Relative changes and regulation of photosynthetic energy partitioning components in Artemisia ordosica during growing season

doi:10.17521/cjpe.2021.0146

Abstract

Abstract:

Aims This study is to examine the relative changes and regulation in photosynthetic energy partitioning components of a typical desert shrub Artemisia ordosica in Northwest China.
Methods The minimum fluorescence yield (F_o), maximal fluorescence yield (F_m), actual ﬂuorescence yield (F_s), maximal fluorescence yield in the light-adapted state (F_m′), net photosynthetic rate (P_n), dark respiration (R_d), transpiration rate (E) and stomatal conductance (g_s) of A. ordosica were investigated from April to October, 2018 using a multi-channel fluorometer and a portable photosynthesis analyzer. The specific leaf area (SLA), nitrogen per leaf area (N_area), chlorophyll content (C_Chl) and the ratio of chlorophyll a to chlorophyll b content (Chl a/b) were also measured. We analyzed the fraction of energy used for CO₂ assimilation (Φ_A), the fraction of energy used for photorespiration (Φ_PR), the fraction of regulate heat dissipation (Φ_NPQ) and the fraction of non-regulate heat dissipation in energy allocation (Φ_NO) during the photosynthetic process in A. ordosica and their responses to fluctuating environment.
Important findings The photochemical reaction component (Φ_A and Φ_PR) and the heat dissipation component (Φ_NPQ and Φ_NO) showed a negative competition relationship, and exhibited positive synergistic relationship within components. E was positively correlated with Φ_A and Φ_PR, and negatively correlated with Φ_NPQ and Φ_NO. Under low soil water content (SWC) and high saturated water vapor pressure (VPD) conditions, Φ_A, Φ_PR and SLA were significantly decreased, while Φ_NPQ and Φ_NO were significantly increased. The results indicate that A. ordosica avoids excessive loss of water under the condition of the long drought or high evapotranspiration via reducing SLA. Synergistically, excessive light energy is transferred from photorespiration to thermal dissipation pathway. The relative changes and long-term regulation of photosynthetic energy partitioning in A. ordosica under fluctuating environment, fully reflect the acclimation of plants to adversity via its synergistic morphologic and physiological plasticity.

Key words: desert plant, photosynthesis, energy partitioning, photorespiration, heat dissipation

JIN Chuan, LI Xin-Hao, JIANG Yan, XU Ming-Ze, TIAN Yun, LIU Peng, JIA Xin, ZHA Tian- Shan. Relative changes and regulation of photosynthetic energy partitioning components in Artemisia ordosica during growing season[J]. Chin J Plant Ecol, 2021, 45(8): 870-879.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2021.0146

https://www.plant-ecology.com/EN/Y2021/V45/I8/870

Figures/Tables 5

References 34

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	Φ_A	Φ_PR	Φ_NPQ	Φ_NO	PAR	T_a	VPD	SWC	F_v/F_m	E	g_s	N_area	SLA	C_Chl	Chl a/b
Φ_A	1.000 0
Φ_PR	0.995 0^**	1.000 0
Φ_NPQ	-0.921 6^**	-0.916 6^**	1.000 0
Φ_NO	-0.960 8^**	-0.966 7^**	0.785 9^**	1.000 0
PAR	-0.194 7	-0.214 2	0.170 1	0.214 8	1.000 0
T_a	-0.231 2	-0.224 3	0.199 6	0.225 0	0.540 2^**	1.000 0
VPD	-0.114 8	-0.053 7	0.110 6	0.043 6	0.706 3^*	0.341 5	1.000 0
SWC	0.361 7	0.426 4	-0.347 9	-0.407 8	-0.506 8	-0.097 9	-0.526 0	1.000 0
F_v/F_m	0.058 9	0.099 8	-0.006 6	-0.131 3	-0.038 3	0.030 1	-0.252 6	0.251 5	1.000 0
E	0.619 5^**	0.634 5^**	-0.521 1^*	-0.647 0^**	0.185 0	0.339 0	0.184 4	0.176 1	-0.339 2	1.000 0
g_s	0.225 7	0.271 4	-0.225 4	-0.254 6	-0.205 3	-0.419 4	-0.206 4	0.221 9	0.414 5^*	0.130 5	1.000 0
N_area	0.105 1	0.014 8	-0.109 4	0.001 5	0.132 2	-0.271 7	0.583 3^*	-0.646 3^*	-0.294 9	-0.144 6	-0.035 5	1.000 0
SLA	-0.192 1	-0.127 2	0.057 8	0.195 9	-0.306 8	-0.055 1	-0.586 3^*	0.569 2^*	0.438 9	-0.101 8	0.389 7	-0.530 6	1.000 0
C_Chl	-0.266 9	-0.242 1	0.254 8	0.226 0	0.612 1^*	0.423 2	0.345 0	-0.133 7	0.445 8	0.164 9	0.290 9	-0.120 4	-0.041 4	1.000 0
Chl a/b	-0.030 8	-0.066 9	0.168 9	-0.024 8	0.171 5	-0.106 6	0.197 2	-0.144 8	-0.112 6	0.034 8	0.065 3	0.444 5	-0.004 7	0.251 4	1.000 0

	Φ_A	Φ_PR	Φ_NPQ	Φ_NO	PAR	T_a	VPD	SWC	F_v/F_m	E	g_s	N_area	SLA	C_Chl	Chl a/b
Φ_A	1.000 0
Φ_PR	0.995 0^**	1.000 0
Φ_NPQ	-0.921 6^**	-0.916 6^**	1.000 0
Φ_NO	-0.960 8^**	-0.966 7^**	0.785 9^**	1.000 0
PAR	-0.194 7	-0.214 2	0.170 1	0.214 8	1.000 0
T_a	-0.231 2	-0.224 3	0.199 6	0.225 0	0.540 2^**	1.000 0
VPD	-0.114 8	-0.053 7	0.110 6	0.043 6	0.706 3^*	0.341 5	1.000 0
SWC	0.361 7	0.426 4	-0.347 9	-0.407 8	-0.506 8	-0.097 9	-0.526 0	1.000 0
F_v/F_m	0.058 9	0.099 8	-0.006 6	-0.131 3	-0.038 3	0.030 1	-0.252 6	0.251 5	1.000 0
E	0.619 5^**	0.634 5^**	-0.521 1^*	-0.647 0^**	0.185 0	0.339 0	0.184 4	0.176 1	-0.339 2	1.000 0
g_s	0.225 7	0.271 4	-0.225 4	-0.254 6	-0.205 3	-0.419 4	-0.206 4	0.221 9	0.414 5^*	0.130 5	1.000 0
N_area	0.105 1	0.014 8	-0.109 4	0.001 5	0.132 2	-0.271 7	0.583 3^*	-0.646 3^*	-0.294 9	-0.144 6	-0.035 5	1.000 0
SLA	-0.192 1	-0.127 2	0.057 8	0.195 9	-0.306 8	-0.055 1	-0.586 3^*	0.569 2^*	0.438 9	-0.101 8	0.389 7	-0.530 6	1.000 0
C_Chl	-0.266 9	-0.242 1	0.254 8	0.226 0	0.612 1^*	0.423 2	0.345 0	-0.133 7	0.445 8	0.164 9	0.290 9	-0.120 4	-0.041 4	1.000 0
Chl a/b	-0.030 8	-0.066 9	0.168 9	-0.024 8	0.171 5	-0.106 6	0.197 2	-0.144 8	-0.112 6	0.034 8	0.065 3	0.444 5	-0.004 7	0.251 4	1.000 0

	E	g_s	N_area	SLA	C_Chl	Chl a/b	Y	SSE	R²	p	AIC
Φ_A	0.000 8 (0.001 2)	0.018 9 (0.051 5)	0.069 1 (0.033 8)	0.001 9 (0.000 7)	0.0347 (0.056 1)	0.004 2 (0.010 1)	0.075 3 (0.168 3)	0.000 3	0.57	0.29	-50.72
Φ_PR	0.001 5 (0.336 7)	0.050 5 (0.103 0)	0.001 1 (0.067 6)	0.000 3 (0.001 3)	0.069 3 (0.112 2)	0.008 5 (0.020 8)	0.150 7 (0.336 7)	0.001 3	0.58	0.26	-42.29
Φ_NPQ	-0.000 9 (0.001 8)	-0.014 9 (0.078 8)	-0.049 3 (0.051 7)	-0.001 1 (0.001 0)	-0.007 4 (0.085 9)	-0.007 3 (0.015 9)	0.572 9 (0.257 6)	0.000 8	0.59	0.25	-45.54
Φ_NO	-0.001 4 (0.002 1)	-0.084 4 (0.093 7)	-0.041 2 (0.061 5)	-0.000 5 (0.001 2)	-0.111 5 (0.102 1)	-0.020 1 (0.018 9)	0.200 9 (0.306 3)	0.001 1	0.69	0.11	-43.44

	E	g_s	N_area	SLA	C_Chl	Chl a/b	Y	SSE	R²	p	AIC
Φ_A	0.000 8 (0.001 2)	0.018 9 (0.051 5)	0.069 1 (0.033 8)	0.001 9 (0.000 7)	0.0347 (0.056 1)	0.004 2 (0.010 1)	0.075 3 (0.168 3)	0.000 3	0.57	0.29	-50.72
Φ_PR	0.001 5 (0.336 7)	0.050 5 (0.103 0)	0.001 1 (0.067 6)	0.000 3 (0.001 3)	0.069 3 (0.112 2)	0.008 5 (0.020 8)	0.150 7 (0.336 7)	0.001 3	0.58	0.26	-42.29
Φ_NPQ	-0.000 9 (0.001 8)	-0.014 9 (0.078 8)	-0.049 3 (0.051 7)	-0.001 1 (0.001 0)	-0.007 4 (0.085 9)	-0.007 3 (0.015 9)	0.572 9 (0.257 6)	0.000 8	0.59	0.25	-45.54
Φ_NO	-0.001 4 (0.002 1)	-0.084 4 (0.093 7)	-0.041 2 (0.061 5)	-0.000 5 (0.001 2)	-0.111 5 (0.102 1)	-0.020 1 (0.018 9)	0.200 9 (0.306 3)	0.001 1	0.69	0.11	-43.44