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

Botanical Studies

Table 2 Photosynthetic parameters of L. chinensis in response to light under ABA and BR treatments

Treatment	Q _E	A_max[μmol m^–2 s^-1]	*LCP*	*LSE*
Control	0.02 ± 0.00d¹	10.33 ± 0.93c	78.66 ±1.85a	502.80 ±10.77a
ABA	0.04 ± 0.00c	9.96 ± 0.85c	52.96 ± 1.94b	283.10 ± 9.56b
High BR	0.07 ± 0.00b	13.26 ± 0.67bc	52.28 ± 1.25b	255.20 ± 8.74b
ABA + low BR	0.06 ± 0.00b	13.88 ± 0.53bc	54.21 ± 1.68b	295.80 ± 10.65b
ABA + medium BR	0.07 ± 0.00b	13.64 ± 0.78bc	45.08 ± 1.34c	548.40 ± 11.28a
ABA + high BR	0.11 ± 0.00a	16.86 ± 0.91a	25.07 ± 1.25d	175.70 ± 10.34c
High ABA + high BR	0.11 ± 0.00a	14.14 ± 0.94b	24.58 ± 0.99d	157.00 ± 10.26c

(ABA: abscisic acid; BR: brassinolide; Q_E: high energy state quenching; A_max:the maximum net photosynthesis; LCP: light compensation point; LSE: light saturation estimate. ¹ : Different letters with a column indicate significate difference at P ≤ 0.05 ).