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Table 3 Photosynthetic parameters of L. chinensis in responses to CO 2 ( C i ) under ABA and BR treatments

From: Effects of abscisic acid and brassinolide on photosynthetic characteristics of Leymus chinensis from Songnen Plain grassland in Northeast China

Treatment

A sat

CCP

Resp

V cmax

J max

V TPU

CE

[μmol m–2 s-1]

Control

31.16 ± 3.61 cd1

30.00a

18.30 ± 1.15c

33.50 ± 2.82de

140.00 ± 2.67e

22.70 ± 1.67c

0.04 ± 0.00c

ABA

27.57 ± 4.25d

30.00a

18.40 ± 1.29c

33.50 ± 2.30de

162.00 ± 2.81d

28.20 ± 1.29b

0.04 ± 0.00c

High BR

31.27 ± 2.56 cd

30.00a

17.20 ± 1.05 cd

34.10 ± 2.64d

191.00 ± 3.11c

32.70 ± 1.87a

0.04 ± 0.00c

ABA + low BR

32.06 ± 3.17c

30.00a

23.10 ± 2.00ab

37.90 ± 2.71c

199.00 ± 3.09c

27.00 ± 1.48b

0.07 ± 0.00b

ABA + medium BR

33.19 ± 3.89c

30.00a

24.60 ± 1.65a

45.20 ± 2.35b

237.00 ± 3.47b

20.40 ± 1.95d

0.13 ± 0.00ab

ABA + high BR

49.51 ± 4.06a

30.00a

25.20 ± 1.45a

51.90 ± 2.88a

262.00 ± 3.55a

25.90 ± 1.55bc

0.15 ± 0.00a

High ABA + high BR

41.93 ± 3.73b

30.00a

20.80 ± 1.82b

51.10 ± 2.63a

236.00 ± 3.17b

32.80 ± 1.73a

0.14 ± 0.00ab

  1. ABA: abscisic acid; BR: brassinolide; Asat: light-saturated rate of net photosynthesis; CCP: CO2 compensation point; Resp: respiration; Vcmax: maximum RUBP carboxylation rates; Jmax: the maximum electron transport; VTPU: maximum triose-phosphate utilization; CE: carboxylation efficiency calculated from the data of photosynthetic response to CO2. 1 : Different letters with a column indicate significate difference at P ≤ 0.05.