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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.