Combined Stresses in Plants: Physiological, Molecular, and Biochemical Aspects

4 Combination of Elevated CO 2 Levels and Soil Contaminants’ Stress ... 81

concentrationCu

)-1 rioe shoots (mg kg

35 30 25 20 15 10 5 0

FA

CE

Ambient

concentrationCu

)-1 rioe shoots (mg kg

FA

CE

Ambient

18 15 12 9 6 3 0

concentrationCu

)-1 rioe shoots (mg kg

FA

CE

Ambien

t

12 10 8 6 4 2 0

concentrationCu

)-1 rioe shoots (mg kg

FA

CE

Ambient

10 8 6 4 2 0

FA

CE

Ambien

t

concentrationCu

)-1 rioe shoots (mg kg

10 8 6 4 2 0

Cu

added to soil (mg kg

-1

)

FA

CE

Ambien

t

concentrationCu

)-1 rioe shoots (mg kg

10 8 6 4 2 0

05

0

400

a de

f

bc

Fig. 4.5

Copper concentrations in tissues of rice plants grown in soil with

0, 50, or 400

mg

kg

−1

Cu, under either ambient CO

levels or elevated CO 2

levels 2

( FACE

).

a Rice shoots at the mid-tillering growth stage of the first rice sowing,

b rice shoots at the panicle-initiation growth stage of the first rice sowing,

c^

rice shoots at grain maturity of the first sowing,

d rice seeds at grain maturity of the first season,

e rice shoots at grain maturity of the second season, and

f rice

seeds at grain maturity of the second season. Values represent means

±^

SD. An asterisk indicates a significant difference between

FACE and ambient conditions

( p

<

0.05).

FACE

free-air CO

enrichment 2