Table 6: Effects of salicylic acid on photosynthetic pigments of cowpea (ITOK-568-18) 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

8.31 ± 0.01d

5.38 ± 0.01b

1.96 ± 0.02c

250

0

1.94 ± 0.04l

1.05 ± 0.05k

0.42 ± 0.02g

500

0

0.99 ± 0.01m

0.73 ± 0.03 m

0.18 ± 0.00i

         

0

SA 150

9.97 ± 0.06n

5.62 ± 0.15a

2.05 ± 0.03ab

250

SA 150

8.92 ± 0.01b

3.63 ± 0.03f

1.74 ± 0.03ab

500

SA 150

6.89 ± 0.01f

1.93 ± 0.44i

0.73 ± 0.03d

0

SA 75

8.55 ± 0.09c

5.20 ± 0.00c

1.73 ± 0.03d

250

SA 75

7.86 ± 0.01e

4.09 ± 0.06e

2.01 ± 0.00bc

500

SA75

7.00 ± 0.00g

2.42 ± 0.02h

0.93 ± 0.03e

Means with different letter are significantly different from each other

Chl a: Chlorophyll a

Chl b: Chloro[hyll b

Car: Carotenoid