Table 5: Effects of salicylic acid on photosynthetic pigments of cowpea (ART 98-12) exposed to arsenic stress.

Arsenic (mg/L)

Bioregulators (mg/L)

Chl a(mg/g/fw)

Chl b(mg/g/fw)

Car (mg/g/fw)

0

0

7.84 ± 0.04c

5.05 ± 0.03b

2.04 ± 0.04b

250

0

0.43 ± 0.02l

0.20 ± 0.01m

0.08 ± 0.00k

500

0

0.20 ± 0.01m

0.09 ± 0.00n

0.02 ± 0.00l

0

SA 150

9.31 ± 0.02a

5.41 ± 0.02a

2.19 ± 0.00a

250

SA 150

6.77 ± 0.01e

1.93 ± 0.03f

0.82 ± 0.03g

500

SA 150

4.77 ± 0.02h

1.68 ± 0.01h

0.94 ± 0.03f

0

SA 75

7.99 ± 0.01bc

4.41 ± 0.05c

1.27 ± 0.04d

250

SA 75

5.19 ± 0.01g

1.85 ± 0.02g

0.20 ± 0.01j

500

SA75

3.20 ± 0.00j

1.31 ± 0.01i

0.93 ± 0.03f

Chl a: Chlorophyll a

Chl b: Chloro[hyll b

Car: Carotenoid

Means with different letter are significantly different from each other