Table 1.

Contents of CKs in rice seminal roots under different N treatments. Germinated rice seeds were cultured in solutions containing different concentrations of N for four days, and then the contents of the CKs, including Z, DZ, and iP in rice seminal roots, were measured. Data are presented as means ± SD of three independent biological replicates. Significant differences (p < 0.05) in the content of the same type of CK between different treatments are indicated by different letters (a, b, c, d). CKs, cytokinins; DZ, dihydrozeatin; FW, fresh weight; iP, isopentenyladenine; N, nitrogen; 1 N, 1 mM N; 1/4 N, 1/4 mM N; 1/16 N, 1/16 mM N; 0 N, 0 mM N. Z, zeatin.

Treatments	Z (pmol g−1 FW)	DZ (pmol·g−1 FW)	iP (pmol·g−1 FW)
1 N	198.4 ± 11.1 a	1.12 ± 0.06 a	6.36 ± 0.16 a
1/4 N	102.3 ± 2.6 b	1.09 ± 0.07 a	6.32 ± 0.21 a
1/16 N	71.3 ± 2.8 c	1.13 ± 0.06 a	6.40 ± 0.17 a
0 N	68.2 ± 0.8 d	1.09 ± 0.04 a	6.30 ± 0.33 a