Table 4: Effects of salicylic acid on photosynthetic pigments of cowpea(Ife brown) exposed to arsenic stress.

Arsenic (mg/L)

Bioregulator

(mg/L)

Chl a(mg/g/fw)

Chl b(mg/g/fw)

Car(mg/g/fw)

0

0

11.02 ± 0.02d

6.76 ± 0.06cd

2.00 ± 0.02e

250

0

4.12 ± 0.01l

1.27 ± 0.02gh

0.32 ± 0.01m

500

0

3.03 ± 0.04m

0.98 ± 0.01h

0.20 ± 0.00n

         

0

SA 150

12.53 ± 0.02b

7.96 ± 0.03ab

3.05 ± 0.04b

250

SA 150

11.09 ± 0.02d

7.22 ± 0.01bc

2.31 ± 0.00c

500

SA 150

9.07 ± 0.03g

5.74 ± 1.44de

1.03 ± 0.00h

0

SA 75

11.20 ± 0.01c

7.11 ± 0.01bc

2.99 ± 0.01b

         

250

SA 75

10.00 ± 0.05e

6.68 ± 0.02cd

2.15 ± 0.02d

500

SA 75

7.21 ± 0.01i

3.89 ± 0.01f

0.52 ± 0.01k

Chl a: Chlorophyll a

Chl b: Chloro[hyll b

Car: Carotenoid

Means with different letter are significantly different from each other