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Table 2 Effect of different concentrations of boron on photosynthetic and biochemical attributes of M. arvensis and C. flexuosus

From: Effects of boron toxicity on growth, oxidative damage, antioxidant enzymes and essential oil fingerprinting in Mentha arvensis and Cymbopogon flexuosus

Plants/treatments

Total chlorophyll content (mg g−1 FW)

Total carotenoid content (mg g−1 FW)

Chlorophyll fluorescence (FV/FM)

Nitrate reductase activity (NO2 g−1 FWh−1)

Carbonic anhydrase activity (CO2 kg−1 FWs−1)

M. arvensis

 Control

1.44 ± 0.08a

0.554 ± 0.008a

0.789 ± 0.008a

382.67 ± 3.79a

345.23 ± 3.68a

 2.5 B

1.36 ± 0.07b

0.532 ± 0.006c

0.762 ± 0.006b

354.45 ± 2.86b

305.45 ± 2.81b

 5 B

1.37 ± 0.07b

0.541 ± 0.005b

0.758 ± 0.006b

352.34 ± 2.94b

297.67 ± 2.73b

 10 B

1.31 ± 0.06c

0.518 ± 0.003d

0.725 ± 0.005c

322.78 ± 2.76c

265.45 ± 2.49c

 20 B

1.20 ± 0.06d

0.487 ± 0.002e

0.698 ± 0.004d

286.12 ± 2.59d

233.12 ± 2.22d

 30 B

0.91 ± 0.04e

0.432 ± 0.002f

0.654 ± 0.004e

223.43 ± 2.25e

202.34 ± 2.04e

C. flexuosus

 Control

1.23 ± 0.04a

0.678 ± 0.008a

0.796 ± 0.009a

412.56 ± 4.52a

294.45 ± 3.32a

 2.5 B

1.12 ± 0.04b

0.643 ± 0.007b

0.773 ± 0.006b

389.76 ± 3.77b

256.34 ± 2.86b

 5 B

1.10 ± 0.03b

0.624 ± 0.007c

0.768 ± 0.005b

370.56 ± 3.67c

245.31 ± 2.27c

 10 B

0.97 ± 0.03c

0.621 ± 0.007c

0.729 ± 0.003c

354.70 ± 3.38d

212.34 ± 2.10d

 20 B

0.92 ± 0.03d

0.576 ± 0.006d

0.702 ± 0.002d

315.76 ± 2.90e

193.23 ± 2.00e

 30 B

0.82 ± 0.03e

0.516 ± 0.006e

0.663 ± 0.002e

278.80 ± 2.26f

165.45 ± 1.86f

  1. Data represent the mean value ± standard error from five replicates (n = 5). The different lower case letters represent statistically significant differences between treatments (p < 0.05)