Table 3.

Correlation coefficients among 2-AP, GABA, total nitrogen, and proline content in grains

Index	2-AP content	Grain GABA content	Proline content	Total nitrogen content
Yuxiangyouzhan
2-AP content	1	0.8326**	0.5460	−0.5557
GABA content	0.8326**	1	0.6926	−0.3402
Proline content	0.5460	0.6926	1	−0.2272
Total nitrogen content	−0.5557	−0.3402	−0.2272	1
Nongxiang 18
2-AP content	1	0.5442	0.5356	−0.1758
GABA content	0.5442	1	0.3565	0.3836
Proline content	0.5356	0.3565	1	0.3267
Total nitrogen content	−0.1758	0.3836	0.3267	1

Significant correlations at **p < 0.01.