Effects of shading treatments on photosynthetic characteristics of endangered plant Thuja koraiensis

doi:10.12302/j.issn.1000-2006.202012003

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (5): 58-66.doi: 10.12302/j.issn.1000-2006.202012003

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Effects of shading treatments on photosynthetic characteristics of endangered plant Thuja koraiensis

YUAN Jingqi¹^,²(), YU Zhongliang¹^,², LAN Xuehan¹, LI Chenghong¹, TIAN Nianjun³, DU Fengguo¹^,⁴^,^*()

1. College of Forestry, Beihua University, Jilin 132013, China
2. Jilin Province Academy of Forestry Science, Changchun 130033, China
3. Baishan City Academy of Forestry Science, Baishan 134300, China
4. Key Laboratory of National Forestry and Grassland Administration on Conservation and Efficient Utilization of Precious and Rare Forest Resource in Changbai Mountain, Jilin 132013, China

Received:2020-12-01 Revised:2021-03-09 Online:2022-09-30 Published:2022-10-19
Contact: DU Fengguo E-mail:1036636311@qq.com;dfg4656@qq.com

Abstract

Abstract:

【Objective】To provide scientific basis for effective conservation measures for Thuja koraiensis, the photosynthetic characteristics of endangered plant T. koraiensis were analyzed and the relationship between photosynthesis and environmental factors was discussed. 【Method】The Li-6400 portable photosynthetic system was used in the study, the photosynthetic and physiological characteristics of the 7-year-old cutting seedlings of T. koraiensis in different light environments (L0, L1, L2 and L3, shade degrees were 0%, 25%, 50% and 75%, respectively.) including light response curve,diurnal variation of photosynthesis and pigment content were analyzed, and analysis of path coefficient was carried out. 【Result】The results of light response curve fitting showed that with the increaseing of shading intensity, the maximum net photosynthetic rate, dark respiration rate, light saturation point and light compensation point decreased significantly, which indicated that T. koraiensis had a certain shade-tolerance. The results of diurnal variation curve of photosynthesis showed that with the increasing of shading intensity, the net photosynthetic rate, stomatal conductance and transpiration rate decreased, and the principal reason of the reduction in photosynthesis was attributed to non-stomatal limitation factor. The results of pigment content showed that T. koraiensis responded to the shade environment by increasing the contents of chlorophyll a, chlorophyll b, total chlorophyll and carotenoids. The results of the analysis of path coefficient showed that, air relative humidity (RH) was the main environmental factor affecting the net photosynthetic rate of diurnal variation of photosynthesis under different light environments. According to the ranking of decision coefficient, RH had the largest effet on the net photosynthetic rate in L0 and L1, and PAR had the largest in L2 and L3. 【Conclusion】T. koraiensis had better photosynthetic performance under full light and 25% shading, and had a certain shade-tolerance. However, when the shading intensity was too high, the normal growth of plants would be affected by insufficient light.

Key words: Thuja koraiensis, shading treatments, photosynthesis, pigment content, analysis of path coefficient

CLC Number:

S718
Q948

YUAN Jingqi, YU Zhongliang, LAN Xuehan, LI Chenghong, TIAN Nianjun, DU Fengguo. Effects of shading treatments on photosynthetic characteristics of endangered plant Thuja koraiensis[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2022, 46(5): 58-66.

Figures/Tables 11

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处理 treatment	A_QY/ (mol·mol^-1)	P_n,max/ (μmol·m^-2·s^-1)	R_d/ (μmol·m^-2·s^-1)	L_SP/ (μmol·m^-2·s^-1)	L_CP/ (μmol·m^-2·s^-1)	R²
L0	0.037±0.002 b	4.063±0.228 a	2.027±0.137 a	1107.164±26.407 a	72.169±1.284 a	0.995
L1	0.046±0.002 a	3.193±0.167 b	1.602±0.108 b	816.673±18.113 b	46.906±1.182 b	0.982
L2	0.036±0.002 b	3.033±0.158 b	1.123±0.072 c	814.256±16.594 b	39.403±0.804 c	0.976
L3	0.026±0.001 c	2.654±0.141 b	0.802±0.063 c	764.537±13.206 b	37.254±1.628 c	0.991

处理 treatment	P_n / (μmol·m^-2·s^-1)	P_AR/ (μmol·m^-2·s^-1)	G_s/ (mmol·m^-2·s^-1)	T_r/ (mmol·m^-2·s^-1)	C_i/ (μmol·mol^-1)	L_s
L0	2.123±0.308 a	692.011±49.894 a	0.080±0.008 a	1.699±0.121 a	303.170±8.025 b	0.171±0.021 a
L1	1.512±0.253 ab	449.549±36.895 b	0.073±0.006 a	1.513±0.093 ab	325.660±10.681 ab	0.118±0.028 ab
L2	1.368±0.237 bc	158.680±10.919 c	0.066±0.007 ab	1.333±0.098 bc	331.326±10.493 ab	0.106±0.027 ab
L3	0.708±0.205 c	63.630±4.434 d	0.053±0.005 b	1.044±0.083 c	347.084±12.635 a	0.070±0.033 b

处理 treatment	叶绿素a含量/ (mg·g^-1) Chla content	叶绿素b含量/ (mg·g^-1) Chlb content	总叶绿素含量/ (mg·g^-1) Chl a+b content	叶绿素a/b Chl a/b	类胡萝卜素含量/ (mg·g^-1) Car content	类胡萝卜素/ 总叶绿素 Car/Chl
L0	0.180±0.001 d	0.088±0.002 d	0.268±0.003 d	2.036±0.034 a	0.018±0.000 d	0.068±0.001 c
L1	0.216±0.001 c	0.103±0.001 c	0.319±0.001 c	2.110±0.003 a	0.031±0.000 a	0.097±0.001 a
L2	0.266±0.001 b	0.128±0.001 b	0.395±0.001 b	2.076±0.031 a	0.029±0.001 b	0.074±0.002 b
L3	0.296±0.001 a	0.152±0.002 a	0.448±0.002 a	1.950±0.018 b	0.022±0.001 c	0.049±0.002 d

处理 treatment	因子 factor	P_n	T_a	C_a	H_R
	T_a	0.341
L0	C_a	0.476^**	-0.566^**
	H_R	0.491^**	-0.523^**	0.921^**
	P_AR	0.197	0.952^**	-0.677^**	-0.603^**
	T_a	0.259
L1	C_a	0.352	-0.731^**
	H_R	0.464^*	-0.650^**	0.897^**
	P_AR	0.297	0.918^**	-0.622^**	-0.566^**
	T_a	0.041
L2	C_a	0.311	-0.896^**
	H_R	0.399^*	-0.823^**	0.929^**
	P_AR	0.429^*	0.837^**	-0.602^**	-0.522^**
	T_a	-0.255
L3	C_a	0.178	-0.935^**
	H_R	0.228	-0.910^**	0.929^**
	P_AR	0.391^*	0.129	-0.277	-0.375

处理 treatment	多元线性回归方程 multivariate linear regression equation	R²	F	P
L0	P_n = -70.735+0.081 H_R+0.455 T_a+0.151 C_a	0.794	29.616	<0.001
L1	P_n = -50.424+0.142 H_R+0.576 T_a+0.075 C_a	0.800	30.575	<0.001
L2	P_n = -9.951+0.019 P_AR+0.154 H_R	0.718	30.579	<0.001
L3	P_n = -4.711+0.026 P_AR+0.068 H_R	0.316	5.542	0.011

Effects of shading treatments on photosynthetic characteristics of endangered plant Thuja koraiensis

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处理 treatment	因子 factor	直接通径系数 direct path coefficient	间接通径系数indirect path coefficient					决定系数 R²
处理 treatment	因子 factor	直接通径系数 direct path coefficient	∑	T_a	C_a	H_R	P_AR	决定系数 R²
	T_a	0.899	-0.558		-0.370	-0.188		-0.195
L0	C_a	0.654	-0.178	-0.509		0.331		0.195
	H_R	0.359	0.132	-0.470	0.602			0.224
	T_a	1.101	-0.842		-0.369	-0.473		-0.642
L1	C_a	0.505	-0.153	-0.805		0.652		0.100
	H_R	0.727	-0.263	-0.716	0.453			0.146
L2	H_R	0.857	-0.458				-0.458	-0.051
	P_AR	0.877	-0.447			-0.447		-0.017
L3	H_R	0.436	-0.208				-0.208	0.009
	P_AR	0.554	-0.164			-0.164		0.126