. 2017 May 19;12(5):e0177963. doi: 10.1371/journal.pone.0177963

Table 2. The Cd and microelements content (mg/kg DW) in the above-ground biomass of plants.

Variable	Treatment
	N. praecox	N. praecox-Cd	N. caerulescens	N. caerulescens-Cd
Cd	26.4^a ^B ± 0.7	7045^b ^B ± 66	2.4^a ^A ± 0.05	134^b ^A ± 6
Zn	543^a ^A ± 46	539^a ^B ± 38	495^b ^A ± 29	201^a ^A ± 16
Cu	5.4^a ^A ± 0.5	6.0^b ^A ± 0.3	6.8^a ^B ± 0.7	6.2^a ^A ± 0.6
Mn	70.1^a ^A ± 11.0	76.2^a ^A ± 9.2	110.8^a ^B ± 8.5	108.4^a ^B ± 7.8
Ni	71.6^b ^A ± 6.7	42.8^a ^B ± 3.2	104.5^b ^B ± 6.7	9.2^a ^A ± 0.9

Treatment abbreviations: N. praecox, Noccaea praecox control plants without cadmium; N. praecox-Cd, Noccaea praecox plants with Cd solution in soil with a concentration of 90 mg Cd/kg of soil; N. caerulescens, Noccaea caerulescens control plants without cadmium; N. caerulescens-Cd, Noccaea caerulescens plants with Cd solution in soil with a concentration of 90 mg Cd/kg of soil.

The values represent the means of data obtained in the experiment (n = 5). Different letters indicate values that are significantly different (p < 0.05):

A, B comparison between the two species with the same treatment (growing with or without Cd solution applied to the tested soil)

a, b comparison between treatments in each species.