TABLE 1.

The AM colonization of M. truncatula under Pb stress and melatonin application.

Treatment	Colonization (%)
AM0	83.70 ± 2.87b
AM0M	91.66 ± 2.01c
AM800	74.33 ± 4.61a
AM800M	82.46 ± 3.87b
Significance of melatonin	**
Significance of Pb	***

The data are the means ± standard deviation (n = 4). The abbreviation is consistent with the above. **P < 0.01, ***P < 0.001.