4 ± 1.4Aa	59.9 ± 1.3Ba	72.1 ± 0.8Aa	66.9 ± 0.8Ba	53.5 ± 1.4Ca
5	76.8 ± 2.1Aa	70.0 ± 2.2Ba	49.1 ± 0.9Cb	68.7 ± 0.9Aa	63.4 ± 4.5Aa	43.7 ± 0.8Bb
10	73.4 ± 2.0Aa	65.5 ± 2.4Bab	40.8 ± 0.9Cc	67.4 ± 2.5Aa	59.1 ± 3.1Aab	27.4 ± 1.6Bc
15	69.3 ± 2.1Aa	59.8 ± 6.9Aab	30.9 ± 2.2Bd	63.7 ± 1.5Aa	59.7 ± 4.6Aab	19.5 ± 0.9Bd
20	66.2 ± 6.7Aab	54.2 ± 2.3Ab	19.2 ± 1.7Be	63.9 ± 2.9Aa	54.1 ± 3.9Ab	4.7 ± 4.2Be
25	62.3 ± 3.2Ab	40.2 ± 6.3Bc	4.5 ± 1.9Cf	46.7 ± 4.3Ab	33.0 ± 5.0Bc	–
30	28.2 ± 3.0Ac	28.2 ± 7.5Ad	–	23.9 ± 2.1c	–	–
40	–	–	–	–	–	–

Different upper-case letters indicate significant difference between 0, 1, and 2 years at the same concentrations; different lower-case letters indicate significant difference among different concentrations of PEG at P < 0.05.