荫蔽锻炼对大豆苗期光合特性的影响

doi:10.3724/SP.J.1006.2019.84061

Abstract

Abstract:

Shade stress limits the further increase of soybean yield in intercropping. In order to investigate the effect of shade priming on photosynthetic and chlorophyll fluorescence characteristics of soybean seedlings, the growth of plants were undergone three stages of shade priming (S1), light recovery (S2), and shade stress (S3). The shade priming included shade signal (increasing the ration of far red with LED lamp of 730 nm) and shade stress. The treatments of the experiment were natural light (LLLL), shade-signal priming (LFLS), shade-stress priming (LSLS), and no priming (LLLS). The results showed that compared with LLLS, shade priming enhanced chlorophyll a, chlorophyll b, carotenoid contents and total chlorophyll content in old and middle-age leaves significantly, while reduced chlorophyll a/b in old and young leaves. Except for the middle-age leaves of LSLS, both the net photosynthetic rate and stomatal conductance of each leaf position of LFLS and LSLS were significantly increased. And there was no significant difference in intercellular carbon dioxide concentration in old and middle-age leaves between the primed plants and the non-primed plants. Compared with the control (LLLL), F_o, q_p, NPQ, Φ_PSII, ETR decreased, while F_v/F_m and F_v'/F_m' increased. Among them, the reduction of F_o in the primed was smaller than that in the control. The trend of the reduction of q_p was LFLS > LLLS > LSLS in old leaves, while LSLS < LFLS < LLLS in middle-age leaves and LSLS > LFLS > LLLS in young leaves. Φ_PSII, ETR considerably decreased as compared with the control, but there was no significant difference between the primed plants and the non-primed plants. Compared with LLLL, the increase of F_v'/F_m' in young leaves of the primed plants was greater than that of the non-primed plants, with the increase of 6.51%, 8.79%, and 12.05% (P < 0.05) in LLLS, LFLS, and LSLS, respectively. Therefore, by shade priming at S1, soybeans adapted to the light environment through the plasticity of photosynthetic characteristics and exhibited a stronger tolerance to shade stress occurring during S3.

Key words: shade priming, soybean, photosynthetic characteristics, chlorophyll fluorescence

Yang GAO,Wei-Guo LIU,Shu-Xian LI,Ting LIU,Tao ZHOU,Yong-Li DU,Yi ZHANG,Bi-Qin LI,Wen-Yu YANG. Effect of shade priming on photosynthetic characteristics of soybean seedlings[J].Acta Agronomica Sinica, 2019, 45(1): 91-99.

Figures/Tables 4

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References 46

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处理 Treatment	第1阶段S1 (V1-V2) The first stage (V1-V2)	第2阶段S2 (V3-V5) The second stage (V3-V5)	第3阶段S3 (V6-V8) The third stage (V6-V8)
LLLL	Light	Light	Light
LLLS	Light	Light	Shade
LFLS	Shade signal	Light	Shade
LSLS	Shade	Light	Shade

叶位 Leaf position	处理 Treatment	叶绿素a含量 Chlorophyll a content (mg g^-1)	叶绿素b含量 Chlorophyll b content (mg g^-1)	叶绿素总含量Chlorophyll content (mg g^-1)	类胡萝卜素含量Carotenoid content (mg g^-1)	叶绿素a/b Chlorophyll a/b
老叶	LLLL	1.522±0.000 a	0.331±0.003 b	1.853±0.003 a	0.451±0.002 b	4.596±0.048 a
Old leaves	LLLS	1.217±0.033 b	0.278±0.004 c	1.494±0.037 c	0.400±0.008 c	4.384±0.074 a
	LFLS	1.479±0.024 a	0.380±0.018 a	1.859±0.006 a	0.507±0.018 a	3.911±0.243 b
	LSLS	1.278±0.066 b	0.366±0.018 ab	1.645±0.083 b	0.424±0.020 bc	3.487±0.040 b
成熟叶	LLLL	1.754±0.032 b	0.408±0.002 c	2.162±0.033 c	0.472±0.011 d	4.303±0.075 a
Middle-age	LLLS	1.577±0.008 c	0.466±0.001 b	2.043±0.009 d	0.503±0.004 c	3.387±0.013 b
leaves	LFLS	1.749±0.010 b	0.543±0.013 a	2.292±0.022 b	0.536±0.009 b	3.222±0.059 b
	LSLS	1.887±0.022 a	0.562±0.003 a	2.449±0.024 a	0.627±0.007 a	3.353±0.023 b
新叶	LLLL	1.901±0.033 b	0.533±0.008 b	2.434±0.039 b	0.648±0.014 b	3.570±0.045 a
Young leaves	LLLS	2.670±0.151 a	0.819±0.044 a	3.489±0.195 a	0.844±0.052 a	3.258±0.022 b
	LFLS	2.458±0.040 a	0.819±0.012 a	3.277±0.051 a	0.769±0.020 a	3.000±0.027 d
	LSLS	2.493±0.028 a	0.796±0.012 a	3.289±0.040 a	0.813±0.009 a	3.132±0.016 c

叶位 Leaf position	处理 Treatment	净光合速率 Net photosynthetic rate (P_n) (μmol CO₂ m^-2 s^-1)	气孔导度 Stomatal conductance (G_s) (mol H₂O m^-2 s^-1)	胞间二氧化碳浓度 Intercellular CO₂concentration (C_i) (μmol CO₂ mol^-1)	蒸腾速率 Transpiration rate (T_r) (mmol H₂O m^-2 s^-1)
老叶	LLLL	4.04±0.13 d	0.167±0.004 a	339.71±1.45 a	3.57±0.12 a
Old leaves	LLLS	5.13±0.11 c	0.086±0.001 d	284.76±1.08 b	1.59±0.03 d
	LFLS	6.32±0.10 a	0.122±0.007 b	289.75±4.73 b	3.16±0.13 b
	LSLS	5.71±0.03 b	0.102±0.001 c	288.90±0.49 b	2.06±0.06 c
成熟叶	LLLL	4.62±0.03 d	0.044±0.001 c	212.03±4.55 b	1.14±0.01 c
Middle-age leaves	LLLS	9.78±0.09 b	0.144±0.006 b	264.41±2.98 a	2.29±0.09 b
	LFLS	10.81±0.12 a	0.163±0.001 a	265.53±1.34 a	2.57±0.06 b
	LSLS	8.33±0.08 c	0.140±0.008 b	267.67±4.27 a	5.13±0.22 a
新叶	LLLL	13.74±0.34 a	0.147±0.008 a	213.21±10.57 a	3.34±0.05 a
Young leaves	LLLS	8.99±0.09 d	0.078±0.001 c	186.93±0.44 b	2.19±0.05 b
	LFLS	12.36±0.29 b	0.146±0.004 a	229.48±0.35 a	3.46±0.15 a
	LSLS	11.29±0.21 c	0.129±0.003 b	223.94±1.73 a	3.40±0.15 a

处理 Treatment	F_o	F_v/F_m	F_v'/F_m'	Φ_PSII	NPQ	q_p	ETR
老叶 Old leaves
LLLL	3853.0±287.1 a	0.753±0.005 b	0.515±0.019 b	0.229±0.006 a	2.049±0.291 a	0.450±0.006 a	96.32±2.43 a
LLLS	2694.0±108.3 c	0.809±0.004 a	0.593±0.012 a	0.204±0.002 b	1.960±0.097 a	0.357±0.002 b	85.68±0.64 a
LFLS	3289.5±22.8 b	0.815±0.003 a	0.605±0.001 a	0.204±0.002 b	1.892±0.059 a	0.337±0.002 b	85.47±0.85 a
LSLS	2899.3±84.0 bc	0.789±0.004 ab	0.537±0.013 b	0.209±0.001 b	2.285±0.146 a	0.391±0.001 b	87.64±0.37 a
成熟叶 Middle-age leaves
LLLL	3677.0±110.9 a	0.778±0.007 b	0.544±0.001 c	0.239±0.003 a	2.268±0.055 a	0.460±0.003 a	100.17±1.33 a
LLLS	2749.6±37.8 c	0.818±0.003 a	0.616±0.012 a	0.218±0.003 b	1.821±0.101 b	0.355±0.003 b	91.56±1.28 b
LFLS	3037.0±101.0 b	0.807±0.002 a	0.600±0.008 a	0.220±0.002 b	1.810±0.126 b	0.367±0.002 b	92.19±0.85 b
LSLS	2837.0±12.7 bc	0.811±0.001 a	0.571±0.005 b	0.213±0.002 b	2.134±0.034 a	0.373±0.002 b	89.25±0.85 a
新叶 Young leaves
LLLL	4074.3±93.8 a	0.749±0.010 b	0.512±0.012 b	0.263±0.003 a	2.292±0.261 a	0.515±0.003 a	110.60±1.46 a
LLLS	3329.3±29.9 c	0.788±0.003 a	0.545±0.012 a	0.249±0.005 b	2.141±0.098 a	0.457±0.005 b	104.44±2.06 a
LFLS	3612.3±118.6 b	0.785±0.005 a	0.557±0.010 a	0.237±0.006 b	1.933±0.035 a	0.427±0.006 b	99.40±2.48 a
LSLS	3225.3±76.9 c	0.792±0.002 a	0.573±0.004 a	0.236±0.003 b	1.855±0.033 a	0.412±0.003 b	99.12±1.28 a

Effect of shade priming on photosynthetic characteristics of soybean seedlings

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